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8E - 2    INSTRUMENT PANEL SYSTEMS                                                                             XJGENERAL I...
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8E - 10    INSTRUMENT PANEL SYSTEMS                                                                           XJDIAGNOSIS ...
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8E - 12      INSTRUMENT PANEL SYSTEMS                                                                                     ...
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Exj 8 e

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Exj 8 e

  1. 1. XJ INSTRUMENT PANEL SYSTEMS 8E - 1 INSTRUMENT PANEL SYSTEMS CONTENTS page pageGENERAL INFORMATION CLUSTER ILLUMINATION LAMP . . . . . . . . . . . 17 GAUGE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 COOLANT TEMPERATURE GAUGE . . . . . . . . . 10 INDICATOR LAMP . . . . . . . . . . . . . . . . . . . . . . . 3 COOLANT TEMPERATURE WARNING LAMP . . 18 INSTRUMENT CLUSTER . . . . . . . . . . . . . . . . . . 2 CRUISE-ON INDICATOR LAMP . . . . . . . . . . . . 18 INSTRUMENT PANEL . . . . . . . . . . . . . . . . . . . . 2 FOUR-WHEEL DRIVE INDICATOR LAMP . . . . . 18 INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . 1 FUEL GAUGE . . . . . . . . . . . . . . . . . . . . . . . . . 13 JUNCTION BLOCK . . . . . . . . . . . . . . . . . . . . . . 3 HEADLAMP HIGH BEAM INDICATOR LAMP . . 19DESCRIPTION AND OPERATION INSTRUMENT CLUSTER . . . . . . . . . . . . . . . . . . 9 AIRBAG INDICATOR LAMP . . . . . . . . . . . . . . . . 6 LOW FUEL WARNING LAMP . . . . . . . . . . . . . . 20 ANTI-LOCK BRAKE SYSTEM LAMP . . . . . . . . . . 6 LOW OIL PRESSURE WARNING LAMP . . . . . . 20 BRAKE WARNING LAMP . . . . . . . . . . . . . . . . . . 6 LOW WASHER FLUID WARNING LAMP . . . . . . 20 CHECK GAUGES LAMP . . . . . . . . . . . . . . . . . . . 6 MALFUNCTION INDICATOR LAMP . . . . . . . . . . 21 CIGAR LIGHTER AND POWER OUTLET . . . . . . 6 ODOMETER AND TRIP ODOMETER . . . . . . . . 13 CIGAR LIGHTER RELAY . . . . . . . . . . . . . . . . . . 6 OIL PRESSURE GAUGE . . . . . . . . . . . . . . . . . 13 CLUSTER ILLUMINATION LAMP . . . . . . . . . . . . 7 SEAT BELT REMINDER LAMP . . . . . . . . . . . . . 21 COOLANT TEMPERATURE GAUGE . . . . . . . . . . 4 SPEEDOMETER . . . . . . . . . . . . . . . . . . . . . . . 14 COOLANT TEMPERATURE WARNING LAMP . . 7 TACHOMETER . . . . . . . . . . . . . . . . . . . . . . . . . 14 CRUISE-ON INDICATOR LAMP . . . . . . . . . . . . . 7 TURN SIGNAL INDICATOR LAMP . . . . . . . . . . 21 FOUR-WHEEL DRIVE INDICATOR LAMP . . . . . . 7 UPSHIFT INDICATOR LAMP . . . . . . . . . . . . . . 22 FUEL GAUGE . . . . . . . . . . . . . . . . . . . . . . . . . . 4 VOLTAGE WARNING LAMP . . . . . . . . . . . . . . . 22 HEADLAMP HIGH BEAM INDICATOR LAMP . . . 7 VOLTMETER . . . . . . . . . . . . . . . . . . . . . . . . . . 14 LOW FUEL WARNING LAMP . . . . . . . . . . . . . . . 8 REMOVAL AND INSTALLATION LOW OIL PRESSURE WARNING LAMP . . . . . . . 8 ACCESSORY SWITCH BEZEL . . . . . . . . . . . . . 24 LOW WASHER FLUID WARNING LAMP . . . . . . . 8 CENTER SUPPORT BRACKET . . . . . . . . . . . . 32 MALFUNCTION INDICATOR LAMP . . . . . . . . . . 8 CIGAR LIGHTER RELAY . . . . . . . . . . . . . . . . . 24 ODOMETER AND TRIP ODOMETER . . . . . . . . . 4 CLUSTER BEZEL . . . . . . . . . . . . . . . . . . . . . . . 25 OIL PRESSURE GAUGE . . . . . . . . . . . . . . . . . . 5 CLUSTER BULB . . . . . . . . . . . . . . . . . . . . . . . . 28 SEAT BELT REMINDER LAMP . . . . . . . . . . . . . . 9 CLUSTER COMPONENTS . . . . . . . . . . . . . . . . 27 SPEEDOMETER . . . . . . . . . . . . . . . . . . . . . . . . 5 GLOVE BOX COMPONENTS . . . . . . . . . . . . . . 30 TACHOMETER . . . . . . . . . . . . . . . . . . . . . . . . . . 5 GLOVE BOX LAMP AND SWITCH . . . . . . . . . . 29 TURN SIGNAL INDICATOR LAMP . . . . . . . . . . . 9 GLOVE BOX LATCH STRIKER . . . . . . . . . . . . . 31 UPSHIFT INDICATOR LAMP . . . . . . . . . . . . . . . 9 GLOVE BOX . . . . . . . . . . . . . . . . . . . . . . . . . . 29 VOLTAGE WARNING LAMP . . . . . . . . . . . . . . . . 9 HEADLAMP SWITCH . . . . . . . . . . . . . . . . . . . . 25 VOLTMETER . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 INSTRUMENT CLUSTER . . . . . . . . . . . . . . . . . 26DIAGNOSIS AND TESTING INSTRUMENT PANEL ASSEMBLY . . . . . . . . . . 33 AIRBAG INDICATOR LAMP . . . . . . . . . . . . . . . 14 INSTRUMENT PANEL CENTER BEZEL . . . . . . 23 ANTI-LOCK BRAKE SYSTEM LAMP . . . . . . . . . 14 INSTRUMENT PANEL END CAP . . . . . . . . . . . 31 BRAKE WARNING LAMP . . . . . . . . . . . . . . . . . 15 INSTRUMENT PANEL TOP COVER . . . . . . . . . 28 CHECK GAUGES LAMP . . . . . . . . . . . . . . . . . . 16 JUNCTION BLOCK . . . . . . . . . . . . . . . . . . . . . . 32 CIGAR LIGHTER AND POWER OUTLET . . . . . 16 KNEE BLOCKER . . . . . . . . . . . . . . . . . . . . . . . 23 CIGAR LIGHTER RELAY . . . . . . . . . . . . . . . . . 16 STEERING COLUMN OPENING COVER . . . . . 22GENERAL INFORMATION is a very complex unit. The instrument panel is designed to house the controls and monitors for stan-INTRODUCTION dard and optional powertrains, climate control sys- This group is responsible for covering the vehicle tems, audio systems, lighting systems, safetyinstrument panel. However, because the instrument systems, and many other comfort or conveniencepanel serves as the command center of the vehicle, it items. It is also designed so that all of the controls and monitors can be safely reached and viewed by
  2. 2. 8E - 2 INSTRUMENT PANEL SYSTEMS XJGENERAL INFORMATION (Continued)the vehicle operator, while still allowing relative ease tioning system panel outlets, which greatly reducesof access to these items for service. the number of components used over conventional Complete service information coverage for all of the instrument panel construction.systems and components housed in the instrument Modular instrument panel construction allows allpanel in this section of the service manual would not of the gauges and controls to be serviced from thebe practical. It would result in a great deal of dupli- front of the panel. In addition, most of the instru-cation and make this group too large for the informa- ment panel electrical components can be accessedtion to be easily accessed and used. Therefore, the without complete instrument panel removal. If neces-information found in this group has been limited as sary, the instrument panel can be removed from thefollows: vehicle as an assembly. • General Information - Covers non-electrical com- Removal of the steering column opening cover andponents and features of the instrument panel that knee blocker provides access to the steering columnare not related to other systems. mounts, the steering column wiring, the headlamp • Description and Operation - Covers gauges and switch, the electronic combination flasher, and muchtheir sending units, warning lamps and their of the instrument panel wiring. Removal of the gloveswitches, and instrument panel illumination lamps. box provides access to the heating and air condition- • Diagnosis and Testing - Covers gauges and their ing electrical and vacuum harnesses, the blowersending units, warning lamps and their switches, motor relay, the radio antenna coaxial cable, theand instrument panel illumination lamps. lower passenger side airbag mounts, and additional • Removal and Installation - Covers components instrument panel wiring.installed on or in the instrument panel that require Removal of the instrument panel center bezelremoval for diagnosis or service of instrument panel allows access to the radio, the heating and air condi-components covered in this group. tioning controls, the accessory switches, the cigar For more information on components or systems lighter, and the accessory power outlet. Removal ofnot covered above, refer to the proper group in this the instrument cluster bezel allows access to themanual. If you are uncertain as to the proper group, instrument cluster. Removal of the cluster assemblyrefer to the Component and System Index at the allows access to the cluster illumination and indica-back of this manual. Refer to Group 8W - Wiring tor lamp bulbs, and more of the instrument panelDiagrams for complete circuit descriptions and dia- wiring.grams. Removal of the instrument panel top cover allows access to the upper passenger side airbag mounts.NOTE: This group covers both Left-Hand Drive Instrument panel removal is required for service of(LHD) and Right-Hand Drive (RHD) versions of this most internal components of the heating and air con-model. Whenever required and feasible, the RHD ditioning housing.versions of affected vehicle components have beenconstructed as mirror-image of the LHD versions. INSTRUMENT CLUSTERWhile most of the illustrations used in this group Two basic instrument clusters are offered on thisrepresent only the LHD version, the diagnostic and model: low-line or high-line. Both clusters are electro-service procedures outlined can generally be mechanical units that utilize integrated circuitry andapplied to either version. Exceptions to this rule information carried on the Chrysler Collision Detec-have been clearly identified as LHD or RHD, if a tion (CCD) data bus network for control of all gaugesspecial illustration or procedure is required. and many of the indicator lamps. These clusters also incorporate a vacuum fluorescent display tube for the digital odometer/trip odometer display functions.INSTRUMENT PANEL Some variations of each cluster exist due to optional This instrument panel uses a full-width structural equipment and regulatory requirements.plastic foundation as its primary support. When the The low-line cluster includes the following analogtwo primary molded plastic components of this struc- gauges:ture are vibration welded together they provide supe- • Fuel gaugerior instrument panel stiffness and integrity to help • Speedometer.reduce buzzes, squeaks, and rattles even on the This cluster includes provisions for the followingbumpiest roads. indicator lamps: This type of construction also provides improved • Airbag indicator lampenergy absorption which, in conjunction with the • Anti-lock brake system lampdual airbag modules and seat belts, helps to improve • Brake warning lampoccupant protection. This foundation structure also • Coolant temperature warning lampserves as the ducting for the heating and air condi-
  3. 3. XJ INSTRUMENT PANEL SYSTEMS 8E - 3GENERAL INFORMATION (Continued) • Cruise-on indicator lamp indicate any vehicle condition unless the ignition • Four-wheel drive (Part Time and/or Full Time) switch is in the On or Start positions.indicator lamps All gauges, except the odometer, are air core mag- • Headlamp high beam indicator lamp netic units. Two fixed electromagnetic coils are • Low oil pressure warning lamp located within the gauge. These coils are wrapped at • Low washer fluid warning lamp right angles to each other around a movable perma- • Malfunction indicator (Check Engine) lamp nent magnet. The movable magnet is suspended • Seat belt reminder lamp within the coils on one end of a shaft. The gauge nee- • Turn signal indicator lamps dle is attached to the other end of the shaft. • Upshift indicator lamp (manual transmission) One of the coils has a fixed current flowing • Voltage warning lamp. through it to maintain a constant magnetic field The high-line cluster replaces some of the indicator strength. Current flow through the second coillamps found in the low-line cluster with analog changes, which causes changes in its magnetic fieldgauges. The high-line cluster includes the following strength. The current flowing through the second coilanalog gauges: is changed by the instrument cluster electronic cir- • Coolant temperature gauge cuitry in response to messages received on the • Fuel gauge Chrysler Collision Detection (CCD) data bus network. • Oil pressure gauge The gauge needle moves as the movable permanent • Speedometer magnet aligns itself to the changing magnetic fields • Tachometer created around it by the electromagnets. The instru- • Voltmeter. ment cluster circuitry is programmed to move all of The high-line cluster also adds a check gauges the gauge needles back to the low end of their respec-lamp and a low fuel warning lamp to the remaining tive scales after the ignition switch is turned to theindicator lamps found in the low-line cluster. Off position. Both instrument clusters feature circuitry that hasa self-diagnostic actuator test capability, which will INDICATOR LAMPtest each of the CCD bus message-controlled func- Indicator lamps are located in the instrument clus-tions of the cluster by lighting the appropriate indi- ter and are served by the cluster circuit board andcator lamps and positioning the gauge needles at connectors. Many of the indicator lamps in theseveral predetermined locations on the gauge faces in instrument cluster are controlled by the instrumenta prescribed sequence. For more information on this cluster circuitry in response to messages receivedfunction, see Instrument Cluster in the Diagnosis over the Chrysler Collision Detection (CCD) data busand Testing section of this group. network. The instrument cluster circuitry also integrates a The anti-lock brake system lamp, brake warningchime tone generator and a timer circuit. These lamp, four-wheel drive indicator lamps, headlampitems replace the chime or buzzer module, and the high beam indicator lamp, low washer fluid warningseparate timer circuit for the rear window defogger lamp, seat belt reminder lamp driver seat belt switchsystem. Refer to Group 8U - Chime/Buzzer Warning input, and turn signal indicator lamps are hard-Systems or Group 8N - Electrically Heated Systems wired. The instrument cluster circuitry uses CCDfor more information on these cluster circuitry func- data bus messages from the Powertrain Control Mod-tions. ule (PCM) and Airbag Control Module (ACM) to con- The instrument clusters for this model are serviced trol all of the remaining indicator lamps.only as complete units. If a cluster gauge or the clus-ter circuit board are faulty, the entire cluster must be JUNCTION BLOCKreplaced. The cluster lens, the hood and mask, the The junction block is mounted on the right cowlrear housing cover and the odometer reset knob boot side inner panel under the instrument panel. It isare available for service. Also, the individual cluster concealed behind the right cowl side trim panel. Thelamp bulbs and bulb holders can be serviced. junction block serves to simplify and centralize numerous electrical components.GAUGE The junction block combines the functions previ- With the ignition switch in the On or Start posi- ously provided by a separate fuseblock module andtions, voltage is supplied to all gauges through the relay center. It contains fuses, circuit breakers andinstrument cluster electronic circuit board. With the relays. It also eliminates the need for numerousignition switch in the Off position, voltage is not sup- splice connections and serves in place of a bulkheadplied to the gauges. The gauges do not accurately connector between many of the engine compartment, instrument panel, and body wire harnesses.
  4. 4. 8E - 4 INSTRUMENT PANEL SYSTEMS XJGENERAL INFORMATION (Continued) The right cowl side trim panel has a snap-fit fuse indicates that the fuel level is below one-eighth of aaccess cover that can be removed for service of the full tank, the instrument cluster circuitry turns onjunction block fuses. A fuse puller and spare fuse the low fuel warning lamp and generates a singleholders are located on the back of the fuse access chime tone.panel. The right cowl side trim panel must be The fuel gauge sending unit is mounted to the elec-removed to access the relays in the junction block. tric fuel pump module located inside the fuel tank. The junction block cannot be repaired and, if faulty The sending unit has a float attached to the end of aor damaged, it must be replaced. swing-arm. The float moves up or down within the fuel tank as the fuel level changes. As the float moves, an electrical contact on the pivot end of theDESCRIPTION AND OPERATION swing-arm wipes across a resistor coil, which changes the internal electrical resistance of the sending unit.COOLANT TEMPERATURE GAUGE Refer to Group 14 - Fuel Systems for more informa- The coolant temperature gauge gives an indication tion on the PCM and the fuel gauge sending unit ser-of the engine coolant temperature. The instrument vice procedures.cluster circuitry controls the gauge pointer position.The instrument cluster circuitry calculates the ODOMETER AND TRIP ODOMETERproper gauge pointer position based upon an engine The odometer and the trip odometer share thecoolant temperature message received from the Pow- same vacuum fluorescent digital display tube in theertrain Control Module (PCM) on the Chrysler Colli- instrument cluster circuit board. Each gives an indi-sion Detection (CCD) data bus. cation of the distance the vehicle has travelled. How- The PCM uses an input from the engine coolant ever, by depressing the reset knob on the face of thetemperature sensor and internal programming to instrument cluster, the display can be switched fromdecide what engine coolant temperature message is odometer to trip odometer. Depressing the reset knobrequired. The PCM then sends the proper message to for longer than two seconds while in the trip odome-the instrument cluster on the CCD data bus. ter mode will reset the trip odometer to zero. The If the PCM message indicates that coolant temper- odometer and trip odometer display values are basedature is high, the instrument cluster circuitry moves on distance pulse messages received from the Power-the gauge needle into the beginning of the red zone train Control Module (PCM) on the Chrysler Colli-on the gauge face, turns on the Check Gauges lamp, sion Detection (CCD) data bus.and generates a single chime tone. If the PCM mes- The PCM uses an input from the Vehicle Speedsage indicates that coolant temperature is critical, Sensor (VSS) and internal programming to decidethe instrument cluster circuitry moves the gauge what distance pulse signal is required. The PCMneedle to the stop at the end of the red zone on the then sends the proper message to the instrumentgauge face. cluster circuitry on the CCD data bus. The instru- The engine coolant temperature sensor is installed ment cluster stores both the odometer and trip odom-in a threaded hole that penetrates a coolant passage eter distance information and displays the properof the engine. It is a thermistor-type sensor that value based upon ignition key-on and trip odometerchanges its internal resistance with changes in reset knob inputs. The instrument cluster also storesengine coolant temperature. Refer to Group 14 - Fuel the odometer display mode (odometer or trip odome-Systems for more information on the PCM and the ter), and will return to the mode that was selectedcoolant temperature sensor. prior to the ignition switch being turned off. If the instrument cluster is not receiving distanceFUEL GAUGE information on the CCD data bus when the ignition The fuel gauge gives an indication of the level of switch is turned to the On position, the odometer dis-fuel in the fuel tank. The instrument cluster circuitry play will remain blank. If the instrument clustercontrols the gauge pointer position. The instrument does not receive a distance message on the CCD datacluster circuitry calculates the proper gauge pointer bus after the ignition switch has been turned to theposition based upon a fuel level message received On position, the instrument panel circuitry willfrom the Powertrain Control Module (PCM) on the insert the last normally displayed distance in theChrysler Collision Detection (CCD) data bus. odometer display. If the instrument cluster is receiv- The PCM uses an input from the fuel gauge send- ing CCD messages, but cannot display odometer val-ing unit and internal programming to decide what ues due to an internal error, the odometer displayfuel level message is required. The PCM then sends will be blank.the proper message to the instrument cluster on the The VSS is a hall-effect sensor that is installed inCCD data bus. If the vehicle is equipped with the the transmission (two-wheel drive) or transfer casehigh-line instrument cluster, when the PCM message
  5. 5. XJ INSTRUMENT PANEL SYSTEMS 8E - 5DESCRIPTION AND OPERATION (Continued)(four-wheel drive), and is driven by the output shaft through a speedometer pinion gear. Incorrect tirethrough a speedometer pinion gear. Incorrect tire size, incorrect axle ratio, a faulty or incorrect speed-size, incorrect axle ratio, a faulty or incorrect speed- ometer pinion gear, or a faulty VSS can each resultometer pinion gear, or a faulty VSS can each result in inaccurate speedometer readings. Refer to Groupin inaccurate odometer readings. Refer to Group 14 - 14 - Fuel Systems for more information on the PCMFuel Systems for more information on the PCM and and the VSS. Refer to Group 21 - Transmission forthe VSS. Refer to Group 21 - Transmission for more more information on the speedometer pinion gear.information on the speedometer pinion gear. The odometer and trip odometer can also be used TACHOMETERto digitally display a stored DTC. Refer to Group 25 - The tachometer gives an indication of the engineEmission Control Systems for more information on speed in revolutions-per-minute (RPM). The instru-DTCs and their retrieval. ment cluster circuitry controls the gauge pointer position. The instrument cluster circuitry calculatesOIL PRESSURE GAUGE the proper gauge pointer position based upon an The oil pressure gauge gives an indication of the engine speed message received from the Powertrainengine oil pressure. The instrument cluster circuitry Control Module (PCM) on the Chrysler Collisioncontrols the gauge pointer position. The instrument Detection (CCD) data bus.cluster circuitry calculates the proper gauge pointer The PCM uses an input from the crankshaft posi-position based upon an engine oil pressure message tion sensor and internal programming to calculatereceived from the Powertrain Control Module (PCM) what engine speed message is required. The PCMon the Chrysler Collision Detection (CCD) data bus. then sends the proper message to the instrument The PCM uses an input from the engine oil pres- cluster on the CCD data bus. The crankshaft positionsure sensor and internal programming to decide sensor is a hall-effect sensor installed near the rearwhat engine oil pressure message is required. The of the engine, where it is aimed at the trigger wheelPCM then sends the proper message to the instru- attached to the rear flange of the crankshaft.ment cluster on the CCD data bus. If the PCM mes- Refer to Group 14 - Fuel Systems for more infor-sage indicates that oil pressure is low, the mation on the PCM. Refer to Group 8D - Ignitioninstrument cluster circuitry moves the gauge needle Systems for more information on the crankshaft posi-to below the zero graduation on the gauge face, and tion sensor.turns on the Check Gauges lamp. The engine oil pressure sensor is installed in a VOLTMETERthreaded hole that penetrates an oil passage of the The voltmeter gives an indication of the electricalengine. The engine oil pressure sensor contains a system voltage. The instrument cluster circuitry con-flexible diaphragm and a variable resistor coil. The trols the gauge pointer position. The instrument clus-diaphragm moves in response to changes in the ter circuitry calculates the proper gauge pointerengine oil pressure, which changes the internal elec- position based upon a system voltage messagetrical resistance of the sensor. Refer to Group 14 - received from the Powertrain Control Module (PCM)Fuel Systems for more information on the PCM and on the Chrysler Collision Detection (CCD) data bus.the engine oil pressure sensor. The PCM uses an input from the electrical system and internal programming to decide what systemSPEEDOMETER voltage message is required. The PCM then sends The speedometer gives an indication of the current the proper message to the instrument cluster on thevehicle speed. The instrument cluster circuitry con- CCD data bus.trols the gauge pointer position. The instrument clus- If the PCM message indicates that the chargingter circuitry calculates the proper gauge pointer system has failed, the instrument cluster circuitryposition based upon a vehicle speed message received moves the gauge needle to the 9 volt graduation onfrom the Powertrain Control Module (PCM) on the the gauge face, and turns on the Check Gauges lamp.Chrysler Collision Detection (CCD) data bus. If the PCM message indicates that system voltage is The PCM uses an input from the Vehicle Speed high, the instrument cluster circuitry moves theSensor (VSS) and internal programming to decide gauge needle to the 19 volt graduation on the gaugewhat vehicle speed message is required. The PCM face, and turns on the Check Gauges lamp.then sends the proper message to the instrument Refer to Group 14 - Fuel Systems for more infor-cluster on the CCD data bus. mation on the PCM. Refer to Group 8C - Charging The VSS is a hall-effect sensor that is installed in Systems for more information on charging systemthe transmission (two-wheel drive) or transfer case components and diagnosis.(four-wheel drive), and is driven by the output shaft
  6. 6. 8E - 6 INSTRUMENT PANEL SYSTEMS XJDESCRIPTION AND OPERATION (Continued)AIRBAG INDICATOR LAMP tion switch is in the Start position as a bulb test. The airbag indicator lamp gives an indication when After the bulb test, the lamp is controlled by hard-the airbag system is faulty or inoperative. The lamp wired inputs from the parking brake switch and/oris turned on by the instrument cluster circuitry for the brake warning switch.about seven seconds when the ignition switch is The brake warning switch closes to ground when itturned to the On position as a bulb test. After the senses unequal hydraulic pressures in the two halvesbulb test, the lamp is controlled by the instrument of the split brake hydraulic system, possibly due tocluster circuitry based upon a message received from low brake fluid level or brake fluid leakage. Thethe Airbag Control Module (ACM) on the Chrysler parking brake switch closes to ground when theCollision Detection (CCD) data bus. parking brake is applied. Refer to Group 5 - Brakes The ACM continually monitors the airbag system for more information.circuits and sensors to decide whether the system isin good operating condition. The ACM then sends the CHECK GAUGES LAMPproper message to the instrument cluster on the The check gauges lamp gives an indication whenCCD data bus to turn the lamp on or off. If the ACM certain gauges reflect a condition requiring immedi-sends a lamp-on message after the bulb test, it indi- ate attention. The lamp is turned on by the instru-cates that the ACM has detected a system malfunc- ment cluster circuitry for about three seconds aftertion and/or that the airbag system has become the ignition switch is turned to the On position as ainoperative. bulb test. After the bulb test, the lamp is controlled Each time the instrument cluster circuitry receives by the instrument cluster circuitry based upon gaugea lamp-on message from the ACM, it will light the data messages received from the Powertrain Controllamp for twelve seconds or the duration of the airbag Module (PCM) on the Chrysler Collision Detectionsystem malfunction, whichever is longer. If the (CCD) data bus.instrument cluster receives no lamp messages from The PCM uses several inputs to decide what gaugethe ACM for more than five seconds, it will light the data messages are required. The PCM then sends thelamp for twelve seconds or until another lamp-off proper message to the instrument cluster on themessage from the ACM, whichever is longer. CCD data bus. The gauge data messages for which Refer to Group 8M - Passive Restraint Systems for the instrument cluster is programmed to turn on themore information on the airbag system. check gauges lamp are: • Engine coolant temperature is high or criticalANTI-LOCK BRAKE SYSTEM LAMP • Engine oil pressure is low The Anti-Lock Brake System (ABS) lamp gives an • Charging system failureindication when the ABS system is faulty or inoper- • System voltage is high.ative. The lamp is hard-wired in the instrument clus-ter, and is completely controlled by the Controller CIGAR LIGHTER AND POWER OUTLETAnti-lock Brake (CAB). It receives battery voltage A cigar lighter and an accessory power outlet arethrough the instrument cluster fused ignition switch standard equipment on this model. Power to theoutput feed circuit, and is grounded by the CAB. The accessory power outlet is provided at all times,lamp is turned on by the CAB for about two seconds regardless of the ignition switch position. Power towhen the ignition switch is turned to the On position the cigar lighter is switched by a cigar lighter relay,as a bulb test. After the bulb test, the CAB turns the which is only energized when the ignition switch islamp on or off based upon the results of the ABS sys- in the Accessory or On positions.tem self-tests. The cigar lighter and accessory power outlet recep- The CAB continually monitors the ABS circuits tacles are located in, and serviced only as a part of,and sensors to decide whether the system is in good the accessory switch bezel unit. If either receptacle isoperating condition. If the CAB turns the lamp on faulty or damaged, the accessory switch bezel mustafter the bulb test, it indicates that the CAB has be replaced.detected a system malfunction and/or that the ABSsystem has become inoperative. Refer to Group 5 - CIGAR LIGHTER RELAYBrakes for more information. The cigar lighter relay is a International Standards Organization (ISO)-type relay. The cigar lighter relayBRAKE WARNING LAMP is a electromechanical device that switches fused bat- The brake warning lamp gives an indication when tery current to the cigar lighter when the ignitionthe parking brake is applied, or when the pressures switch is turned to the Accessory or On positions. Seein the two halves of the split brake hydraulic system the Diagnosis and Testing section of this group forare unequal. The lamp is turned on when the igni-
  7. 7. XJ INSTRUMENT PANEL SYSTEMS 8E - 7DESCRIPTION AND OPERATION (Continued)more information on the operation of the cigar lighter based upon a message received from the Powertrainrelay. Control Module (PCM) on the Chrysler Collision The cigar lighter relay is located in the junction Detection (CCD) data bus.block, on the right cowl side panel below the instru- The PCM uses an input from the analog resistor-ment panel in the passenger compartment. The cigar multiplexed vehicle speed control switches in thelighter relay cannot be repaired and, if faulty or steering wheel to decide whether to turn the lamp ondamaged, it must be replaced. or off. The PCM then sends the proper message to the instrument cluster on the CCD data bus. Refer toCLUSTER ILLUMINATION LAMP Group 8H - Vehicle Speed Control System for more The cluster illumination lamps are hard-wired in information.the instrument cluster. When the park or head lampsare turned on, the cluster illumination lamps light. FOUR-WHEEL DRIVE INDICATOR LAMPIllumination brightness is adjusted by rotating theheadlamp switch knob (clockwise to dim, counter- PART TIMEclockwise to brighten). The instrument cluster illumi- On vehicles with the optional Command-Trac four-nation lamps receive battery feed from the panel wheel drive system, the Part Time indicator lampdimmer rheostat in the headlamp switch through a lights when the transfer case is engaged in the 4H orfuse in the junction block. 4L positions. On vehicles with the optional Selec-Trac Each of the illumination lamps is located on the four-wheel drive system, the Part Time indicatorinstrument cluster circuit board. Each lamp has a lamp lights when the transfer case is engaged in thereplaceable bulb and bulb holder. Refer to Group 8L - 4 X 4 Part Time or 4 Lo positions.Lamps for more information. When the ignition switch is in the On position, bat- tery voltage is supplied to one side of the indicatorCOOLANT TEMPERATURE WARNING LAMP lamp bulb. A normally-open, plunger-type, four-wheel The coolant temperature warning lamp gives an drive switch threaded into the transfer case is hard-indication when the engine coolant temperature is wired in series between the other side of the indica-high. The lamp is turned on by the instrument clus- tor lamp bulb and ground. When the transfer case ister circuitry for about three seconds after the ignition shifted into the proper position, the plunger of theswitch is turned to the On position as a bulb test. four-wheel drive switch is moved, closing the switchAfter the bulb test, the lamp is controlled by the and providing a path to ground. This causes the Partinstrument cluster circuitry based upon an engine Time indicator lamp bulb to light.coolant temperature message received from the Pow- Refer to Group 21 - Transmission for more infor-ertrain Control Module (PCM) on the Chrysler Colli- mation on the transfer case shift mechanism.sion Detection (CCD) data bus. The PCM uses an input from the engine coolant FULL TIMEtemperature sensor and internal programming to The Full Time indicator lamp is only operationaldecide what engine coolant temperature message is on vehicles equipped with the optional Selec-Tracrequired. The PCM then sends the proper message to four-wheel drive system. The Full Time indicatorthe instrument cluster on the CCD data bus. If the lamp lights when the transfer case is engaged in thePCM message indicates that coolant temperature is 4 X 4 Full Time position.high, the instrument cluster circuitry turns on the When the ignition switch is in the On position, bat-coolant temperature warning lamp and generates a tery voltage is supplied to one side of the indicatorsingle chime tone. lamp bulb. A normally-open, plunger-type, four-wheel The engine coolant temperature sensor is installed drive switch threaded into the transfer case is hard-in a threaded hole that penetrates a coolant passage wired in series between the other side of the indica-of the engine. It is a thermistor-type sensor that tor lamp bulb and ground. When the transfer case ischanges its internal resistance with changes in shifted into the proper position, the plunger of theengine coolant temperature. Refer to Group 14 - Fuel four-wheel drive switch is moved, closing the switchSystems for more information on the PCM and the and providing a path to ground. This causes the Fullcoolant temperature sensor. Time indicator lamp bulb to light. Refer to Group 21 - Transmission for more infor-CRUISE-ON INDICATOR LAMP mation on the transfer case shift mechanism. The cruise-on indicator lamp gives an indicationwhen the vehicle speed control system is turned on, HEADLAMP HIGH BEAM INDICATOR LAMPeven when the system is not currently engaged. The The headlamp high beam indicator lamp gives anlamp is controlled by the instrument cluster circuitry indication when the headlamp high beams are turned on. The lamp is controlled by a hard-wired input
  8. 8. 8E - 8 INSTRUMENT PANEL SYSTEMS XJDESCRIPTION AND OPERATION (Continued)from the headlamp dimmer (multi-function) switch. PCM then sends the proper message to the instru-One side of the indicator bulb is grounded at all ment cluster on the CCD data bus. If the PCM mes-times. The other side of the bulb receives a battery sage indicates that oil pressure is low, thefeed through the contacts of the dimmer switch when instrument cluster circuitry turns on the low oil pres-the multi-function switch stalk is actuated to turn on sure warning lamp.the headlamp high beams. Refer to Group 8L - The engine oil pressure sensor is installed in aLamps for more information. threaded hole that penetrates an oil passage of the engine. The engine oil pressure sensor contains aLOW FUEL WARNING LAMP flexible diaphragm and a variable resistor coil. The The low fuel warning lamp gives an indication diaphragm moves in response to changes in thewhen the fuel level in the fuel tank has fallen below engine oil pressure, which changes the internal elec-about one-eighth of a full tank, as registered on the trical resistance of the sensor. Refer to Group 14 -fuel gauge. The instrument cluster circuitry lights Fuel Systems for more information on the PCM andthe lamp for about three seconds when the ignition the engine oil pressure sensor.switch is turned to the On position as a bulb test.After the bulb test, the instrument cluster circuitry LOW WASHER FLUID WARNING LAMPcontrols the lamp based upon a fuel level message The low washer fluid warning lamp gives an indi-received from the Powertrain Control Module (PCM) cation when the fluid level in the washer fluid reser-on the Chrysler Collision Detection (CCD) data bus. voir is too low. The instrument cluster circuitry The PCM uses an input from the fuel gauge send- controls the lamp based upon a hard-wired inputing unit and internal programming to decide what from the washer fluid level sensor.fuel level message is required. The PCM then sends The washer fluid level sensor uses a float in thethe proper message to the instrument cluster on the reservoir to monitor the fluid level. The up and downCCD data bus. If the PCM message indicates that action of the float opens or closes the switch withinthe fuel level is below one-eighth of a full tank for the washer fluid level sensor that provides a groundmore than ten seconds, the instrument cluster cir- signal to the instrument cluster circuitry.cuitry turns on the low fuel warning lamp and gen- If the instrument cluster circuitry senses a grounderates a single chime tone. Once the lamp is turned input from the washer fluid level sensor for moreon, an increase in the fuel level message of at least than about thirty seconds, it turns on the low washerone full needle width for more than twenty seconds is fluid warning lamp. This helps to reduce the effectsrequired before the cluster will turn the lamp off. of fluid sloshing within the reservoir. This lamp also The fuel gauge sending unit is mounted to the elec- latches. Once the lamp has been turned on, it willtric fuel pump module inside the fuel tank. The send- remain on until washer fluid is added to the reser-ing unit has a float attached to the end of a swing- voir and the ignition switch is cycled.arm. The float moves up or down within the fuel Refer to Group 8K - Wiper and Washer Systems fortank as the fuel level changes. As the float moves, an more information on the washer fluid level sensor.electrical contact on the pivot end of the swing-armwipes across a resistor coil, which changes the resis- MALFUNCTION INDICATOR LAMPtance of the sending unit. Refer to Group 14 - Fuel The Check Engine or Malfunction Indicator LampSystems for more information on the PCM and the (MIL) gives an indication when the Powertrain Con-fuel gauge sending unit. trol Module (PCM) has recorded a Diagnostic Trouble Code (DTC) for an On-Board Diagnostics II (OBDII)LOW OIL PRESSURE WARNING LAMP emissions-related circuit or component malfunction. The low oil pressure warning lamp gives an indica- The lamp is controlled by the instrument cluster cir-tion when the engine oil pressure is low. The lamp is cuitry based upon messages received from the PCMturned on by the instrument cluster circuitry for on the Chrysler Collision Detection (CCD) data bus.about three seconds after the ignition switch is The PCM sends a lamp-on message for about threeturned to the On position as a bulb test. After the seconds when the ignition switch is turned to the Onbulb test, the lamp is controlled by the instrument position as a bulb test.cluster circuitry based upon an engine oil pressure Following the bulb test, the PCM uses inputs frommessage received from the Powertrain Control Mod- many emissions-related circuits and sensors, alongule (PCM) on the Chrysler Collision Detection (CCD) with its internal programming, to decide whether adata bus. condition exists that requires the MIL lamp to be The PCM uses an input from the engine oil pres- turned on. The PCM then sends the proper messagesure sensor and internal programming to decide to the instrument cluster on the CCD data bus towhat engine oil pressure message is required. The turn the lamp on or off.
  9. 9. XJ INSTRUMENT PANEL SYSTEMS 8E - 9DESCRIPTION AND OPERATION (Continued) The MIL lamp can also be used to display a stored lamp will then remain off until the vehicle stopsDTC by flashing on and off. Refer to Group 14 - Fuel accelerating and is brought back into the range ofSystems for more information on the PCM or the lamp operation, or until the transmission is shiftedPCM inputs. Refer to Group 25 - Emission Control into another gear. Refer to Group 14 - Fuel SystemsSystems for more information on DTCs and their for more information on the PCM and the PCMretrieval. inputs.SEAT BELT REMINDER LAMP VOLTAGE WARNING LAMP The seat belt reminder lamp gives a visual The voltage warning lamp gives an indicationreminder to the vehicle occupants to fasten their seat when the electrical system voltage is too low or toobelts. The lamp is turned on by the instrument clus- high. The lamp is turned on by the instrument clus-ter circuitry for about seven seconds when the igni- ter circuitry for about three seconds after the ignitiontion switch is turned to the On position. The switch is turned to the On position as a bulb test.instrument cluster also receives a hard-wired input After the bulb test, the lamp is controlled by thefrom the driver seat belt switch. If the driver seat instrument cluster circuitry based upon a systembelt switch is closed (seat belt is not buckled), the voltage message received from the Powertrain Con-instrument cluster will generate a chime warning for trol Module (PCM) on the Chrysler Collision Detec-the duration of the seat belt reminder lamp illumina- tion (CCD) data bus.tion. The chime warning will stop when the driver The PCM uses an input from the electrical systemseat belt switch is open (seat belt is buckled). and internal programming to decide what system Refer to Group 8U - Chime/Buzzer Warning Sys- voltage message is required. The PCM then sendstems for more information on the driver seat belt the proper message to the instrument cluster on theswitch. CCD data bus. If the PCM message indicates that the charging system is too low or too high, theTURN SIGNAL INDICATOR LAMP instrument cluster circuitry turns on the voltage The left and right turn signal indicator lamps give warning lamp.an indication when the turn signal circuits are acti- Refer to Group 14 - Fuel Systems for more infor-vated. The lamps are hard-wired in the instrument mation on the PCM. Refer to Group 8C - Chargingcluster, and are completely controlled by the turn sig- Systems for more information on charging systemnal and hazard warning (multi-function) switches. components and diagnosis. The indicator lamps are grounded at all times andreceive battery feed through the contacts of themulti-function switch when the turn signal lever DIAGNOSIS AND TESTING(multi-function switch stalk) or hazard warning but-ton are actuated to the On position. The instrument INSTRUMENT CLUSTERcluster circuitry does not perform a bulb test of these If all of the gauges and/or indicator lamps are inop-lamps. Refer to Group 8J - Turn Signal and Hazard erative, perform the Preliminary Diagnosis. If anWarning Systems for more information. individual gauge or Chrysler Collision Detection (CCD) data bus message-controlled indicator lamp isUPSHIFT INDICATOR LAMP inoperative, go directly to the Actuator Test. If an Vehicles equipped with a manual transmission individual hard-wired indicator lamp is inoperative,have an upshift indicator lamp. The upshift indicator go directly to the diagnosis for that lamp. For circuitlamp gives an indication when the driver should shift descriptions and diagrams, refer to 8W-40 - Instru-to the next highest gear for the best fuel economy. ment Cluster in Group 8W - Wiring Diagrams.The lamp is controlled by the instrument cluster cir- WARNING: ON VEHICLES EQUIPPED WITH AIR-cuitry based upon a message received from the Pow- BAGS, REFER TO GROUP 8M - PASSIVEertrain Control Module (PCM) on the Chrysler RESTRAINT SYSTEMS BEFORE ATTEMPTING ANYCollision Detection (CCD) data bus. STEERING WHEEL, STEERING COLUMN, OR The PCM uses inputs from many sensors and its INSTRUMENT PANEL COMPONENT DIAGNOSIS ORinternal programming to decide whether the engine SERVICE. FAILURE TO TAKE THE PROPER PRE-speed and load conditions are correct for a transmis- CAUTIONS COULD RESULT IN ACCIDENTAL AIR-sion upshift. The PCM then sends the proper mes- BAG DEPLOYMENT AND POSSIBLE PERSONALsage to the instrument cluster on the CCD data bus INJURY.to turn the lamp on or off. The PCM will send alamp-off message three to five seconds after alamp-on message, if an upshift is not performed. The
  10. 10. 8E - 10 INSTRUMENT PANEL SYSTEMS XJDIAGNOSIS AND TESTING (Continued)PRELIMINARY DIAGNOSIS There should be continuity. If OK, go to the Actuator (1) If the indicator lamps operate, but none of the Test. If not OK, repair the open circuit to ground asgauges operate, go to Step 2. If all of the gauges and required.the data bus message-controlled indicator lamps areinoperative, go to Step 5. ACTUATOR TEST (2) Check the Ignition-Off Draw (IOD) fuse in the The instrument cluster actuator test will put thePower Distribution Center (PDC). If OK, go to Step cluster into its self-diagnostic mode. In this mode the3. If not OK, repair the shorted circuit or component cluster will position each of the gauge needles at var-as required and replace the faulty fuse. ious specified calibration points, and turn all of the (3) Check for battery voltage at the IOD fuse in CCD data bus message-controlled lamps on and off atthe PDC. If OK, go to Step 4. If not OK, repair the specified time intervals (Fig. 1) or (Fig. 2).open circuit as required. Successful completion of the actuator test will con- (4) Disconnect and isolate the battery negative firm that the cluster circuitry, gauges, and lamps arecable. Remove the instrument cluster as described in capable of operating as designed. However, there maythis group. Connect the battery negative cable. Check still be a problem with the CCD data bus, the Pow-for battery voltage at the fused B(+) circuit cavity of ertrain Control Module (PCM), the Airbag Controlthe left instrument cluster wire harness connector Module (ACM), or the inputs to one of these modules.(connector A). If OK, go to the Actuator Test. If not Use a DRB scan tool and the proper Diagnostic Pro-OK, repair the open circuit to the IOD fuse as cedures manual for testing of these components.required. If an individual gauge does not respond properly or (5) Check the switched ignition fuse in the junc- at all during the Actuator Test, the instrument clus-tion block. If OK, go to Step 6. If not OK, repair the ter should be removed. However, check the gaugeshorted circuit or component as required and replace mounting screws on the printed circuit board forthe faulty fuse. proper tightness before considering instrument clus- (6) Turn the ignition switch to the On position and ter replacement. If the mounting screws check OK,check for battery voltage at the switched ignition replace the faulty cluster.fuse in the junction block. If OK, go to Step 7. If not If an individual indicator lamp does not illuminateOK, repair the open circuit to the ignition switch as during the Actuator Test, the instrument clusterrequired. should be removed. However, check that the incan- (7) Turn the ignition switch to the Off position. descent lamp bulb is not faulty and that the bulbDisconnect and isolate the battery negative cable. holder is properly installed on the circuit boardReinstall the instrument cluster. Connect the battery before considering instrument cluster replacement. Ifnegative cable. Turn the ignition switch to the On the bulb and bulb holder check OK, replace theposition. Set the parking brake. The brake warning faulty instrument cluster.lamp should light. If OK, go to Step 8. If not OK, go (1) Begin the test with the ignition switch in theto Step 9. Off position. (8) Turn the ignition switch to the Off position. (2) Depress the trip odometer reset button.Turn on the park lamps and adjust the panel lamps (3) While holding the trip odometer reset buttondimmer rheostat to the full bright position. The clus- depressed, turn the ignition switch to the On posi-ter illumination lamps should light. If OK, go to the tion, but do not start the engine.Actuator Test. If not OK, go to Step 10. (4) Release the trip odometer reset button. (9) Turn the ignition switch to the Off position. (5) Compare the operation of the suspect gauge(s)Disconnect and isolate the battery negative cable. and/or lamp(s) with the chart (Fig. 1) or (Fig. 2).Remove the instrument cluster as described in this (6) The cluster will exit the self-diagnostic mode atgroup. Connect the battery negative cable. Turn the the completion of the test, or if the ignition switch isignition switch to the On position. Check for battery turned to the Off position.voltage at the fused ignition switch output (run/start) (7) Go back to Step 1 to repeat the test, ifcircuit cavity of the left instrument cluster wire har- required.ness connector (connector A). If OK, go to the Actua-tor Test. If not OK, repair the open circuit to the COOLANT TEMPERATURE GAUGEjunction block as required. If the problem being diagnosed is related to coolant (10) Disconnect and isolate the battery negative temperature gauge accuracy, be certain to confirmcable. Remove the instrument cluster as described in that the problem is with the gauge and not with cool-this group. Check for continuity between the ground ing system performance. The actual engine coolantcircuit cavity of the left instrument cluster wire har- temperature should be checked with a test gauge orness connector (connector A) and a good ground. thermometer and compared to the instrument cluster coolant temperature gauge readings before you pro-
  11. 11. XJ INSTRUMENT PANEL SYSTEMS 8E - 11DIAGNOSIS AND TESTING (Continued) NOTE:WASHER PER HOUR) WARNING ODOMETER FUEL (KILOMETERS (MILES1.5 SPEEDOMETER COOLANT BATTERY SECONDS LOW BELTTEMPERATURE CRUISE WARNING CHECK ENGINE (MIL) UPSHIFT PRESSURE WARNING SEAT OILON AIRBAGPER HOUR) AFTER COMPLETING TEST, ALL 2 SEC. DIAGNOSTICS SEC. START 2 SEC. POINTERS SHOULD 2 RETURN TO SEC. 2 POINTER SEC. AND SEC. 2 SEC. 2 STOP 2 ODOMETER SHOULD BE TURNED OFF.2 SEC. 2 SEC. COMPLETE DIAGNOSTICS 2 SEC. ON OFF ON OFF ON OFF ON OFF ON OFF ON OFF ON OFF ON OFF ON OFF Fig. 1 Low-Line Instrument Cluster Actuator Test
  12. 12. 8E - 12 INSTRUMENT PANEL SYSTEMS XJDIAGNOSIS AND TESTING (Continued) ODOMETER VOLT OIL TEMPERATURE FUEL BELT TACHOMETER (KILOMETERS (MILES GAUGES HOUR) SPEEDOMETER CRUISE ENGINE (MIL) CHECK1.5 UPSHIFTON HOUR EXCEPT COMPLETING TEST, ALL POINTERS 2SHOULD2RETURN TO SEC. 2 SEC. SEAT WASHER PER POLICE ONLY) AIRBAGPERWARNING LOW FUEL SECONDS AFTER POLICE) NOTE: 2 SEC. DIAGNOSTICS START SEC. SEC. 2 POINTER STOP AND ODOMETER SHOULD BE TURNED OFF.SEC. 2 SEC. 2 SEC. 2 SEC.COMPLETE DIAGNOSTICS 2 SEC. 2 ON OFF ON OFF ON OFF ON OFF ON OFF ON OFF ON OFF ON OFF Fig. 2 High-Line Instrument Cluster Actuator Test
  13. 13. XJ INSTRUMENT PANEL SYSTEMS 8E - 13DIAGNOSIS AND TESTING (Continued)ceed with gauge diagnosis. Refer to Group 7 - Cooling with an incorrect speedometer pinion gear, axle ratio,System for more information. Refer to Group 8W - or tire size. Refer to Group 21 - Transmission forWiring Diagrams for circuit descriptions and dia- more information on the speedometer pinion gear.grams. Refer to Group 8W - Wiring Diagrams for circuit descriptions and diagrams.WARNING: ON VEHICLES EQUIPPED WITH AIR-BAGS, REFER TO GROUP 8M - PASSIVE WARNING: ON VEHICLES EQUIPPED WITH AIR-RESTRAINT SYSTEMS BEFORE ATTEMPTING ANY BAGS, REFER TO GROUP 8M - PASSIVESTEERING WHEEL, STEERING COLUMN, OR RESTRAINT SYSTEMS BEFORE ATTEMPTING ANYINSTRUMENT PANEL COMPONENT DIAGNOSIS OR STEERING WHEEL, STEERING COLUMN, ORSERVICE. FAILURE TO TAKE THE PROPER PRE- INSTRUMENT PANEL COMPONENT DIAGNOSIS ORCAUTIONS COULD RESULT IN ACCIDENTAL AIR- SERVICE. FAILURE TO TAKE THE PROPER PRE-BAG DEPLOYMENT AND POSSIBLE PERSONAL CAUTIONS COULD RESULT IN ACCIDENTAL AIR-INJURY. BAG DEPLOYMENT AND POSSIBLE PERSONAL INJURY. Diagnosis of the coolant temperature sensor andcircuit, the Chrysler Collision Detection (CCD) data Diagnosis of the vehicle speed sensor and circuit,bus, and/or the Powertrain Control Module (PCM) the Chrysler Collision Detection (CCD) data bus,should be performed with a DRB scan tool as and/or the Powertrain Control Module (PCM) shoulddescribed in the proper Diagnostic Procedures man- be performed with a DRB scan tool as described inual. For diagnosis of the coolant temperature gauge the proper Diagnostic Procedures manual. For diag-and the instrument cluster circuitry, see Instrument nosis of the odometer and/or trip odometer and theCluster in this group. instrument cluster circuitry, see Instrument Cluster in this group.FUEL GAUGE If the problem being diagnosed is related to fuel OIL PRESSURE GAUGEgauge accuracy, be certain to confirm that the prob- If the problem being diagnosed is related to oillem is with the gauge or sending unit and not with pressure gauge accuracy, be certain to confirm thatthe fuel tank. Inspect the fuel tank for signs of dam- the problem is with the gauge and not with theage or distortion that could affect the sending unit engine oiling system performance. The actual engineperformance before you proceed with fuel gauge diag- oil pressure should be checked with a test gauge andnosis. Refer to Group 8W - Wiring Diagrams for cir- compared to the instrument cluster oil pressurecuit descriptions and diagrams. gauge readings before you proceed with gauge diag- nosis. Refer to Group 9 - Engines for more informa-WARNING: ON VEHICLES EQUIPPED WITH AIR- tion. Refer to Group 8W - Wiring Diagrams for circuitBAGS, REFER TO GROUP 8M - PASSIVE descriptions and diagrams.RESTRAINT SYSTEMS BEFORE ATTEMPTING ANYSTEERING WHEEL, STEERING COLUMN, OR WARNING: ON VEHICLES EQUIPPED WITH AIR-INSTRUMENT PANEL COMPONENT DIAGNOSIS OR BAGS, REFER TO GROUP 8M - PASSIVESERVICE. FAILURE TO TAKE THE PROPER PRE- RESTRAINT SYSTEMS BEFORE ATTEMPTING ANYCAUTIONS COULD RESULT IN ACCIDENTAL AIR- STEERING WHEEL, STEERING COLUMN, ORBAG DEPLOYMENT AND POSSIBLE PERSONAL INSTRUMENT PANEL COMPONENT DIAGNOSIS ORINJURY. SERVICE. FAILURE TO TAKE THE PROPER PRE- CAUTIONS COULD RESULT IN ACCIDENTAL AIR- Diagnosis of the fuel gauge sending unit and cir- BAG DEPLOYMENT AND POSSIBLE PERSONALcuit, the Chrysler Collision Detection (CCD) data INJURY.bus, and/or the Powertrain Control Module (PCM)should be performed with a DRB scan tool as Diagnosis of the oil pressure sensor and circuit, thedescribed in the proper Diagnostic Procedures man- Chrysler Collision Detection (CCD) data bus, and/orual. For diagnosis of the fuel gauge and the instru- the Powertrain Control Module (PCM) should be per-ment cluster circuitry, see Instrument Cluster in this formed with a DRB scan tool as described in thegroup. proper Diagnostic Procedures manual. For diagnosis of the oil pressure gauge and the instrument clusterODOMETER AND TRIP ODOMETER circuitry, see Instrument Cluster in this group. If the problem being diagnosed is related to odom-eter and/or trip odometer accuracy, be certain to con-firm that the problem is with the display and not
  14. 14. 8E - 14 INSTRUMENT PANEL SYSTEMS XJDIAGNOSIS AND TESTING (Continued)SPEEDOMETER Group 8W - Wiring Diagrams for circuit descriptions If the problem being diagnosed is related to speed- and diagrams.ometer accuracy, be certain to confirm that the prob-lem is with the speedometer gauge and not with an WARNING: ON VEHICLES EQUIPPED WITH AIR-incorrect speedometer pinion gear, axle ratio, or tire BAGS, REFER TO GROUP 8M - PASSIVEsize. Refer to Group 21 - Transmission for more infor- RESTRAINT SYSTEMS BEFORE ATTEMPTING ANYmation on the speedometer pinion gear. Refer to STEERING WHEEL, STEERING COLUMN, ORGroup 8W - Wiring Diagrams for circuit descriptions INSTRUMENT PANEL COMPONENT DIAGNOSIS ORand diagrams. SERVICE. FAILURE TO TAKE THE PROPER PRE- CAUTIONS COULD RESULT IN ACCIDENTAL AIR-WARNING: ON VEHICLES EQUIPPED WITH AIR- BAG DEPLOYMENT AND POSSIBLE PERSONALBAGS, REFER TO GROUP 8M - PASSIVE INJURY.RESTRAINT SYSTEMS BEFORE ATTEMPTING ANYSTEERING WHEEL, STEERING COLUMN, OR Diagnosis of the system voltage input circuit, theINSTRUMENT PANEL COMPONENT DIAGNOSIS OR Chrysler Collision Detection (CCD) data bus, and/orSERVICE. FAILURE TO TAKE THE PROPER PRE- the Powertrain Control Module (PCM) should be per-CAUTIONS COULD RESULT IN ACCIDENTAL AIR- formed with a DRB scan tool as described in theBAG DEPLOYMENT AND POSSIBLE PERSONAL proper Diagnostic Procedures manual. For diagnosisINJURY. of the voltmeter and the instrument cluster circuitry, see Instrument Cluster in this group. Diagnosis of the vehicle speed sensor and circuit,the Chrysler Collision Detection (CCD) data bus, AIRBAG INDICATOR LAMPand/or the Powertrain Control Module (PCM) should The diagnosis found here addresses an inoperativebe performed with a DRB scan tool as described in airbag indicator lamp condition. If the airbag indica-the proper Diagnostic Procedures manual. For diag- tor lamp stays on with the ignition switch in the Onnosis of the speedometer and the instrument cluster position, or comes on and stays on while driving,circuitry, see Instrument Cluster in this group. refer to Group 8M - Passive Restraint Systems for diagnosis. For circuit descriptions and diagrams,TACHOMETER refer to 8W-40 - Instrument Cluster, and 8W-43 - Air- bag System in Group 8W - Wiring Diagrams.WARNING: ON VEHICLES EQUIPPED WITH AIR-BAGS, REFER TO GROUP 8M - PASSIVE WARNING: ON VEHICLES EQUIPPED WITH AIR-RESTRAINT SYSTEMS BEFORE ATTEMPTING ANY BAGS, REFER TO GROUP 8M - PASSIVESTEERING WHEEL, STEERING COLUMN, OR RESTRAINT SYSTEMS BEFORE ATTEMPTING ANYINSTRUMENT PANEL COMPONENT DIAGNOSIS OR STEERING WHEEL, STEERING COLUMN, ORSERVICE. FAILURE TO TAKE THE PROPER PRE- INSTRUMENT PANEL COMPONENT DIAGNOSIS ORCAUTIONS COULD RESULT IN ACCIDENTAL AIR- SERVICE. FAILURE TO TAKE THE PROPER PRE-BAG DEPLOYMENT AND POSSIBLE PERSONAL CAUTIONS COULD RESULT IN ACCIDENTAL AIR-INJURY. BAG DEPLOYMENT AND POSSIBLE PERSONAL INJURY. Refer to Group 8W - Wiring Diagrams for circuitdescriptions and diagrams. Diagnosis of the crank- If the airbag indicator lamp fails to light when theshaft position sensor and circuit, the Chrysler Colli- ignition switch is turned to the On position, replacesion Detection (CCD) data bus, and/or the Powertrain the airbag indicator lamp bulb with a known goodControl Module (PCM) should be performed with a unit. If the airbag indicator lamp still fails to oper-DRB scan tool as described in the proper Diagnostic ate, diagnosis of the airbag lamp and the instrumentProcedures manual. For diagnosis of the tachometer cluster circuitry should be performed as described inand the instrument cluster circuitry, see Instrument Instrument Cluster in this group. If the airbag lampCluster in this group. and instrument cluster circuitry are OK, diagnosis of the airbag system and the CCD data bus should beVOLTMETER performed with a DRB scan tool as described in the If the problem being diagnosed is related to volt- proper Diagnostic Procedures manual.meter gauge accuracy, be certain to confirm propercharging system operation before considering instru- ANTI-LOCK BRAKE SYSTEM LAMPment cluster replacement. Refer to Group 8C - The diagnosis found here addresses an inoperativeCharging System for more information. Refer to Anti-lock Brake System (ABS) lamp condition. If the ABS lamp stays on with the ignition switch in the
  15. 15. XJ INSTRUMENT PANEL SYSTEMS 8E - 15DIAGNOSIS AND TESTING (Continued)On position, or comes on and stays on while driving, position and the parking brake released, or comes onrefer to Group 5 - Brakes for diagnosis. If no ABS while driving, refer to Group 5 - Brakes for diagnosis.problem is found, the following procedure will help If no service brake or parking brake problem islocate a short or open in the ABS lamp circuit. For found, the following procedure will help locate acircuit descriptions and diagrams, refer to 8W-40 - short or open circuit, or a faulty switch. Refer toInstrument Cluster, and 8W-35 - All-Wheel Anti-Lock 8W-40 - Instrument Cluster, and 8W-35 - All-WheelBrakes in Group 8W - Wiring Diagrams. Anti-Lock Brakes in Group 8W - Wiring Diagrams for circuit descriptions and diagrams.WARNING: ON VEHICLES EQUIPPED WITH AIR-BAGS, REFER TO GROUP 8M - PASSIVE WARNING: ON VEHICLES EQUIPPED WITH AIR-RESTRAINT SYSTEMS BEFORE ATTEMPTING ANY BAGS, REFER TO GROUP 8M - PASSIVESTEERING WHEEL, STEERING COLUMN, OR RESTRAINT SYSTEMS BEFORE ATTEMPTING ANYINSTRUMENT PANEL COMPONENT DIAGNOSIS OR STEERING WHEEL, STEERING COLUMN, ORSERVICE. FAILURE TO TAKE THE PROPER PRE- INSTRUMENT PANEL COMPONENT DIAGNOSIS ORCAUTIONS COULD RESULT IN ACCIDENTAL AIR- SERVICE. FAILURE TO TAKE THE PROPER PRE-BAG DEPLOYMENT AND POSSIBLE PERSONAL CAUTIONS COULD RESULT IN ACCIDENTAL AIR-INJURY. BAG DEPLOYMENT AND POSSIBLE PERSONAL INJURY. (1) Check the fuse in the junction block. If OK, goto Step 2. If not OK, repair the shorted circuit or (1) Check the fuse in the junction block. If OK, gocomponent as required and replace the faulty fuse. to Step 2. If not OK, repair the shorted circuit or (2) Turn the ignition switch in the On position. component as required and replace the faulty fuse.Check for battery voltage at the fuse in the junction (2) Turn the ignition switch to the On position.block. If OK, go to Step 3. If not OK, repair the open Check for battery voltage at the fuse in the junctioncircuit to the ignition switch as required. block. If OK, go to Step 3. If not OK, repair the open (3) Turn the ignition switch to the Off position. circuit to the ignition switch as required.Disconnect and isolate the battery negative cable. (3) Turn the ignition switch to the Off position.Remove the instrument cluster as described in this Disconnect and isolate the battery negative cable.group. Connect the battery negative cable. Turn the Unplug the wire harness connector at the park brakeignition switch to the On position and within five switch. With the park brake released, check for con-seconds check for continuity between the ABS warn- tinuity between the park brake switch terminal anding lamp driver circuit cavity of the left instrument a good ground. There should be no continuity. If OK,cluster wire harness connector (connector A) and a go to Step 4. If not OK, adjust or replace the faultygood ground. There should be continuity for five sec- park brake switch.onds after ignition On, and then an open circuit. If (4) Unplug the wire harness connector at theOK, replace the faulty bulb. If not OK, go to Step 4. brake warning switch. Check for continuity between (4) Turn the ignition switch to the Off position. the two terminals of the brake warning switch. ThereDisconnect and isolate the battery negative cable. should be continuity. If OK, go to Step 5. If not OK,Disconnect the Controller Anti-lock Brake (CAB) wire replace the faulty brake warning switch.harness connector. Check for continuity between the (5) Check for continuity between each of the twoABS warning lamp driver circuit cavity of the left brake warning switch terminals and a good ground.instrument cluster wire harness connector (connector In each case, there should be no continuity. If OK, goA) and a good ground. There should be no continuity. to Step 6. If not OK, replace the faulty brake warn-If OK, go to Step 5. If not OK, repair the short circuit ing switch.as required. (6) With both the park brake switch and the brake (5) Check for continuity between the ABS warning warning switch wire harness connectors stilllamp driver circuit cavities of the left instrument unplugged, check for continuity between the parkcluster wire harness connector (connector A) and the brake switch wire harness connector cavity and aCAB wire harness connector. There should be conti- good ground. There should be no continuity. If OK, gonuity. If OK, refer to Group 5 - Brakes for diagnosis to Step 7. If not OK, repair the short circuit asof the CAB. If not OK, repair the open circuit as required.required. (7) With the ignition switch held in the Start posi- tion, check for continuity between the park brakeBRAKE WARNING LAMP switch wire harness connector cavity and a good The diagnosis found here addresses an inoperative ground. There should be continuity. If OK, go to Stepbrake warning lamp condition. If the brake warning 8. If not OK, refer to Group 8D - Ignition Systems forlamp stays on with the ignition switch in the On diagnosis of the ignition switch.
  16. 16. 8E - 16 INSTRUMENT PANEL SYSTEMS XJDIAGNOSIS AND TESTING (Continued) (8) Turn the ignition switch to the Off position. SERVICE. FAILURE TO TAKE THE PROPER PRE-Remove the instrument cluster as described in this CAUTIONS COULD RESULT IN ACCIDENTAL AIR-group. Check for continuity between the red brake BAG DEPLOYMENT AND POSSIBLE PERSONALwarning lamp driver circuit cavity of the left instru- INJURY.ment cluster wire harness connector (connector A)and a good ground. There should be no continuity. IfOK, go to Step 9. If not OK, repair the short circuit ACCESSORY POWER OUTLETas required. (1) Check the fuse in the junction block. If OK, go (9) Check for continuity between the red brake to Step 2. If not OK, repair the shorted circuit orwarning lamp driver (G99) circuit cavities of the left component as required and replace the faulty fuse.instrument cluster wire harness connector (connector (2) Check for battery voltage at the fuse in theA) and the brake warning switch wire harness con- junction block. If OK, go to Step 3. If not OK, repairnector. There should be continuity. If OK, replace the the open circuit to the Power Distribution Centerfaulty bulb. If not OK, repair the open circuit as (PDC) as required.required. (3) Disconnect and isolate the battery negative cable. Remove the accessory switch bezel asCHECK GAUGES LAMP described in this group. Check for continuity between The diagnosis found here addresses an inoperative the ground circuit cavity of the accessory power out-check gauges lamp condition. If the check gauges let wire harness connector and a good ground. Therelamp stays on with the ignition switch in the On should be continuity. If OK, go to Step 4. If not OK,position, or comes on while driving with no unusual repair the open circuit to ground as required.gauge readings evident, diagnosis of the Powertrain (4) Connect the battery negative cable. Check forControl Module (PCM) and the Chrysler Collision battery voltage at the fused B(+) circuit cavity of theDetection (CCD) data bus should be performed with accessory power outlet wire harness connector. If OK,a DRB scan tool as described in the proper Diagnos- replace the faulty accessory switch bezel. If not OK,tic Procedures manual. For circuit descriptions and repair the open circuit to the junction block fuse asdiagrams, refer to 8W-40 - Instrument Cluster in required.Group 8W - Wiring Diagrams. CIGAR LIGHTERWARNING: ON VEHICLES EQUIPPED WITH AIR- (1) Disconnect and isolate the battery negativeBAGS, REFER TO GROUP 8M - PASSIVE cable. Remove the accessory switch bezel asRESTRAINT SYSTEMS BEFORE ATTEMPTING ANY described in this group. Check for continuity betweenSTEERING WHEEL, STEERING COLUMN, OR the ground circuit cavity of the cigar lighter wireINSTRUMENT PANEL COMPONENT DIAGNOSIS OR harness connector and a good ground. There shouldSERVICE. FAILURE TO TAKE THE PROPER PRE- be continuity. If OK, go to Step 2. If not OK, repairCAUTIONS COULD RESULT IN ACCIDENTAL AIR- the open circuit to ground as required.BAG DEPLOYMENT AND POSSIBLE PERSONAL (2) Connect the battery negative cable. Turn theINJURY. ignition switch to the Accessory or On positions. Check for battery voltage at the cigar lighter relay If the check gauges lamp fails to light during the output circuit cavity of the cigar lighter wire harnessbulb test (about three seconds after the ignition connector. If OK, replace the faulty accessory switchswitch is turned to the On position), replace the bezel. If not OK, see the diagnosis for the cigarcheck gauges lamp bulb with a known good unit. If lighter relay in this group.the coolant temperature gauge, oil pressure gauge, orvoltmeter are giving an indication that should trigger CIGAR LIGHTER RELAYthe check gauges lamp, but the check gauges lamp For circuit descriptions and diagrams, refer tostill fails to operate, see Instrument Cluster in this 8W-41 - Horns/Cigar Lighter in Group 8W - Wiringgroup for diagnosis of the check gauges lamp and the Diagrams.instrument cluster circuitry.CIGAR LIGHTER AND POWER OUTLETWARNING: ON VEHICLES EQUIPPED WITH AIR-BAGS, REFER TO GROUP 8M - PASSIVERESTRAINT SYSTEMS BEFORE ATTEMPTING ANYSTEERING WHEEL, STEERING COLUMN, ORINSTRUMENT PANEL COMPONENT DIAGNOSIS OR
  17. 17. XJ INSTRUMENT PANEL SYSTEMS 8E - 17DIAGNOSIS AND TESTING (Continued)WARNING: ON VEHICLES EQUIPPED WITH AIR- (3) The relay normally open terminal (87) is con-BAGS, REFER TO GROUP 8M - PASSIVE nected to the common feed terminal (30) in the ener-RESTRAINT SYSTEMS BEFORE ATTEMPTING ANY gized position. This terminal supplies battery voltageSTEERING WHEEL, STEERING COLUMN, OR to the cigar lighter. There should be continuityINSTRUMENT PANEL COMPONENT DIAGNOSIS OR between the cavity for relay terminal 87 and theSERVICE. FAILURE TO TAKE THE PROPER PRE- cigar lighter relay output circuit cavity of the cigarCAUTIONS COULD RESULT IN ACCIDENTAL AIR- lighter wire harness connector at all times. If OK, goBAG DEPLOYMENT AND POSSIBLE PERSONAL to Step 4. If not OK, repair the open circuit to theINJURY. cigar lighter as required. (4) The coil battery terminal (86) is connected to the electromagnet in the relay. It is connected toRELAY TEST fused ignition switch output and should be hot when The cigar lighter relay is located in the junction the ignition switch is in the On or Accessory posi-block. The junction block is attached to the right cowl tions. Check for battery voltage at the cavity forside inner panel, below the instrument panel and relay terminal 86 with the ignition switch in the Onbehind the right cowl side trim panel. or Accessory positions. If OK, go to Step 5. If not OK, Remove the cigar lighter relay from the junction repair the open circuit to the ignition switch asblock as described in this group to perform the fol- required.lowing tests: (5) The coil ground terminal (85) is connected to (1) A relay in the de-energized position should the electromagnet in the relay. It is grounded at allhave continuity between terminals 87A and 30, and times. Check for continuity to ground at the cavityno continuity between terminals 87 and 30. If OK, go for relay terminal 85. There should be continuity. Ifto Step 2. If not OK, replace the faulty relay. not OK, repair the open circuit to ground as (2) Resistance between terminals 85 and 86 (elec- required.tromagnet) should be 75 Ϯ 5 ohms. If OK, go to Step3. If not OK, replace the faulty relay. CLUSTER ILLUMINATION LAMP (3) Connect a battery to terminals CAVITIES 85 and 86. RELAY RELAY TERMINALS The diagnosis found here addresses an inoperativeThere should now be continuity between terminals instrument cluster illumination lamp condition. If30 and 87, and no continuity between terminals 87A the problem being diagnosed includes inoperativeand 30. If OK, see the Relay Circuit Test in this exterior lighting controlled by the headlamp switch,group. If not OK, replace the faulty relay. that system needs to be repaired first. If the exterior lamps controlled by the headlamp switch are inoper- ative, refer to Group 8L - Lamps for diagnosis. If no exterior lighting system problems are found, the fol- lowing procedure will help locate a short or open in the cluster illumination lamp circuit. For circuit descriptions and diagrams, refer to 8W-40 - Instru- ment Cluster in Group 8W - Wiring Diagrams. WARNING: ON VEHICLES EQUIPPED WITH AIR- BAGS, REFER TO GROUP 8M - PASSIVE RESTRAINT SYSTEMS BEFORE ATTEMPTING ANY STEERING WHEEL, STEERING COLUMN, OR INSTRUMENT PANEL COMPONENT DIAGNOSIS OR SERVICE. FAILURE TO TAKE THE PROPER PRE- CAUTIONS COULD RESULT IN ACCIDENTAL AIR- BAG DEPLOYMENT AND POSSIBLE PERSONAL Cigar Lighter Relay INJURY.RELAY CIRCUIT TEST (1) Check the fuse in the junction block. If OK, go (1) The relay common feed terminal cavity (30) is to Step 2. If not OK, repair the shorted circuit orconnected to battery voltage and should be hot at all component as required and replace the faulty fuse.times. If OK, go to Step 2. If not OK, repair the open (2) Turn the park lamps on with the headlampcircuit to the fuse in the junction block as required. switch. Rotate the headlamp switch knob counter- (2) The relay normally closed terminal (87A) is clockwise to just before the interior lamps detent.connected to terminal 30 in the de-energized position, Check for battery voltage at the fuse in the junctionbut is not used for this application. Go to Step 3. block. Rotate the headlamp switch knob clockwise

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