ZJ                                                                             INSTRUMENT PANEL AND GAUGES                ...
8E - 2    INSTRUMENT PANEL AND GAUGES                                                                        ZJ• electroni...
ZJ                                                              INSTRUMENT PANEL AND GAUGES                8E - 3has detec...
8E - 4    INSTRUMENT PANEL AND GAUGES                                                                         ZJGRAPHIC DI...
ZJ                                                            INSTRUMENT PANEL AND GAUGES                8E - 5REAR LAMP F...
8E - 6    INSTRUMENT PANEL AND GAUGES                                                                        ZJ           ...
ZJ                                                             INSTRUMENT PANEL AND GAUGES               8E - 7If OK, refe...
8E - 8      INSTRUMENT PANEL AND GAUGES                                                                     ZJometer pinio...
ZJ                 INSTRUMENT PANEL AND GAUGES   8E - 9     INSTRUMENT CLUSTER
8E - 10    INSTRUMENT PANEL AND GAUGES                                                                      ZJ  (3) Turn i...
ZJ                                                            INSTRUMENT PANEL AND GAUGES                8E - 11  (4) Chec...
8E - 12   INSTRUMENT PANEL AND GAUGES                                     ZJ                        GRAPHIC DISPLAY MODULE...
ZJ                INSTRUMENT PANEL AND GAUGES   8E - 13     VIC SELF-DIAGNOSIS
8E - 14   INSTRUMENT PANEL AND GAUGES                       ZJ                          VIC FLUID LEVEL FAULT DIAGNOSIS
ZJ                      INSTRUMENT PANEL AND GAUGES   8E - 15     VIC REAR LAMP FAULT DIAGNOSIS
8E - 16   INSTRUMENT PANEL AND GAUGES                      ZJ                         VIC 4WD DISPLAY FAULT DIAGNOSIS
ZJ   INSTRUMENT PANEL AND GAUGES   8E - 17                                        VIC SYSTEM SCHEMATIC
8E - 18         INSTRUMENT PANEL AND GAUGES                                                                    ZJ         ...
ZJ                 INSTRUMENT PANEL AND GAUGES   8E - 19     VIC INITIAL SET-UP
8E - 20   INSTRUMENT PANEL AND GAUGES                 ZJ                               VIC RESET PROCEDURES
ZJ                                                         INSTRUMENT PANEL AND GAUGES                8E - 21             ...
8E - 22      INSTRUMENT PANEL AND GAUGES                                                                     ZJ           ...
ZJ                      INSTRUMENT PANEL AND GAUGES   8E - 23     Fig. 13 Instrument Cluster
8E - 24    INSTRUMENT PANEL AND GAUGES                                                                       ZJ           ...
ZJ                                                       INSTRUMENT PANEL AND GAUGES            8E - 25                   ...
8E - 26    INSTRUMENT PANEL AND GAUGES                                                                    ZJ  (12) With le...
ZJ                                                     INSTRUMENT PANEL AND GAUGES          8E - 27(19) Remove 2 screws ho...
8E - 28      INSTRUMENT PANEL AND GAUGES                                                                ZJ  (22) Remove re...
ZJ                                     INSTRUMENT PANEL AND GAUGES   8E - 29COOLANT LEVEL SENSOR REMOVE/INSTALL   WASHER F...
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  1. 1. ZJ INSTRUMENT PANEL AND GAUGES 8E - 1 INSTRUMENT PANEL AND GAUGES CONTENTS page pageDIAGNOSIS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6 SERVICE PROCEDURES . . . . . . . . . . . . . . . . . . 22GENERAL INFORMATION . . . . . . . . . . . . . . . . . . 1 SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . 30 GENERAL INFORMATION Following are general descriptions of major instru- • trip odometerment panel components. Refer to Group 8W - Wiring • voltmeter.Diagrams for complete circuit descriptions and dia- The cluster includes provisions for the following in-grams. dicator lamps: • airbag indicator lampINSTRUMENT PANEL • anti-lock brake system lamp Modular instrument panel construction allows all • brake warning lampgauges and controls to be serviced from the front of • hazard warning indicator (export)the panel. In addition, most instrument panel wiring • headlamp high beam indicator lampor heater and air conditioning components can be ac- • low fuel warning lampcessed without complete instrument panel removal. • malfunction indicator (Check Engine) lamp Removal of the dash pad and center cluster bezel • master lighting indicator (export)allows access to the cluster assembly, the climate • seat belt reminder lampcontrols, the graphic display module/vehicle informa- • security lamption center, and the radio. Removal of the cluster as- • turn signal indicator lampssembly allows access to the individual gauges, • upshift indicator lamp.illumination and indicator lamp bulbs, printed cir-cuit, and most wiring. GAUGES Removal of the lower instrument panel trim, knee With the ignition switch in the ON or START posi-blocker, and glove box module allows access to the tion, voltage is supplied to all gauges through the in-left and right switch pods, heater and air condition- strument cluster printed circuit. With the ignitioning components, wiring, and steering column mounts. switch in the OFF position, voltage is not supplied toA cover inside the glove box conceals the relay center, the gauges. A gauge pointer may remain within theand a cover on the right end of the instrument panel gauge scale after the ignition switch is OFF. How-conceals the fuseblock module. ever, the gauges do not accurately indicate any vehi- cle condition unless the ignition switch is ON.INSTRUMENT CLUSTERS All gauges except the odometer are air core mag- One basic instrument cluster is offered on all netic units. Two fixed electromagnetic coils are lo-Grand Cherokee models. The cluster is served by a cated within the gauge. These coils are wrapped atsingle printed circuit and wiring connector. The clus- right angles to each other around a movable perma-ter also includes a message center area containing up nent magnet. The movable magnet is suspendedto 13 indicator lamps. The message center is served within the coils on one end of a shaft. The gauge nee-by the same printed circuit and wiring connector as dle is attached to the other end of the shaft.the cluster. Some variations of the cluster exist due One of the coils has a fixed current flowing throughto optional equipment and regulatory requirements. it to maintain a constant magnetic field strength. The instrument cluster includes the following Current flow through the second coil changes, whichgauges: causes changes in its magnetic field strength. The• coolant temperature gauge current flowing through the second coil can be• fuel gauge changed by:• oil pressure gauge • a variable resistor-type sending unit (fuel level,• speedometer/odometer coolant temperature, or oil pressure)• tachometer • changes in electrical system voltage (voltmeter)
  2. 2. 8E - 2 INSTRUMENT PANEL AND GAUGES ZJ• electronic control circuitry (speedometer/odometer, transfer case, axle ratio and tire size. Refer to Grouptachometer). 21 - Transmission and Transfer Case for more infor- The gauge needle moves as the movable permanent mation.magnet aligns itself to the changing magnetic fieldscreated around it by the electromagnets. TACHOMETER The tachometer gives an indication of engine speedCOOLANT TEMPERATURE GAUGE in Revolutions-Per-Minute (RPM). With the engine The coolant temperature gauge gives an indication running, the tachometer receives an engine speedof engine coolant temperature. The coolant tempera- pulse signal from the Powertrain Control Moduleture sending unit is a thermistor that changes elec- (PCM). An electronic integrated circuit containedtrical resistance with changes in engine coolant within the tachometer reads and analyzes the pulsetemperature. High sending unit resistance causes signal. It then adjusts the ground path resistance oflow coolant temperature readings. Low resistance one electromagnet in the gauge to control needlecauses high coolant temperature readings. Sending movement. Frequency values for the pulse signal areunit resistance values are shown in a chart in Spec- shown in a chart in Specifications.ifications. TRIP ODOMETERFUEL GAUGE The trip odometer is driven by the same electronic The fuel gauge gives an indication of the level of integrated circuit as the speedometer/odometer. How-fuel in the fuel tank. The fuel gauge sending unit has ever, by depressing the trip odometer reset knob ona float attached to a swing-arm in the fuel tank. The the face of the speedometer, the trip odometer can befloat moves up or down within the fuel tank as fuel reset to zero. The trip odometer is serviced only as alevel changes. As the float moves, an electrical con- part of the speedometer/odometer gauge assembly.tact on the swing-arm wipes across a resistor coil,which changes sending unit resistance. High sending VOLTMETERunit resistance causes low fuel level readings. Low The voltmeter is connected in parallel with the bat-resistance causes high fuel level readings. Sending tery. With the ignition switch ON, the voltmeter in-unit resistance values are shown in a chart in Spec- dicates battery or generator output voltage,ifications. whichever is greater.OIL PRESSURE GAUGE INDICATOR LAMPS The oil pressure gauge gives an indication of en- Indicator lamps are located in several areas of thegine oil pressure. The oil pressure sending unit con- cluster. All lamps within the cluster are served bytains a flexible diaphragm. The diaphragm moves in the cluster printed circuit and cluster connector.response to changes in engine oil pressure. As the di-aphragm moves, resistance increases or decreases. AIRBAG INDICATOR LAMPHigh resistance in sending unit causes high oil pres- The airbag indicator lamp is switched to ground bysure readings. Low resistance causes low oil pressure the Airbag Control Module (ACM). The lamp lightsreadings. Sending unit resistance values are shown for 6 to 8 seconds each time the ignition switch isin a chart in Specifications. turned to the ON position as a bulb test and to indi- cate a system self-test is in process. If the lamp re-SPEEDOMETER/ODOMETER mains on after the self-test or comes on while The speedometer/odometer gives an indication of driving, it may indicate that the ACM has detected avehicle speed and travel distance. The speedometer system malfunction or that the system has becomereceives a vehicle speed pulse signal from the Vehicle inoperative. Refer to Group 8M - Restraint SystemsSpeed Sensor (VSS). An electronic integrated circuit for more information.contained within the speedometer reads and analyzesthe pulse signal. It then adjusts the ground path re- ANTI-LOCK BRAKE SYSTEM LAMPsistance of one electromagnet in the gauge to control The Anti-Lock Brake System (ABS) lamp isneedle movement. It also sends signals to an electric switched to ground by the ABS module. The modulestepper motor to control movement of the odometer lights the lamp when the ignition switch is turned tonumber rolls. Frequency values for the pulse signal the START position as a bulb test. The lamp willare shown in a chart in Specifications. stay on for 3 to 5 seconds after vehicle start-up to in- The VSS is mounted to an adapter near the trans- dicate a system self-test is in process. If the lamp re-mission or transfer case output shaft. The sensor is mains on after start-up, or comes on and stays ondriven through the adapter by a speedometer pinion while driving, it may indicate that the ABS modulegear. The adapter and pinion vary with transmission,
  3. 3. ZJ INSTRUMENT PANEL AND GAUGES 8E - 3has detected a system malfunction or that the system MASTER LIGHTING INDICATORhas become inoperative. Refer to Group 5 - Brakes This lamp is required for certain export applica-for more information. tions. The lamp is energized when the park lamps or head lamps are operating.BRAKE WARNING LAMP The brake warning lamp warns the driver that the SEAT BELT REMINDER LAMPparking brake is applied or that the pressures in the The seat belt reminder lamp lights for 4 to 8 sec-two halves of the split brake hydraulic system are onds after the ignition switch is turned to the ON po-unequal. With the ignition switch turned ON, battery sition. A timer in the chime/buzzer module controlsvoltage is supplied to one side of the indicator bulb. A ignition-switched battery feed to the lamp. Refer toground path for the bulb is provided by 3 switches. Group 8U - Chime/Buzzer Warning Systems for moreThe bulb will light when: information.• the brake warning switch is closed (indicating un-equal brake system hydraulic pressures possibly due SECURITY LAMPto brake fluid leakage) The security lamp is controlled by the vehicle theft• the ignition switch is in the START position (bulb alarm system. It gives the driver an indication of thetest) status of the theft alarm system. Refer to Group 8Q -• the parking brake switch is closed (parking brake Vehicle Theft Alarm for more information.is applied). Refer to Group 5 - Brakes for more information. TURN SIGNAL INDICATOR LAMPS The left and right turn signal indicator lamps areHAZARD WARNING INDICATOR controlled by the turn signal and hazard warning This lamp is required for certain export applica- (multi-function) switches. One side of the bulb fortions. The lamp is energized when the hazard warn- each lamp is grounded at all times. The other side ofing flasher system is operating. the bulb receives battery feed through the contacts of the multi-function switch when the turn signal leverHEADLAMP HIGH BEAM INDICATOR LAMP (multi-function switch stalk) or hazard warning but- The high beam indicator lamp is controlled by the ton are actuated. Refer to Group 8J - Turn Signalheadlamp dimmer (multi-function) switch. One side and Hazard Warning Systems for more information.of the indicator bulb is grounded at all times. Theother side of the bulb receives battery feed through UPSHIFT INDICATOR LAMPthe contacts of the dimmer switch when the multi- Vehicles equipped with manual transmissions havefunction switch stalk is actuated to turn the head- an optional upshift indicator lamp. Ground feed forlamp high beams on. Refer to Group 8L - Lamps for the lamp is switched by the Powertrain Control Mod-more information. ule (PCM). The lamp lights to indicate when the driver should shift to the next highest gear for bestLOW FUEL WARNING LAMP The low fuel warning lamp will light when the fuel fuel economy. The PCM will turn the lamp off after 3level falls below approximately 4 gallons. One side of to 5 seconds if the upshift is not performed. The lampthe low fuel warning bulb is grounded at all times. A will remain off until the vehicle stops acceleratinglow fuel warning module attached to the rear of the and is brought back to the range of lamp operation,tachometer provides battery voltage to the lamp or until the transmission is shifted into another gear.when the fuel level is low. The low fuel warning mod- The indicator lamp is normally on when the igni-ule receives a signal from the fuel level sending unit tion switch is turned ON and is turned off when thethat is the same signal used for the fuel gauge. engine is started. The lamp will be turned on during vehicle operation according to engine speed and load.MALFUNCTION INDICATOR LAMP The CHECK ENGINE or Malfunction Indicator CLUSTER ILLUMINATION LAMPSLamp (MIL) lights each time the ignition switch is All cluster illumination lamps receive battery feedturned ON, and stays on for 3 seconds as a bulb test. from the instrument lamps fuse in the fuseblockIf the Powertrain Control Module (PCM) receives an module through the instrument panel dimming mod-incorrect signal or no signal from certain fuel or ule and the headlamp switch. When the park oremission system related circuits or components, the headlamps are on, the cluster illumination lampslamp is turned on. This will indicate that the PCM light. Illumination brightness can be adjusted byhas recorded a Diagnostic Trouble Code (DTC) in moving the sliding dimmer switch knob (left to dim,electronic memory for a circuit or component mal- right to brighten). Refer to Body Diagnostic Proce-function. Refer to Group 14 - Fuel System for more dures manual for diagnosis of the instrument panelinformation. lamps dimming module.
  4. 4. 8E - 4 INSTRUMENT PANEL AND GAUGES ZJGRAPHIC DISPLAY MODULE clock function will pulse (unless a door is open and A four-wheel drive Graphic Display Module (GDM) vehicle is at critical speed) continuously at 3 secondis standard equipment on all Grand Cherokee 4WD intervals.models, unless the optional Vehicle Information Cen-ter (described elsewhere in this group) has been se- CONTROLSlected. The module is mounted in the lower center On the right side of the VIC module are the VICarea of the instrument panel, above the ash receiver SET and SELECT buttons. These buttons are used toand below the climate controls. control and customize the VIC display during the ini- The display consists of a back-lit screen with a ve- tial set-up procedure, to enter the VIC into its self-hicle outline, and bulbs that light the four wheels ap- diagnostic mode, and for certain other functions. Thepropriately as determined by the state of a transfer VIC display can also be switched from U.S. custom-case switch to indicate the four-wheel drive system ary to metric measurement using the US/METRICmode of operation. The display also includes up to button in the overhead console. See the VIC Initialthree indicator lamps labeled Part-Time, Full-Time, Set-Up chart in this group, or refer to the vehicleand Lo. Owner’s Manual for more information on the use and The bulbs, wiring, and transfer case switches are operation of the VIC controls.available for service. However, if the GDM screen, CLOCK/CALENDAR DISPLAYhousing or internal circuitry are damaged or faulty The clock/calendar function will be displayed dur-the entire module must be replaced. ing normal vehicle operation, unless a warning or service system fault is detected. The clock/calendarVEHICLE INFORMATION CENTER display will include the following: The Vehicle Information Center (VIC) is an avail- • time (hours and minutes with AM and PM, exceptable option on Grand Cherokee models. The VIC con- 24 hour clock mode)sists of multi-colored vacuum-fluorescent display • day of week (Monday through Sunday)screen with a vehicle outline. It is mounted in the • date (month and day).lower center area of the instrument panel, above theash receiver and below the climate controls. The VIC OPERATING SYSTEMS MONITORreplaces the standard equipment Graphic Display The VIC monitors 11 vehicle operating systems.Module (GDM), which is covered elsewhere in this The specific vehicle operating systems monitored bygroup. The VIC module can not be repaired. If faulty the VIC are:or damaged, the entire module must be replaced. • right front door ajar switch The VIC is able to display four functions in a • left front door ajar switchchoice of five languages (English, French, German, • right rear door ajar switchItalian or Spanish) and using U.S. or metric mea- • left rear door ajar switchsurements. These functions include: • liftgate/flipper glass ajar switch• display the current time, day, and date • rear lamp outage module• monitor specific vehicle operating systems and • turn signal systemalert the driver if a malfunction occurs • washer fluid level sensor• display a service reminder or the distance to the • coolant level sensornext service interval • electrical system voltage• display the selected 4WD transfer case mode of op- • 4WD transfer case switch.eration. If a fault is detected in any of these systems, an When the ignition switch is turned ON, the module area of the vehicle display outline will illuminate andwill display a MILES (KM)-TO-SERVICE message a message will be displayed. To alert the driver, anfor 6 seconds. If the distance remaining to service is audible warning signal (beeps) will occur the firstzero, the module will instead display a PERFORM time the message appears as indicated in the follow-SERVICE message for 11 seconds. Then an audible ing paragraphs.alarm will pulse 6 sequences of warning beeps. ThePERFORM SERVICE message will continue for an DOOR AJAR/LIFTGATE OPENadditional 2 seconds. These messages are displayed when a door jamb or Next, if no monitored system faults exist and the liftgate/flipper glass ajar switch is grounded (closed).time/date has been previously set, the module will For the left front door only, when the door is opendisplay the current time and date. If a service fault and the vehicle speed is greater that 10 MPH, theexists, the module will begin to display the fault mes- audible signal will sound. This same warning will besage. If more than one message has to be displayed, sounded when the right front or either rear door isthe module will display up to 2 messages. Then the open, and the vehicle speed is greater that 2 MPH.
  5. 5. ZJ INSTRUMENT PANEL AND GAUGES 8E - 5REAR LAMP FAILURE PERFORM SERVICE This message is displayed when the lamp outage This message is displayed at ignition ON any timemodule input is open for 1/2 second. This display is the distance-to-service counter is equal to zero.latched on until the ignition switch is cycled to OFFand ON, following correction. XXXX MILES (KM)-TO-SERVICE This message is displayed at ignition ON or whenTURN SIGNAL ON SELECT is pressed after the time/date has been set. This message is turned on if 1 mile has elapsed The distance-to-service counter must not equal zerowith a turn signal left on. for the message to display. The distance is expressed in MILES or KILOMETERS (km) depending on theCHECK BATTERY state of the US/METRIC switch in the overhead con- This message is turned on when the ignition volt- sole.age is not between 11.5 and 15.1 volts. The reading ischecked every 15 seconds for an over or under bat- COOLANT LEVEL SENSOR BADtery voltage. It takes 2 consecutive 15 second average The module displays a Coolant Sensor Bad mes-readings to turn the message on and 1 average read- sage as part of the warning message when it detectsing to remove it. an open or short circuit to the coolant level sensor. See VIC Fluid Level Fault Diagnosis chart in thisWASHER FLUID LOW group for more information. This message is turned on when the signal fromthe washer fluid level sensor indicates a low fluid WASHER SENSOR BADcondition. It takes 30 consecutive low averaged sam- The module displays a Washer Sensor Bad messageples to determine the washer fluid level is low. This as part of the warning message when it detects andisplay is latched on until the ignition switch is cy- open or short circuit to the washer fluid level sensor.cled to OFF and ON, following correction. See VIC Fluid Level Fault Diagnosis chart in this group for more information.COOLANT LEVEL LOW The module will test the coolant level sensor input FOUR-WHEEL DRIVE DISPLAYimmediately after ignition ON and determine if there The VIC will light the wheels of the vehicle outlineis a fault. Thereafter, the input is checked every 1 and nomenclature as outlined in the VIC 4WD Dis-second. It takes 30 consecutive low averaged samples play Characteristics chart in this group.to determine the coolant level is low. This display islatched on until the ignition switch is cycled to OFF VIC SELF-DIAGNOSTICSand ON, following correction. The module will perform certain self-tests without the use of special tools. See VIC Self-Diagnosis chartSERVICE REMINDERS in this group for more information. The VIC program The VIC system includes a distance-to-service will stay in self-diagnostics mode until all the testscounter and detects faulty sensors. See the VIC Reset pass or the ignition switch is turned OFF.Procedures chart in this group for information on re- The self-diagnostic routine is able to perform thesetting the distance-to-service counter. See the VIC following checks:Initial Set-Up chart in this group for information on • microcomputer ram/rom/timer testsetting the desired service interval. The following • display screen testparagraphs describe the service messages that will • coolant/washer/rear lamp/four-wheel drive sensorbe displayed if a fault is detected. input tests.
  6. 6. 8E - 6 INSTRUMENT PANEL AND GAUGES ZJ DIAGNOSISGAUGES If an individual gauge is inoperative, see the diag-nostic procedure under the heading for that gauge. Ifmore than one gauge is inoperative, perform the fol-lowing: (1) Check fuse 22 in the fuseblock module. If OK,go to next step. If not OK, replace fuse. (2) Check for battery voltage at fuse 22 with igni-tion switch in ON position. If OK, go to next step. Ifnot OK, repair open in circuit from ignition switchand/or refer to Group 8D - Ignition Systems for test-ing of ignition switch. (3) Turn ignition switch to OFF. Disconnect batterynegative cable. Remove dash pad and cluster assem-bly. Disconnect printed circuit connector. (4) Connect battery negative cable. Turn ignitionswitch to ON. Check for battery voltage at cavity C12 Fig. 1 Coolant Temperature Sending Unit - 4.0Lof printed circuit connector. If OK, go to next step. If Enginenot OK, repair open in circuit from fuse as required. (5) Turn ignition switch to OFF. Disconnect batterynegative cable. Probe ground cavity of printed circuitconnector. Check for continuity to a good ground.There should be continuity. If OK, replace printedcircuit. If not OK, repair open circuit to ground as re-quired.COOLANT TEMPERATURE GAUGE The diagnosis found here addresses an inoperativegauge condition. If the problem being diagnosed is re-lated to gauge accuracy, be certain to confirm thatproblem is with gauge and not with cooling systemperformance. Actual engine coolant temperatureshould be checked with a test gauge or thermometerand compared to gauge readings before you proceedwith gauge diagnosis. Refer to Group 7 - Cooling Sys- Fig. 2 Coolant Temperature Sending Unit - 5.2Ltem for more information. Engine (1) Turn ignition switch to ON. Disconnect coolanttemperature sending unit connector (Fig. 1 or 2). The FUEL GAUGEgauge needle should move to low end of gauge scale. The diagnosis found here addresses an inoperativeIf OK, go to next step. If not OK, go to step 3. gauge condition. If the problem being diagnosed is re- (2) Install a jumper wire from sending unit wiring lated to gauge accuracy, be certain to confirm thatto ground. The gauge needle should move to high end problem is with gauge and not with fuel tank. In-of gauge scale. If OK, replace sending unit. If not spect fuel tank for signs of damage or distortion thatOK, remove jumper wire and go to next step. could affect sending unit performance before you pro- (3) Turn ignition switch to OFF. Disconnect battery ceed with gauge diagnosis. Refer to Group 14 - Fuelnegative cable. Remove dash pad and cluster assem- System for more information.bly. Disconnect printed circuit connector. (1) Turn ignition switch to ON. Disconnect fuel (4) Probe cavity D11 of printed circuit connector. gauge sending unit connector. Connector is located onCheck for continuity to a good ground. There should top of the fuel tank. The gauge needle should movebe no continuity. If OK, go to next step. If not OK, to low end of gauge scale. If OK, go to next step. Ifrepair short in circuit as required. not OK, go to step 4. (5) Still probing cavity D11 of printed circuit con- (2) Connect a jumper wire between sending unitnector, check for continuity to sending unit wiring connector cavity 2 and cavity 3 (Fig. 3) in the bodyconnector. There should be continuity. If OK, replace half of the fuel gauge sending unit connector. Thegauge. If not OK, repair open in circuit as required. gauge needle should move to high end of gauge scale.
  7. 7. ZJ INSTRUMENT PANEL AND GAUGES 8E - 7If OK, refer to Group 14 - Fuel System for procedureto replace sending unit. If not OK, remove jumperwire and go to next step. Fig. 4 Oil Pressure Sending Unit - 4.0L Engine Fig. 3 Fuel Gauge Sending Unit Connector (3) Turn ignition switch to OFF. Disconnect batterynegative cable. Check for continuity between fuelgauge sending unit connector cavity 2 in the bodyhalf of connector and a good ground. There should becontinuity. If OK, go to next step. If not OK, repaircircuit to ground as required. (4) Remove dash pad and cluster assembly. Discon-nect printed circuit connector. Fig. 5 Oil Pressure Sending Unit - 5.2L Engine (5) Probe cavity D6 of printed circuit connector. (2) Install a jumper wire from sending unit wireCheck for continuity to a good ground. There should connector to ground. The gauge needle should movebe no continuity. If OK, go to next step. If not OK, to low end of gauge scale. If OK, replace sendingrepair short circuit as required. unit. If not OK, remove jumper wire and go to next (6) Still probing cavity D6 of printed circuit con- step.nector, check for continuity to fuel gauge sending (3) Turn ignition switch to OFF. Disconnect batteryunit connector cavity 3. There should be continuity. If negative cable. Remove dash pad and cluster assem-OK, replace gauge. If not OK, repair open circuit as bly. Disconnect printed circuit connector.required. (4) Probe cavity C9 of printed circuit connector andOIL PRESSURE GAUGE check for continuity to a good ground. There should The diagnosis found here addresses an inoperative be no continuity. If OK, go to next step. If not OK,gauge condition. If the problem being diagnosed is re- repair short circuit as required.lated to gauge accuracy, be certain to confirm that (5) Still probing cavity C9 of printed circuit con-problem is with gauge and not with engine oiling sys- nector, check for continuity to sending unit wire con-tem performance. Actual engine oil pressure should nector. There should be continuity. If OK, replacebe checked with a test gauge and compared to gauge gauge. If not OK, repair open circuit as required.readings before you proceed with gauge diagnosis.Refer to Group 9 - Engines for more information. SPEEDOMETER/ODOMETER (1) Turn ignition switch to ON. Disconnect oil pres- The diagnosis found here addresses an inoperativesure sending unit connector (Fig. 4 or 5). The gauge gauge condition. If the problem being diagnosed is re-needle should move to high end of gauge scale. If OK, lated to gauge accuracy, be certain to confirm thatgo to next step. If not OK, go to step 3. problem is with gauge and not with incorrect speed-
  8. 8. 8E - 8 INSTRUMENT PANEL AND GAUGES ZJometer pinion, axle ratio or tire size. Refer to Group21 - Transmission and Transfer Case for more infor-mation. (1) Perform vehicle speed sensor test as describedin the appropriate Powertrain Diagnostic Proceduresmanual. If OK, go to next step. If not OK, replace ve-hicle speed sensor. (2) Disconnect battery negative cable. Unplug vehi-cle speed sensor, PCM, vehicle information center (ifequipped), and transmission control module (ifequipped) connectors. Remove dash pad and clusterassembly. Disconnect printed circuit connector. (3) Probe cavity C7 of printed circuit connector.Check for continuity to a good ground. There shouldbe no continuity. If OK, go to next step. If not OK,repair short circuit as required. (4) Still probing cavity C7 of printed circuit con-nector, check for continuity to cavity 1 of vehiclespeed sensor connector (Fig. 6). There should be con-tinuity. If OK, replace speedometer/odometer. If notOK, repair open circuit as required. Fig. 7 Powertrain Control Module Connector TRIP ODOMETER If the trip odometer is inoperative, but the speed- ometer/odometer functions are unaffected, replace speedometer assembly. If speedometer/odometer func- tions are affected, see Speedometer/Odometer diagno- sis in this section. VOLTMETER (1) Turn ignition switch to ON. Voltmeter should read battery voltage. If all gauges except voltmeter are OK, go to next step. If other gauges are inopera- tive, see Gauges in this section for diagnosis. (2) Using an accurate test voltmeter, measure bat- tery voltage at battery. Compare this reading to in- strument cluster voltmeter reading. Now see Fig. 6 Vehicle Speed Sensor Connector Voltmeter Calibration chart in Specifications. If volt-TACHOMETER meter does not perform to specification, replace volt- (1) With engine running, check for tachometer sig- meter.nal at pin 43 of PCM connector (Fig. 7). See Tachom-eter Calibration chart in Specifications. If OK, go to INDICATOR LAMPSnext step. If not OK, replace PCM. If an individual indicator lamp is inoperative, see (2) Disconnect battery negative cable. Unplug PCM the diagnostic procedure under the heading for thatconnector. Remove dash pad and cluster assembly. lamp. If more than one indicator lamp or a combina-Disconnect printed circuit and transmission control tion of lamps and gauges in the instrument cluster ormodule (if equipped) connectors. message center is inoperative, see Gauges in this sec- (3) Probe cavity D5 of printed circuit connector. tion for diagnosis.Check for continuity to a good ground. There shouldbe no continuity. If OK, go to next step. If not OK, AIRBAG INDICATOR LAMPrepair short circuit as required. (1) Remove dash pad and cluster assembly. Do not (4) Still probing cavity D5 of printed circuit con- unplug cluster connector.nector, check for continuity to cavity 43 of PCM con- (2) Turn ignition switch to ON position. Ground in-nector. There should be continuity. If OK, replace strument cluster connector pin C11. Lamp shouldtachometer. If not OK, repair open circuit as re- light. If OK, go to next step. If not OK, replace bulb.quired.
  9. 9. ZJ INSTRUMENT PANEL AND GAUGES 8E - 9 INSTRUMENT CLUSTER
  10. 10. 8E - 10 INSTRUMENT PANEL AND GAUGES ZJ (3) Turn ignition switch to OFF position. Discon- (2) Remove dash pad and instrument cluster. Re-nect and isolate the battery negative (ground) cable. place low fuel warning bulb. Test operation. If notCheck for continuity between connector pin C11 and OK, replace low fuel warning module.pin 3 of the airbag control module (ACM) connector. The low fuel warning module is serviced asThere should be continuity. If OK, refer to Group 8M part of the tachometer assembly. If faulty, re-- Restraint Systems for diagnosis of ACM. If not OK, place the tachometer.repair open circuit as required. MALFUNCTION INDICATOR LAMPANTI-LOCK BRAKE SYSTEM LAMP The diagnosis found here addresses an inoperative The diagnosis found here addresses an inoperative lamp condition. If the lamp comes on and stays onlamp condition. If the ABS lamp stays on with the ig- with engine running, refer to Group 14 - Fuel Systemnition switch in the ON position, or comes on and for diagnosis. If no fuel or emission system problemstays on while driving, refer to Group 5 - Brakes for is found, the following procedure will help locate adiagnosis. If no ABS problem is found, the following short or open in the lamp circuit.procedure will help locate a short or open in the ABS (1) Disconnect battery negative cable. Unplug PCMlamp circuit. connector. Install a jumper wire between cavity 32 of (1) Turn ignition switch to ON. PCM connector (Fig. 8) and a good ground. Connect (2) Jump instrument cluster connector terminal C3 battery negative cable. Turn ignition switch to ON.to ground. Lamp should light. If bulb is OK, check Lamp should light. Remove jumper wire and lamp should go OFF. If OK, refer to Powertrain Diagnosticfor continuity between C3 and the ABS module con- Procedures to check PCM. If not OK, go to next step.nector. Refer to Group 5 - Brakes. (2) Turn ignition switch to OFF. Disconnect batteryBRAKE WARNING LAMP The diagnosis found here addresses an inoperativelamp condition. If the brake warning lamp stays onwith the ignition switch in the ON position and theparking brake released, refer to Group 5 - Brakes fordiagnosis. If no service brake or parking brake prob-lem is found, the following procedure will help locatea short circuit or faulty switch. (1) Turn ignition switch to START position. Lampshould light. Release ignition switch to ON position.Lamp should go OFF. If not OK, go to next step. (2) Jump cluster connector terminal C4 to ground.Lamp should light. If bulb is OK, check for continuityto brake pressure warning switch and park brakeswitch.HEADLAMP HIGH BEAM INDICATOR LAMP (1) Check that headlamp high beams are func-tional. If OK, go to next step. If not OK, refer toGroup 8L - Lamps for diagnosis of headlamp system. (2) Disconnect battery negative cable. Removedash pad and cluster assembly. Unplug printed cir- Fig. 8 Powertrain Control Module Connectorcuit connector. Connect battery negative cable. Turnheadlamps on and select high beam. Check for bat- negative cable. Remove dash pad and cluster assem- bly. Install a jumper wire between cavity C5 oftery voltage at cavity C13 of printed circuit connec- printed circuit connector and a good ground. Connecttor. If OK, replace indicator bulb. If not OK, refer to battery negative cable. Turn ignition switch to ON.Body Diagnostic Procedures manual for diagnosis of Lamp should light. If OK, go to next step. If not OK,instrument panel lamps dimming module. replace bulb. (3) Turn ignition switch to OFF. Disconnect batteryLOW FUEL WARNING LAMP negative cable. Unplug printed circuit connector. (1) Perform diagnosis for fuel gauge. The fuel Check for continuity between cavity C5 of printed cir-gauge and low fuel warning lamp use the same cir- cuit connector and a good ground. There should be nocuit and sending unit. If wiring and sending unit are continuity. If OK, go to next step. If not OK, repairOK, go to next step. If not OK, repair as required. short circuit to PCM as required.
  11. 11. ZJ INSTRUMENT PANEL AND GAUGES 8E - 11 (4) Check continuity between cavity C5 of printed light. Remove jumper from ground. Lamp should gocircuit connector and cavity 32 of PCM connector. off. If OK, refer to Powertrain Diagnostic ProceduresThere should be continuity. If not OK, repair open manual to diagnose PCM. If not OK, turn ignitioncircuit to PCM as required. switch to OFF and go to next step. (2) Disconnect battery negative cable. RemoveSEAT BELT REMINDER LAMP dash pad and cluster assembly. Install a jumper wire (1) Refer to Group 8U - Chime/Buzzer Warning from cavity C8 of cluster connector to a good ground.Systems to check chime/buzzer module operation. If Connect battery negative cable. Turn ignition switchOK, go to next step. If not OK, replace chime/buzzer to ON. Lamp should light. If OK, go to next step. Ifmodule. not OK, replace bulb. (2) Disconnect battery negative cable. Remove (3) Turn ignition switch to OFF. Disconnect batterydash pad and cluster assembly. Install a jumper wire negative cable. Unplug cluster connector. Check forbetween cavity C14 of printed circuit connector and continuity between cavity C8 of cluster connector and12 volts. Bulb should light. If OK, repair circuit to a good ground. There should be no continuity. If OK,chime/buzzer module. If not OK, replace bulb. go to next step. If not OK, repair short circuit as re-SECURITY LAMP quired. (1) Remove dash pad and cluster assembly. Do not (4) Check for continuity between cavity C8 of clus-unplug cluster connector. ter connector and cavity 54 of PCM connector. There (2) Jump cluster connector terminal D16 to should be continuity. If not OK, repair open circuit asground. Lamp should light. If OK, check circuit to ve- required.hicle theft alarm module. If not OK, replace bulb. CLUSTER ILLUMINATION LAMPSTURN SIGNAL INDICATOR LAMPS (1) Check fuse 24 in fuseblock module. If OK, go to (1) Disconnect battery negative cable. Remove next step. If not OK, replace fuse.dash pad and cluster assembly. Probe cavity D8 of (2) Remove dash pad and cluster assembly. Installprinted circuit connector. Check for continuity to a a jumper wire from cluster connector cavity D12 to agood ground. There should be continuity. If OK, go to 12-volt battery feed. Lamps should light. If OK, refernext step. If not OK, repair open circuit to ground. to Body Diagnostic Procedures manual for diagnosis (2) Connect battery negative cable. Install a of instrument panel lamps dimming module. If notjumper wire from cavity D2 (left indicator) or cavity OK, replace bulbs.C16 (right indicator) of printed circuit connector to a12-volt battery feed. Lamp should light. If OK, con- GRAPHIC DISPLAY MODULEtinue to next step. If not OK, replace bulb. If part of the GDM will not light or is not operating (3) Disconnect battery negative cable. Check for properly, use the Graphic Display Module Schematiccontinuity between cavity D2 (left indicator) or cavity and Group 8 - Wiring Diagrams to check circuit con-C16 (right indicator) of printed circuit connector and tinuity between the GDM connector and the appro-left front turn signal or right front turn signal wir- priate signal source. If there is continuity and theing. There should be continuity. If OK, refer to Group sending device is operating properly, replace the8J - Turn Signal and Hazard Warning Systems for GDM unit.further diagnosis. If not OK, repair open circuit asrequired. VEHICLE INFORMATION CENTER Problems with the VIC module can be diagnosedUPSHIFT INDICATOR LAMP using a combination of the diagnostic charts and (1) Disconnect battery negative cable. Unplug PCM schematics that follow. Also included are charts de-connector. Connect battery negative cable. Turn igni- scribing the procedures for initial VIC set-up and re-tion switch to ON. Install a jumper wire from cavity setting of the VIC clock/calendar and service54 of PCM connector to a good ground. Lamp should reminder functions.
  12. 12. 8E - 12 INSTRUMENT PANEL AND GAUGES ZJ GRAPHIC DISPLAY MODULE SCHEMATIC VIC DIAGNOSTIC MESSAGES
  13. 13. ZJ INSTRUMENT PANEL AND GAUGES 8E - 13 VIC SELF-DIAGNOSIS
  14. 14. 8E - 14 INSTRUMENT PANEL AND GAUGES ZJ VIC FLUID LEVEL FAULT DIAGNOSIS
  15. 15. ZJ INSTRUMENT PANEL AND GAUGES 8E - 15 VIC REAR LAMP FAULT DIAGNOSIS
  16. 16. 8E - 16 INSTRUMENT PANEL AND GAUGES ZJ VIC 4WD DISPLAY FAULT DIAGNOSIS
  17. 17. ZJ INSTRUMENT PANEL AND GAUGES 8E - 17 VIC SYSTEM SCHEMATIC
  18. 18. 8E - 18 INSTRUMENT PANEL AND GAUGES ZJ VIC CONNECTOR 4WD SWITCH STATES LAMP OUTAGE MODULE CONNECTOR VIC 4WD DISPLAY CHARACTERISTICS DRIVE SYSTEM VIC 4WD DISPLAY TRANSFER CASE SHIFT LEVER POSITION (TRANSFER CASE) CHARACTERISTICS 2WD 4 PART TIME 4 FULL/ALL TIME NEUTRAL 4 LO 4WD QUADRA-TRAC Nomenclature N/A N/A None None ‘‘LO’’ (NP249) Lighted Wheels N/A N/A All None All 4WD SELEC-TRAC Nomenclature None ‘‘PART TIME’’ ‘‘FULL TIME’’ None ‘‘PART TIME’’ (NP242) Lighted Wheels Rear All All None All 4WD COMMAND- TRAC Nomenclature None ‘‘PART TIME’’ N/A None ‘‘PART TIME’’ (NP231) Lighted Wheels Rear All N/A None All 2WD Nomenclature None N/A N/A N/A N/A (NONE) Lighted Wheels None N/A N/A N/A N/AN/A=Not Applicable J958E-42
  19. 19. ZJ INSTRUMENT PANEL AND GAUGES 8E - 19 VIC INITIAL SET-UP
  20. 20. 8E - 20 INSTRUMENT PANEL AND GAUGES ZJ VIC RESET PROCEDURES
  21. 21. ZJ INSTRUMENT PANEL AND GAUGES 8E - 21 TRANSFER CASE SWITCHESTRANSFER CASE SWITCHES propriate transfer case. If switch is OK, see diagnosis The transfer case switches used for the GDM and for the GDM or VIC in this group, as required. Referthe VIC are the same. See the Transfer Case to Group 21 - Transmission and Transfer Case forSwitches chart to check switch operation for the ap- switch service procedures.
  22. 22. 8E - 22 INSTRUMENT PANEL AND GAUGES ZJ SERVICE PROCEDURESINSTRUMENT CLUSTER REMOVE/INSTALL (1) Disconnect battery negative cable. (2) Remove ash receiver. (3) Remove 6 screws holding center cluster bezel(Fig. 9). Fig. 10 Upper Dash Pad Attaching Screws Fig. 11 Remove Screws Holding Dash Pad Fig. 9 Center Bezel Retaining Screws (4) Remove center bezel. (5) Remove 2 screws that were behind center bezel Fig. 12 Instrument Cluster Attaching Screwsholding dash pad. (14) Reverse removal procedures to install. (6) Gently pry defroster grille out of dash pad. (7) Unplug auto headlamp and sun sensors (if GAUGES REMOVE/INSTALLequipped) and set defroster grille aside. (1) Remove instrument cluster as described in In- (8) Remove 4 screws in defroster duct opening strument Cluster Remove/Install.holding dash pad (Fig. 10). (2) Remove 4 screws from bottom of lens and lift (9) Remove 3 screws above instrument panel clus- lens off from bottom (Fig. 13).ter holding dash pad (Fig. 11). (3) Pull off trip odometer reset knob. (10) Open glove box and remove 2 screws holding (4) Remove mask by lifting from bottom. Mask isdash pad. snapped in along the top. (11) Remove dash pad by pulling up to unsnap endclips. CAUTION: Do not touch the face of a gauge or the (12) Remove 3 screws from the top of the cluster back of the lens with your finger. It will leave a per-(Fig. 12). manent finger print. (13) Lift cluster straight up far enough to allow ac- (5) Remove the required gauge set attachingcess to connector. Unplug connector and remove clus- screws from the rear of mounting bezel (Fig. 14). Re-ter. move coolant temperature/oil pressure or voltmeter/
  23. 23. ZJ INSTRUMENT PANEL AND GAUGES 8E - 23 Fig. 13 Instrument Cluster
  24. 24. 8E - 24 INSTRUMENT PANEL AND GAUGES ZJ Fig. 14 Printed Circuit Remove/Installfuel gauge set from front. Remove tachometer withprinted circuit or speedometer/odometer with printedcircuit from the back. (6) Reverse removal procedures to install.PRINTED CIRCUIT REMOVE/INSTALL (1) Remove instrument cluster as described in In-strument Cluster Remove/Install. (2) Remove 4 screws from bottom of lens and liftlens off from bottom. (3) Pull off trip odometer reset knob. (4) Remove mask by lifting from bottom. Mask issnapped in along the top.CAUTION: Do not touch the face of a gauge or theback of the lens with your finger. It will leave a per-manent finger print. (5) Remove all attaching screws for gauges, ta-chometer, and speedometer that are contacting theprinted circuit (Fig. 14). (6) Remove 2 screws holding the cluster connector Fig. 15 Cluster Connector Retaining Screwsto the bezel (Fig. 15). (7) Remove the lamp sockets from the circuit (9) Reverse the removal procedures to install.board. (8) Lift the connector up to unfold the printed cir- SWITCH PODS REMOVE/INSTALLcuit (Fig. 16). Remove the printed circuit including (1) Disconnect battery negative cable.the connector. (2) Remove ash receiver.
  25. 25. ZJ INSTRUMENT PANEL AND GAUGES 8E - 25 (5) Remove 2 screws holding dash pad located be- hind top of center bezel. (6) Gently pry defroster grille out of dash pad. (7) Unplug automatic headlamp and sun sensors (if equipped) and set defroster grille aside. (8) Remove 4 screws in defroster duct opening holding dash pad (Fig. 18). Fig. 18 Upper Dash Pad Attaching Screws (9) Remove 3 screws above instrument panel clus- ter holding dash pad (Fig. 19). Fig. 16 Printed Circuit and Cluster Connector (3) Remove 6 screws holding center cluster bezel(Fig. 17). Fig. 19 Remove Screws Holding Dash Pad (10) Open glove box and remove 2 screws holding dash pad. (11) Remove dash pad by pulling up to unsnap end clips. Fig. 17 Center Bezel Retaining Screws (4) Remove center bezel.
  26. 26. 8E - 26 INSTRUMENT PANEL AND GAUGES ZJ (12) With left front door open, remove 1 screw fromthe side of the lower trim panel (Fig. 20). Fig. 22 Remove Screws Holding Bottom Of Bezels (18) Remove 2 screws holding top of end and switch pod bezels (Fig. 23). The end bezel can now be removed. Fig. 20 Lower Trim Panel (13) Remove 4 screws holding the steering columncover (Fig. 21). Fig. 23 Remove Screws Holding Top Of Bezels Fig. 21 Steering Column Cover and Knee Blocker (14) Remove 1 screw from bottom of lower trimpanel and pull panel off. There is also a clip holdingthe panel to the instrument panel. (15) Remove 6 screws holding knee blocker. (16) Remove steering column retaining nuts. (17) Remove 3 screws holding bottom of bezels(Fig. 22).
  27. 27. ZJ INSTRUMENT PANEL AND GAUGES 8E - 27(19) Remove 2 screws holding left side of switch podbezel (Fig. 24). Fig. 25 Right Switch Pod Bezel Screws Fig. 24 Left Switch Pod Bezel Screws (20) Remove 3 screws holding right side of switchpod bezel (Fig. 25). (21) Pull switch pod bezel out far enough to re-move switch connectors. Disconnect connectors fromeach switch pod and remove bezel (Fig. 26). Fig. 26 Rear View of Switch Pod Bezel
  28. 28. 8E - 28 INSTRUMENT PANEL AND GAUGES ZJ (22) Remove required switch attaching screws and GDM/VIC REMOVE/INSTALLswitch. (1) Disconnect battery negative cable. (23) Reverse removal procedures to install. Tighten (2) Remove ash receiver.steering column retaining nuts to 105 in. lbs. (12 (3) Remove 6 screws holding center cluster bezelN⅐m). (Fig. 29). Fig. 27 Rear View of Left Switch Pod Fig. 29 Remove Center Bezel Retaining Screws (4) Remove center bezel. (5) Remove 3 screws holding GDM/VIC (Fig. 30). (6) Pull module out far enough to unplug connec- tor. Remove module. Fig. 28 Rear View of Right Switch Pod Fig. 30 Module Attaching Screws
  29. 29. ZJ INSTRUMENT PANEL AND GAUGES 8E - 29COOLANT LEVEL SENSOR REMOVE/INSTALL WASHER FLUID LEVEL SENSOR REMOVE/ INSTALL SPECIFICATIONS

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