Exj 8 r

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Exj 8 r

  1. 1. XJ POWER SEAT SYSTEMS 8R - 1 POWER SEAT SYSTEMS CONTENTS page pageGENERAL INFORMATION POWER SEAT ADJUSTER AND MOTORS ..... 2 INTRODUCTION . . . . . . . . . . . . . . . . . . . ..... 1 POWER SEAT SWITCH . . . . . . . . . . . . . . ..... 2DESCRIPTION AND OPERATION POWER SEAT SYSTEM . . . . . . . . . . . . . . ..... 2 CIRCUIT BREAKER . . . . . . . . . . . . . . . . . ..... 2 REMOVAL AND INSTALLATION POWER SEAT ADJUSTER AND MOTORS ..... 1 POWER SEAT ADJUSTER AND MOTORS ..... 3 POWER SEAT SWITCH . . . . . . . . . . . . . . ..... 1 POWER SEAT SWITCH . . . . . . . . . . . . . . ..... 2DIAGNOSIS AND TESTING CIRCUIT BREAKER . . . . . . . . . . . . . . . . . ..... 2GENERAL INFORMATION or faulty, the entire power seat switch module must be replaced.INTRODUCTION A six-way driver side power seat is an available POWER SEAT ADJUSTER AND MOTORSfactory-installed option for Left-Hand Drive (LHD) There are three reversible motors that operate theversions of this model. The power seat system power seat adjuster. The motors are connected toreceives battery feed through a fuse in the Power worm-drive gearboxes that move the seat adjusterDistribution Center and a circuit breaker in the junc- through a combination of screw-type drive units.tion block at all times. The front and rear of a seat are operated by differ- Following are general descriptions of the major ent motors. They can be raised or lowered indepen-components in the power seat system. Refer to 8W-63 dently of each other. When the center seat switch is- Power Seat in Group 8W - Wiring Diagrams for pushed to the Up or Down position, both the frontcomplete circuit descriptions and diagrams. and rear motors operate in unison, moving the entire seat up or down. The forward-rearward motor isNOTE: This group covers both Left-Hand Drive operated by pushing the center seat switch to the(LHD) and Right-Hand Drive (RHD) versions of this Forward or Rearward position.model. Whenever required and feasible, the RHD When a switch is actuated, a battery feed and aversions of affected vehicle components have been ground path are applied through the switch contactsconstructed as mirror-image of the LHD versions. to the motor(s). The motor(s) and drives operate toWhile most of the illustrations used in this group move the seat in the selected direction until therepresent only the LHD version, the diagnostic and switch is released, or until the travel limit of theservice procedures outlined can generally be power seat adjuster is reached. When the switch isapplied to either version. Exceptions to this rule moved in the opposite direction, the battery feed andhave been clearly identified as LHD or RHD, if a ground path to the motor(s) are reversed through thespecial illustration or procedure is required. switch contacts. This causes the motor to run in the opposite direction. Each motor contains a self-resetting circuit breaker to protect it from overload. Consecutive or frequentDESCRIPTION AND OPERATION resetting of the circuit breakers must not be allowed to continue, or the motors may be damaged. MakePOWER SEAT SWITCH the necessary repairs. The power seat can be adjusted in six different The power seat adjuster and motors cannot beways using the power seat switch. The switch is repaired, and are serviced only as a complete unit. Iflocated on the lower outboard side of the seat cushion any component in this unit is faulty or damaged, theframe. Refer to the owner’s manual for more informa- entire power seat adjuster and motors assembly musttion on power seat switch functions and seat adjust- be replaced.ing procedures. The individual switches in the power seat switchmodule cannot be repaired. If one switch is damaged
  2. 2. 8R - 2 POWER SEAT SYSTEMS XJDESCRIPTION AND OPERATION (Continued)CIRCUIT BREAKER (1) Test the circuit breaker in the junction block as An automatic resetting circuit breaker in the junc- described in this group. If OK, go to Step 2. If nottion block is used to protect the power seat system OK, replace the faulty circuit breaker.circuit. The circuit breaker can protect the system (2) Remove the power seat switch as described infrom a short circuit, or from an overload condition this group. Check for battery voltage at the fusedcaused by an obstructed or stuck seat adjuster. B(+) circuit cavity of the power seat switch wire har- The circuit breaker cannot be repaired and, if ness connector. If OK, go to Step 3. If not OK, repairfaulty or damaged, it must be replaced. the open circuit to the junction block as required. (3) Check for continuity between the ground cir- cuit cavity of the power seat switch wire harness con-DIAGNOSIS AND TESTING nector and a good ground. There should be continuity. If OK, go to Step 4. If not OK, repair thePOWER SEAT SYSTEM open circuit to ground as required. Before any testing of the power seat system is (4) Test the power seat switch as described in thisattempted, the battery should be fully-charged and group. If the switch tests OK, check the wire harnessall wire harness connections and pins cleaned and for the inoperative motor between the switch and thetightened to ensure proper continuity and grounds. motor for shorts or opens. If the circuits check OK,For circuit descriptions and diagrams, refer to 8W-63 replace the faulty power seat adjuster and motors- Power Seat in Group 8W - Wiring Diagrams. assembly. If the circuits are not OK, repair the wire With the dome lamp on, apply the power seat harness as required.switch in the direction of the failure. If the domelamp dims, the seat may be jamming. Check under POWER SEAT SWITCHand behind the seat for binding or obstructions. If For circuit descriptions and diagrams, refer tothe dome lamp does not dim, proceed with testing of 8W-63 - Power Seat in Group 8W - Wiring Diagrams.the individual components and circuits. (1) Remove the power seat switch as described in this group.CIRCUIT BREAKER (2) Use an ohmmeter to test the continuity of the For circuit descriptions and diagrams, refer to switches in each position. See the Power Seat Switch8W-63 - Power Seat in Group 8W - Wiring Diagrams. Continuity chart (Fig. 1). If OK, see the diagnosis for (1) Locate the correct circuit breaker in the junc- the Power Seat Adjuster and Motors in this group. Iftion block. Pull out the circuit breaker slightly, but not OK, replace the faulty power seat switch module.be sure that the terminals still contact the terminalsin the junction block cavities. (2) Connect the negative lead of a 12-volt DC volt- REMOVAL AND INSTALLATIONmeter to a good ground. (3) With the voltmeter positive lead, check both POWER SEAT SWITCHterminals of the circuit breaker for battery voltage. (1) Disconnect and isolate the battery negative If only one terminal has battery voltage, the circuit cable.breaker is faulty and must be replaced. If neither ter- (2) Remove the three screws that secure the seatminal has battery voltage, repair the open circuit side shield to the outboard seat cushion frame.from the Power Distribution Center (PDC) as (3) Pull the seat side shield away from the seatrequired. cushion frame far enough to access the power seat switch wire harness connector.POWER SEAT ADJUSTER AND MOTORS (4) Unplug the power seat switch wire harness For circuit descriptions and diagrams, refer to connector from the switch.8W-63 - Power Seat in Group 8W - Wiring Diagrams. (5) Remove the seat side shield from the vehicle. Operate the power seat switch to move all three (6) Remove the two screws that secure the powerseat motors. The seat should move in each selected seat switch to the inside of the seat side shield (Fig.direction. If a motor fails to operate in only one direc- 2).tion, move the seat a short distance in the opposite (7) Remove the power seat switch from the seatdirection and test again to be certain the adjuster is side shield.not at its travel limit. If one or more of the motors (8) Reverse the removal procedures to install.operate, see the diagnosis for the Power Seat Switch Tighten the mounting screws to 2.2 N·m (20 in. lbs.).in this group. If no motors operate, proceed as fol-lows:
  3. 3. OFF SWITCHSIDE SHIELD SEAT POSITION SCREWS CONTINUITY BETWEENSWITCH POWER SEAT BODY CONNECTOR NESS WIRE HAR- VIEWED FROM DOWN OFP TERMINALS SHOWN REAR AS DRIVER SIDEBELT SWITCH SWITCH U AFT/FORWARD SEAT SEAT FRONT CONNECTOR VERTICAL UPXJ POWER SEAT SYSTEMS 8R - 3 VERTICAL DOWNREMOVAL AND INSTALLATION (Continued) HORIZONTAL FORWARD HORIZONTAL AFT FRONT TILT UP FRONT TILT DOWN REAR TILT UP REAR TILT DOWN Fig. 1 Power Seat Switch Continuity Fig. 2 Power Seat Switch Remove/Install Fig. 3 Driver Seat Belt Switch ConnectorPOWER SEAT ADJUSTER AND MOTORS (6) Remove the nut that secures the inboard rear (1) Move the seat to its fully raised and fully for- of the seat adjuster frame to the stud on the floorward position, if possible. pan. (2) Disconnect and isolate the battery negative (7) Unplug the power seat wire harness connectorcable. from the body wire harness connector. (3) Unplug the seat belt switch wire harness con- (8) Remove the driver side power seat and adjusternector from the driver side seat belt buckle half on assembly from the vehicle.the inboard side of the seat (Fig. 3). (9) Unplug the power seat wire harness connectors (4) Remove the two screws that secure the front of at each of the three power seat motors.the seat adjuster frame to the floor pan seat mount- (10) Remove the four nuts that secure the seating reinforcement (Fig. 4). adjuster and motors assembly to the seat cushion (5) Remove the screw that secures the outboard frame and remove the adjuster and motors assemblyrear of the seat adjuster frame to the floor pan. from the seat (Fig. 5). (11) Reverse the removal procedures to install. Tighten the seat mounting hardware as follows:
  4. 4. SCREW POWER NUT AND MOTORSCUSHION SEAT ADJUSTER FRAME SEAT DRIVER CUSHION SEATFRONT SEAT STUD SCREW FRAME SIDE8R - 4 POWER SEAT SYSTEMS XJREMOVAL AND INSTALLATION (Continued) • Seat adjuster to floor panel screws - 27 N·m (20 ft. lbs.) • Seat adjuster to floor panel nut - 40 N·m (30 ft. lbs.). Fig. 4 Power Seat Remove/Install Fig. 5 Power Seat Adjuster and Motors Remove/ Install • Seat adjuster to seat cushion frame nuts - 25N·m (18 ft. lbs.)

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