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98DN_8R


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DN                                                                                         POWER SEAT SYSTEMS              8R - 1



                                        POWER SEAT SYSTEMS
                                                          CONTENTS

                                                            page                                                             page

GENERAL INFORMATION                                                   DIAGNOSIS AND TESTING
 INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . .   1    POWER SEAT ADJUSTER AND MOTORS . . . . .                    2
 POWER SEAT SYSTEM . . . . . . . . . . . . . . . . . . .          1    POWER SEAT SWITCH . . . . . . . . . . . . . . . . . . . .   2
DESCRIPTION AND OPERATION                                              POWER SEAT SYSTEM . . . . . . . . . . . . . . . . . . .     2
 POWER SEAT ADJUSTER AND MOTORS . . . . .                         1   REMOVAL AND INSTALLATION
 POWER SEAT SWITCH . . . . . . . . . . . . . . . . . . . .        1    POWER SEAT ADJUSTER AND MOTORS . . . . .                    3
                                                                       POWER SEAT SWITCH . . . . . . . . . . . . . . . . . . . .   3

GENERAL INFORMATION                                                   POWER SEAT ADJUSTER AND MOTORS
                                                                        There are three reversible motors that operate the
INTRODUCTION                                                          power seat adjuster. The motors are connected to
  A six-way driver side power seat is an available                    worm-drive gearboxes that move the seat adjuster
factory-installed option for this model. Refer to                     through a combination of screw-type drive units.
8W-63 - Power Seat in Group 8W - Wiring Diagrams                        The front and rear of a seat are operated by differ-
for complete circuit descriptions and diagrams.                       ent motors. They can be raised or lowered indepen-
                                                                      dently of each other. When the center seat switch is
POWER SEAT SYSTEM                                                     pushed to the Up or Down position, both the front
   The power seat system option allows the driver to                  and rear motors operate in unison, moving the entire
electrically adjust his seating position for optimum                  seat up or down. The forward-rearward motor is
control and comfort using the power seat switches                     operated by pushing the center seat switch to the
located on the outboard seat cushion side shield. The                 Forward or Rearward position.
power seat system allows the seating position to be                     When a switch is actuated, a battery feed and a
adjusted forward, rearward, front up, front down,                     ground path are applied through the switch contacts
rear up, or rear down. The power seat system                          to the motor(s). The motor(s) and drives operate to
receives battery current through a fuse in the Power                  move the seat in the selected direction until the
Distribution Center, regardless of the ignition switch                switch is released, or until the travel limit of the
position.                                                             power seat adjuster is reached. When the switch is
   The power seat system includes the power seat                      moved in the opposite direction, the battery feed and
adjuster and motors unit, the power seat switch, and                  ground path to the motor(s) are reversed through the
the circuit breaker. Following are general descrip-                   switch contacts. This causes the motor to run in the
tions of the major components in the power seat sys-                  opposite direction.
tem. Refer to the owner's manual in the vehicle glove                   Each motor contains a self-resetting circuit breaker
box for more information on the features, use and                     to protect it from overload. Consecutive or frequent
operation of the power seat system.                                   resetting of the circuit breakers must not be allowed
                                                                      to continue, or the motors may be damaged. Make
                                                                      the necessary repairs.
DESCRIPTION AND OPERATION                                               The power seat adjuster and motors cannot be
                                                                      repaired, and are serviced only as a complete unit. If
POWER SEAT SWITCH                                                     any component in this unit is faulty or damaged, the
  The power seat can be adjusted in six different                     entire power seat adjuster and motors assembly must
ways using the power seat switch. The switch is                       be replaced.
located on the lower outboard side of the seat cushion
on the seat cushion side shield. Refer to the owner's
manual for more information on the power seat
switch functions and the seat adjusting procedures.
  The individual switches in the power seat switch unit
cannot be repaired. If one switch is damaged or faulty,
the entire power seat switch unit must be replaced.
8R - 2    POWER SEAT SYSTEMS                                                                               DN


DIAGNOSIS AND TESTING                                       (1) Disconnect and isolate the battery negative
                                                          cable.
POWER SEAT SYSTEM                                           (2) Remove the power seat switch from the power
   Before any testing of the power seat system is         seat.
attempted, the battery should be fully-charged and          (3) Use an ohmmeter to test the continuity of the
all wire harness connections and pins cleaned and         power seat switches in each position. See the Power
tightened to ensure proper continuity and grounds.        Seat Switch Continuity chart (Fig. 1). If OK, see
For circuit descriptions and diagrams, refer to 8W-63     Power Seat Adjuster and Motors in the Diagnosis
- Power Seat in Group 8W - Wiring Diagrams.               and Testing section of this group. If not OK, replace
   With the dome lamp on, apply the power seat            the faulty power seat switch unit.
switch in the direction of the failure. If the dome
lamp dims, the seat may be jamming. Check under
and behind the seat for binding or obstructions. If
the dome lamp does not dim, proceed with testing of
the individual components and circuits.

POWER SEAT ADJUSTER AND MOTORS
   For circuit descriptions and diagrams, refer to
8W-63 - Power Seat in Group 8W - Wiring Diagrams.
   Operate the power seat switch to move all three
seat motors in each direction. The seat should move
in each of the selected directions. If the power seat
adjuster fails to operate in only one direction, move
the adjuster a short distance in the opposite direction
and test again to be certain that the adjuster is not
at its travel limit. If the power seat adjuster still
fails to operate in only one direction, see Power Seat
Switch in the Diagnosis and Testing section of this
group. If the power seat adjuster fails to operate in
more than one direction, proceed as follows:
   (1) Check for battery voltage at the fuse in the
Power Distribution Center (PDC). If OK, go to Step
2. If not OK, repair the shorted circuit or component
as required and replace the faulty fuse.
   (2) Remove the power seat switch from the seat.
Check for battery voltage at the fused B(+) circuit
cavity of the power seat switch wire harness connec-
tor. If OK, go to Step 3. If not OK, repair the open
circuit to the PDC as required.
   (3) Check for continuity between the ground cir-
cuit cavity of the power seat switch wire harness con-
nector and a good ground. There should be
continuity. If OK, go to Step 4. If not OK, repair the
open circuit to ground as required.
   (4) Test the power seat switch as described in this
group. If the switch tests OK, check the wire harness
for the inoperative power seat motor(s) between the
power seat switch and the motor for shorts or opens.
If the circuits check OK, replace the faulty power
seat adjuster and motors assembly. If the circuits are
not OK, repair the wire harness as required.                      Fig. 1 Power Seat Switch Continuity

POWER SEAT SWITCH
 For circuit descriptions and diagrams, refer to
8W-63 - Power Seat in Group 8W - Wiring Diagrams.
DN                                                                          POWER SEAT SYSTEMS           8R - 3


REMOVAL AND INSTALLATION
POWER SEAT SWITCH
  (1) Disconnect and isolate the battery negative
cable.
  (2) Remove the screw that secures the recliner
lever to the recliner mechanism release shaft on the
outboard side of the driver side front seat.
  (3) Pull the recliner lever off of the recliner mech-
anism release shaft.
  (4) Remove the three screws that secure the driver
side seat cushion side shield to the outboard seat
cushion frame.
  (5) Pull the driver side seat cushion side shield
away from the seat cushion frame far enough to
access the power seat switch module wire harness
connector.                                                 Fig. 2 Power Seat Switch Remove/Install - Typical
  (6) Unplug the wire harness connector from the            (3) Unplug the power seat wire harness connectors
power seat switch module.                                 at each of the three power seat motors.
  (7) Remove the seat cushion side shield and power         (4) Release the power seat wire harness retainers
seat switch module from the seat as a unit.               from the seat adjuster and motors assembly.
  (8) Remove the two screws that secure the power           (5) Remove the four screws that secure the power
seat switch to the inside of the seat cushion side        seat adjuster and motors assembly to the seat cush-
shield (Fig. 2).                                          ion frame.
  (9) Remove the power seat switch from the seat            (6) If the vehicle is equipped with a split bench
cushion side shield.                                      seat, remove the fasteners that secure the center seat
  (10) Reverse the removal procedures to install.         cushion section to the brackets on the power seat
Tighten the switch mounting screws to 2.2 N



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