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00AN_8R

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AN POWER SEAT SYSTEMS 8R - 1

POWER SEAT SYSTEMS
TABLE OF CONTENTS

page page

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

GENERAL INFORMATION manual for more information on the power seat
switch functions and the seat adjusting procedures.
INTRODUCTION The individual switches in the power seat switch
A six-way driver side power seat is an available unit cannot be repaired. If one switch is damaged or
factory-installed option for this model, when it is also faulty, the entire power seat switch unit must be
equipped with the bucket or split bench seat option. replaced.
Refer to 8W-63 - Power Seat in Group 8W - Wiring
Diagrams for complete circuit descriptions and dia- POWER SEAT ADJUSTER AND MOTORS
grams. There are three reversible motors that operate the
power seat adjuster. The motors are connected to
POWER SEAT SYSTEM worm-drive gearboxes that move the seat adjuster
The power seat system option allows the driver to through a combination of screw-type drive units.
electrically adjust his seating position for optimum The front and rear of a seat are operated by differ-
control and comfort using the power seat switches ent motors. They can be raised or lowered indepen-
located on the outboard seat cushion side shield. The dently of each other. When the center seat switch is
power seat system allows the seating position to be pushed to the Up or Down position, both the front
adjusted forward, rearward, front up, front down, and rear motors operate in unison, moving the entire
rear up, or rear down. The power seat system seat up or down. The forward-rearward motor is
receives battery current through a fuse in the Power operated by pushing the center seat switch to the
Distribution Center and a circuit breaker in the junc- Forward or Rearward position.
tion block, regardless of the ignition switch position. When a switch is actuated, a battery feed and a
The power seat system includes the power seat ground path are applied through the switch contacts
adjuster and motors unit, the power seat switch, and to the motor(s). The motor(s) and drives operate to
the circuit breaker. Following are general descrip- move the seat in the selected direction until the
tions of the major components in the power seat sys- switch is released, or until the travel limit of the
tem. Refer to the owner's manual in the vehicle glove power seat adjuster is reached. When the switch is
box for more information on the features, use and moved in the opposite direction, the battery feed and
operation of the power seat system. ground path to the motor(s) are reversed through the
switch contacts. This causes the motor to run in the
opposite direction.
DESCRIPTION AND OPERATION Each motor contains a self-resetting circuit breaker
to protect it from overload. Consecutive or frequent
POWER SEAT SWITCH resetting of the circuit breakers must not be allowed
The power seat can be adjusted in six different to continue, or the motors may be damaged. Make
ways using the power seat switch. The switch is the necessary repairs.
located on the lower outboard side of the seat cushion The power seat adjuster and motors cannot be
on the seat cushion side shield. Refer to the owner's repaired, and are serviced only as a complete unit. If
8R - 2 POWER SEAT SYSTEMS AN
DESCRIPTION AND OPERATION (Continued)
any component in this unit is faulty or damaged, the at its travel limit. If the power seat adjuster still
entire power seat adjuster and motors assembly must fails to operate in only one direction, see Power Seat
be replaced. Switch in the Diagnosis and Testing section of this
group. If the power seat adjuster fails to operate in
CIRCUIT BREAKER more than one direction, proceed as follows:
An automatic resetting circuit breaker in the junc- (1) Test the circuit breaker in the junction block as
tion block is used to protect the power seat system described in this group. If OK, go to Step 2. If not
circuit. The circuit breaker can protect the system OK, replace the faulty circuit breaker.
from a short circuit, or from an overload condition (2) Remove the power seat switch from the seat.
caused by an obstructed or stuck seat adjuster. Check for battery voltage at the fused B(+) circuit
The circuit breaker cannot be repaired and, if cavity of the power seat switch wire harness connec-
faulty or damaged, it must be replaced. tor. If OK, go to Step 3. If not OK, repair the open
circuit to the junction block as required.
(3) Check for continuity between the ground cir-
DIAGNOSIS AND TESTING cuit cavity of the power seat switch wire harness con-
nector and a good ground. There should be
POWER SEAT SYSTEM continuity. If OK, go to Step 4. If not OK, repair the
Before any testing of the power seat system is open circuit to ground as required.
attempted, the battery should be fully-charged and (4) Test the power seat switch as described in this
all wire harness connections and pins cleaned and group. If the switch tests OK, check the wire harness
tightened to ensure proper continuity and grounds. for the inoperative power seat motor(s) between the
For circuit descriptions and diagrams, refer to 8W-63 power seat switch and the motor for shorts or opens.
- Power Seat in Group 8W - Wiring Diagrams. If the circuits check OK, replace the faulty power
With the dome lamp on, apply the power seat seat adjuster and motors assembly. If the circuits are
switch in the direction of the failure. If the dome not OK, repair the wire harness as required.
lamp dims, the seat may be jamming. Check under
and behind the seat for binding or obstructions. If POWER SEAT SWITCH
the dome lamp does not dim, proceed with testing of For circuit descriptions and diagrams, refer to
the individual components and circuits. 8W-63 - Power Seat in Group 8W - Wiring Diagrams.
(1) Disconnect and isolate the battery negative
CIRCUIT BREAKER cable.
For circuit descriptions and diagrams, refer to (2) Remove the power seat switch from the power
8W-63 - Power Seat in Group 8W - Wiring Diagrams. seat.
(1) Locate the correct circuit breaker in the junc- (3) Use an ohmmeter to test the continuity of the
tion block. Pull out the circuit breaker slightly, but power seat switches in each position. See the Power
be certain that the circuit breaker terminals still con- Seat Switch Continuity chart (Fig. 1). If OK, see
tact the terminals in the junction block cavities. Power Seat Adjuster and Motors in the Diagnosis
(2) Connect the negative lead of a 12-volt DC volt- and Testing section of this group. If not OK, replace
meter to a good ground. the faulty power seat switch unit.
(3) With the voltmeter positive lead, check both
terminals of the circuit breaker for battery voltage.
If only one terminal has battery voltage, the circuit REMOVAL AND INSTALLATION
breaker is faulty and must be replaced. If neither ter-
minal has battery voltage, repair the open circuit POWER SEAT SWITCH
from the Power Distribution Center (PDC) as (1) Disconnect and isolate the battery negative
required. cable.
(2) Remove the screw that secures the recliner
POWER SEAT ADJUSTER AND MOTORS lever to the recliner mechanism release shaft on the
For circuit descriptions and diagrams, refer to outboard side of the driver side front seat.
8W-63 - Power Seat in Group 8W - Wiring Diagrams. (3) Pull the recliner lever off of the recliner mech-
Operate the power seat switch to move all three anism release shaft.
seat motors in each direction. The seat should move (4) Remove the three screws that secure the driver
in each of the selected directions. If the power seat side seat cushion side shield to the outboard seat
adjuster fails to operate in only one direction, move cushion frame.
the adjuster a short distance in the opposite direction (5) Pull the driver side seat cushion side shield
and test again to be certain that the adjuster is not away from the seat cushion frame far enough to
AN POWER SEAT SYSTEMS 8R - 3
REMOVAL AND INSTALLATION (Continued)

POWER SEAT SWITCH
Fig. 2 Power Seat Switch Remove/Install - Typical
SWITCH CONTINUITY
1

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