Service Manuals, User Guides, Schematic Diagrams or docs for : . Car Manuals Jeep Cherokee XJ 1997.1999-2001 Approved 1999 XJ Jeep Cherokee EXJ_8R

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EXJ_8R

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XJ POWER SEAT SYSTEMS 8R - 1

POWER SEAT SYSTEMS
CONTENTS

page page

GENERAL INFORMATION POWER SEAT ADJUSTER AND MOTORS . . . . . 2
INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . 1 POWER SEAT SWITCH . . . . . . . . . . . . . . . . . . . . 2
POWER SEAT SYSTEM . . . . . . . . . . . . . . . . . . . 1 POWER SEAT SYSTEM . . . . . . . . . . . . . . . . . . . 2
DESCRIPTION AND OPERATION REMOVAL AND INSTALLATION
CIRCUIT BREAKER . . . . . . . . . . . . . . . . . . . . . . . 2 POWER SEAT ADJUSTER AND MOTORS . . . . . 4
POWER SEAT ADJUSTER AND MOTORS . . . . . 1 POWER SEAT SWITCH . . . . . . . . . . . . . . . . . . . . 3
POWER SEAT SWITCH . . . . . . . . . . . . . . . . . . . . 1
DIAGNOSIS AND TESTING
CIRCUIT BREAKER . . . . . . . . . . . . . . . . . . . . . . . 2

GENERAL INFORMATION tions of the major components in the power seat sys-
tem. Refer to the owner's manual in the vehicle glove
INTRODUCTION box for more information on the features, use and
Six-way power seats are an available factory-in- operation of the power seat system.
stalled option for Left-Hand Drive (LHD) versions of
this model. Refer to 8W-63 - Power Seat in Group DESCRIPTION AND OPERATION
8W - Wiring Diagrams for complete circuit descrip-
tions and diagrams.
POWER SEAT SWITCH
NOTE: This group covers both Left-Hand Drive The power seat can be adjusted in six different
(LHD) and Right-Hand Drive (RHD) versions of this ways using the power seat switch. The switch is
model. Whenever required and feasible, the RHD located on the lower outboard side of the seat cushion
versions of affected vehicle components have been on the seat cushion side shield. Refer to the owner's
constructed as mirror-image of the LHD versions. manual for more information on the power seat
While most of the illustrations used in this group switch functions and the seat adjusting procedures.
represent only the LHD version, the diagnostic and The individual switches in the power seat switch
service procedures outlined can generally be unit cannot be repaired. If one switch is damaged or
applied to either version. Exceptions to this rule faulty, the entire power seat switch unit must be
have been clearly identified as LHD or RHD, if a replaced.
special illustration or procedure is required.
POWER SEAT ADJUSTER AND MOTORS
There are three reversible motors that operate the
POWER SEAT SYSTEM power seat adjuster. The motors are connected to
The power seat system option allows the front worm-drive gearboxes that move the seat adjuster
seating positions to be electrically adjusted for opti- through a combination of screw-type drive units.
mum control and comfort using the power seat The front and rear of a seat are operated by differ-
switches located on the outboard seat cushion side ent motors. They can be raised or lowered indepen-
shield. The power seat system allows the seating dently of each other. When the center seat switch is
position to be adjusted forward, rearward, front up, pushed to the Up or Down position, both the front
front down, rear up, or rear down. The power seat and rear motors operate in unison, moving the entire
system receives battery current through a fuse in the seat up or down. The forward-rearward motor is
Power Distribution Center and a circuit breaker in operated by pushing the center seat switch to the
the junction block, regardless of the ignition switch Forward or Rearward position.
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
8R - 2 POWER SEAT SYSTEMS XJ
DESCRIPTION AND OPERATION (Continued)
switch is released, or until the travel limit of the minal has battery voltage, repair the open circuit
power seat adjuster is reached. When the switch is from the Power Distribution Center (PDC) as
moved in the opposite direction, the battery feed and required.
ground path to the motor(s) are reversed through the
switch contacts. This causes the motor to run in the POWER SEAT ADJUSTER AND MOTORS
opposite direction. For circuit descriptions and diagrams, refer to
Each motor contains a self-resetting circuit breaker 8W-63 - Power Seat in Group 8W - Wiring Diagrams.
to protect it from overload. Consecutive or frequent Operate the power seat switch to move all three
resetting of the circuit breakers must not be allowed seat motors in each direction. The seat should move
to continue, or the motors may be damaged. Make in each of the selected directions. If the power seat
the necessary repairs. adjuster fails to operate in only one direction, move
The power seat adjuster and motors cannot be the adjuster a short distance in the opposite direction
repaired, and are serviced only as a complete unit. If and test again to be certain that the adjuster is not
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 power seat switch and the motor for shorts or opens.
8W-63 - 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 the
tact the terminals in the junction block cavities. diagnosis for the Power Seat Adjuster and Motors in
(2) Connect the negative lead of a 12-volt DC volt- this group. If not OK, replace the faulty power seat
meter to a good ground. switch module.
(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
breaker is faulty and must be replaced. If neither ter-
XJ POWER SEAT SYSTEMS 8R - 3
DIAGNOSIS AND TESTING (Continued)

REMOVAL AND INSTALLATION
POWER SEAT SWITCH
(1) Disconnect and isolate the battery negative
cable.
(2) Remove the three screws that secure the seat
cushion side shield to the outboard seat cushion
frame.
(3) Pull the seat cushion side shield away from the
seat cushion frame far enough to access the power
seat switch wire harness connector.
(4) Unplug the wire harness connector from the
power seat switch.
(5) Remove the seat cushion side shield from the
seat.
(6) Remove the two screws that secure the power
seat switch to the inside of the seat cushion side
shield (Fig. 2).

Fig. 2 Power Seat Switch Remove/Install

Fig. 1 Power Seat Switch Continuity
8R - 4 POWER SEAT SYSTEMS XJ
REMOVAL AND INSTALLATION (Continued)
(7) Remove the power seat switch from the seat
cushion side shield.
(8) Reverse the removal procedures to install.
Tighten the mounting screws to 2.2 N

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