Power Lumbar Adjuster/Motor; Power Lumbar Switch; Power Recliner Adjuster/Motor; Power Seat Adjuster/Motors - Jeep 1996 Grand Cherokee Service Manual

8R - 4 POWER SEAT SYSTEMS
DIAGNOSIS AND TESTING (Continued)

POWER LUMBAR SWITCH

For circuit descriptions and diagrams, refer to
8W-63 - Power Seat in Group 8W - Wiring Diagrams.
To check the power lumbar switch:
(1) Remove the power lumbar switch as described
in this group.
(2) Use an ohmmeter to test the continuity of the
switch in each position. See the Power Lumbar
Switch Continuity chart (Fig. 2). If OK, see the
affected Power Lumbar Adjuster/Motor diagnosis. If
not OK, replace the faulty switch.
Fig. 2 Power Lumbar Switch Continuity

POWER SEAT ADJUSTER/MOTORS

The tests below apply to a power seat system with-
out the memory system option. For testing of the
power seats with the memory system, refer to the
proper Body Diagnostic Procedures Manual. For cir-
cuit 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. The seat should move in all directions.
If one or more of the motors operate, see the diagno-
sis for the Power Seat Switch in this group. If no
motors operate, proceed as follows:
(1) Check the circuit breaker in the junction block.
If OK, go to Step 2. If not OK, replace the faulty cir-
cuit breaker.
(2) Remove the power seat switch as described in
this group, and check for battery voltage at the fused
B(+) circuit cavity of the switch connector. 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-
cuit cavity of the switch connector 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 circuits for
the inoperative motor between the switch and the
motor for shorts or opens. If the circuits check OK,
replace the faulty power seat adjuster and motors
assembly.

POWER RECLINER ADJUSTER/MOTOR

The tests below apply to a power seat system with-
out the memory system option. For testing of the
power seats with the memory system, refer to the
proper Body Diagnostic Procedures Manual. For cir-
cuit descriptions and diagrams, refer to 8W-63 -
Power Seat in Group 8W - Wiring Diagrams.
Operate the power seat switch to move the power
recliner. The recliner should move in both directions.
If the power recliner fails to operate in only one
direction, see the diagnosis for the Power Seat
Switch in this group. If the power recliner fails to
operate at all, proceed as follows:
(1) Check the circuit breaker in the junction block.
If OK, go to Step 2. If not OK, replace the faulty cir-
cuit breaker.
(2) Remove the power seat switch as described in
this group, and check for battery voltage at the fused
B(+) circuit cavity of the switch connector. 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-
cuit cavity of the switch connector 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 circuits for
the power recliner between the switch and the motor
for shorts or opens. If the circuits check OK, replace
the faulty power recliner adjuster and motor assem-
bly.

POWER LUMBAR ADJUSTER/MOTOR

The tests below apply to a power seat system with-
out the memory system option. For testing of the
power seats with the memory system, refer to the
proper Body Diagnostic Procedures Manual. For cir-
cuit descriptions and diagrams, refer to 8W-63 -
Power Seat in Group 8W - Wiring Diagrams.
Operate the power lumbar switch to move the
power lumbar adjuster. The lumbar adjuster should
move in both directions. If the power lumbar adjuster
fails to operate in only one direction, see the diagno-
ZJ