RAM 1500 Truck 4WD V8-5.9L VIN Z (2002)
Power Seat Motor: Testing and Inspection
LUMBAR MOTOR
Actuate the power lumbar switch to move the power lumbar adjuster in each direction. The power lumbar adjuster should move in both directions. It
should be noted that the power lumber adjuster normally operates very quietly and exhibits little visible movement. If the power lumbar 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 lumbar adjuster fails to operate in only one direction, Test the appropriate power seat switch as described in this group. If the
power lumbar adjuster fails to operate in either direction, perform the following tests. For complete circuit diagrams, refer to Wiring.
1. Check the power seat circuit breaker. If OK, go to Step 2. If not OK, replace the faulty power seat circuit breaker.
2. Check for battery voltage at the power seat circuit breaker. If OK, go to Step 3. If not OK, repair the open fused B(+) circuit to the fuse in the
Integrated Power Module as required.
3. Remove the outboard seat cushion side shield from the seat. Disconnect the seat wire harness connector from the power lumbar switch connector
receptacle. Check for battery voltage at the fused B(+) circuit cavity of the power seat wire harness connector for the power lumbar switch. If OK,
go to Step 4. If not OK, repair the open fused B(+) circuit to the power seat as required.
4. Check for continuity between the ground circuit cavity of the power seat wire harness connector for the power lumbar switch and a good ground.
There should be continuity. If OK, go to Step 5. If not OK, repair the open ground circuit to ground as required.
5. Test the power lumbar switch. . If the switch tests OK, test the circuits of the power seat wire harness between the power lumbar adjuster motor
and the power lumbar switch for shorts or opens. If the circuits check OK, replace the faulty seat back frame assembly If the circuits are not OK,
repair the power seat wire harness as required.
