Power Seat Motor: Testing and Inspection

Power Seat Lumbar Adjuster and Motor Test

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 still fails to operate in only one direction, refer to Power Lumbar Switch in the Diagnosis and Testing. If the power lumbar adjuster fails to operate in either direction, perform the following tests.
1. Check the power seat fuse in the power distribution center. If OK, go to Step 2. If not OK, replace the faulty power seat fuse.
2. Check for battery voltage at the power seat fuse in the power distribution center. If OK, go to Step 3. If not OK, repair the open fused B(+) circuit to the fuse in the Power Distribution Center 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 fuse in the power distribution center 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. Refer to Power Lumbar Switch in the Diagnosis and Testing. 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.