Power Lumbar Adjuster and Motor

Operate the power seat switch to inflate and deflate the power lumbar support. The lumbar support should inflate and deflate as selected. If the power lumbar support fails to operate in only one direction, move the support a short distance in the opposite direction and test again to be certain that the support is not already fully inflated or deflated. If the power lumbar support still fails to operate in only one direction, see Power Seat Switch in the Diagnosis and Testing. If the power lumbar support fails to operate in more than one direction, proceed as follows:
1. Test the circuit breaker in the junction block as described. If OK, go to Step 2. If not OK, replace the faulty circuit breaker.
2. Remove the power seat switch from the seat. Check for battery voltage at the fused B(+) circuit cavity of the power seat switch wire harness 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 circuit cavity of the power seat switch wire harness 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. If the switch tests OK, check the wire harness between the power seat switch and the power lumbar support motor for shorts or opens. If the circuits check OK, replace the faulty power lumbar support adjuster and motor assembly If the circuits are not OK, repair the wire harness as required.