Test F: The Power Lumbar Is Inoperative - Driver

PINPOINT TEST F: THE POWER LUMBAR IS INOPERATIVE - DRIVER

Normal Operation
The lumbar control switch is powered by battery voltage to circuit 517 (BK/WH). When the lumbar control switch is toggled in one direction, battery power is applied directly to a compressor in the seat backrest lumbar assembly from circuit 1094 (PK). The lumbar compressor is directly connected to ground from circuit 57 (BK). When switch power is applied to the compressor motor, air is pumped into the lumbar bladder expanding the backrest foam pad. Toggling the switch to the opposite position applies power to a solenoid valve coil in the compressor from circuit 1097 (BN) to release air from the lumbar bladder and the backrest foam pad relaxes.

This pinpoint test is intended to diagnose the following:
- Faulty circuit breaker
- Faulty circuit
- Faulty lumbar control switch
- Faulty lumbar assembly

F1-F3:

F3-F5:

F5-F6:

F7-F8: