Test U: The Power Lumbar Is Inoperative - Driver

PINPOINT TEST U: THE POWER LUMBAR IS INOPERATIVE - DRIVER

Normal Operation
The lumbar control switch is powered by voltage to circuit 566 (DG) and ground to circuit 57 (BK). The lumbar control switch toggles voltage and ground directly to the lumbar motor circuits 1094 (PK) and 1097 (BN). The lumbar motor tightens or relaxes a cable connected to the lumbar adjuster.

This pinpoint test is intended to diagnose the following:
- Fuse or circuit breaker
- Wiring, terminals or connectors
- Lumbar control switch
- Lumbar assembly

U1:

U1-U3:

U3-U4:

U5: