GM Service Manual Online
For 1990-2009 cars only

The power lumbar circuit system consists of the following components:

    • A lumbar switch
    • A lumbar Fore/ AFT motor
    • A lumbar UP/DOWN motor
    • 2 Lumbar Adjuster Relay
    • 15 Amp Fuse
    • 30 Amp Circuit Breaker

The Lumbar Switch is power by a 15 Amp Fuse through circuit  C1440 (ORN).

Both Lumbar Adjuster Relay Fore/AFT, Up/Down are powered through a 30 Amp circuit breaker circuit   C340.

The Fore/AFT Lumbar Support Motor is power through circuit   C611 for the Fore direction. The Lumbar Support Motor is power through circuit   C610 for the AFT direction.

The UP/DOWN Lumbar Support Motor is power through circuit   C768 for the UP direction. The Lumbar Support Motor is power through circuit   C767 for the DOWN direction.