For 1990-2009 cars

## Power Lumbar Circuit Description Buick

The lumbar support system is a strap system that tightens and loosens in order to give support to the driver's or to the passenger's back. Battery positive voltage (B+) is applied at all times through the right rear fuse block PWR STS circuit breaker via CKT 1340 (ORN) to the lumbar switch. When the lumbar switch is operated, battery positive voltage (B+) is applied to the lumbar motor in order to move the lumbar strap into or away from the driver's or the passenger's back by loosening and tightening the strap.

## Power Lumbar Circuit Description Oldsmobile

The lumbar support system is a power inflate/power deflate pneumatic system used for controlling comfort seat features by inflating or deflating the air cells within the seat. The following are the major components of the pneumatic system:

• | The seat/lock switches

• | The lumbar seat module

Battery positive voltage (B+) is applied at all times through the right rear fuse block PWR STS circuit breaker via CKT 1340 (ORN) to the lumbar seat module. Battery positive voltage (B+) is applied at all times to the seat/lock switches through the right rear fuse block IP 1 fuse via CKT 40 (ORN). Placing a switch in the INFLATE position actuates the seat air pump which fills the lumbar bladder. Placing the switch in the DEFLATE position allows the bladder to deflate. There are 2 separate areas, UPPER and LOWER, within each seat that inflate or deflate. When a lumbar switch is operated, a solenoid valve opens, allowing air into or out of the respective lumbar bladder.