Seat Cushion Side Bolster Description and Operation

Seat Cushion Side Bolster Description and Operation

Lumbar Support Components

The driver and front passenger seat cushion side bolsters support system consists of the following components:

* Seat back bolster adjuster switch

* Seat cushion bolster adjuster switch

* Seat bolster control valve

* Seat lumbar/bolster pump

* FRT/PWR/SEAT Circuit Breaker 25 A

Battery voltage is supplied at all times to the driver and passenger seat lumbar adjuster switches through 25 A circuit breakers located in the rear fuse block. When a lumbar switch is pressed to inflate the seat cushion or seat back side bolsters, battery voltage is applied through the switch contacts and the inflate signal circuit to the seat bolster control valve. In response to this signal, the bolster control valve energizes its internal inflate solenoid and applies battery voltage through the seat lumbar/bolster pump control circuit to the pump. The pump runs to inflate the appropriate bolster bladders until the switch is released. When the switch is pressed to deflate the side bolsters, battery voltage is applied through the switch contacts and the deflate signal circuit to the bolster control valve. The valve energizes its internal deflate solenoid and air is released from the bladder until the switch is released. Ground for the bolster valve and the seat lumbar/bolster pump is supplied at G200 for the driver seat and G201 for the passenger seat.