Circuit/System Description

The seat adjuster switch on vehicles equipped with the seat memory lumbar/bolster feature is a LIN Bus device. When a seat function select switch, lumbar/bolster 4-way switch, or the massage switch is pressed, a serial data message is sent from the seat adjuster switch to the seat memory control module indicating the seat lumbar/bolster request. The seat memory control module then commands the seat bolster memory module, via LIN serial data messages, to perform the required pneumatic movements.

The seat bolster memory control module contains the electronic circuitry for executing the commanded pneumatic seat adjustments, air direction solenoids, pressure sensors for storing air bladder pressures. When a seat lumbar or massage function is commanded ON, the module applies battery voltage to the external seat air pump motor when any of the air bladders require inflating.