Lumbar Support System Operation

WARNING: This page is about a different car, the 2003 Chevrolet Corvette. However, it is still accessible from the selected car via links, so may be relevant.

Lumbar pump operation is controlled through relays in the lumbar module. Battery positive voltage from the instrument panel electrical center is supplied to the lumbar module and is used for pump operation. Battery positive voltage from the instrument panel electrical center is supplied to the lumbar control switches and is used to energize the relay coils. When a lumbar switch is pressed voltage is supplied to the control circuit which supplies the inflate or deflate relay coil and the pressure switch relay coil. Either the inflate or deflate relay along with the pressure switch relay must be energized in order for pump operation to occur. The lumbar control circuits are also used to control valves in the air lines from the lumbar pump to the seat lumbar and side bladders.