Lumbar Circuit Description without Memory A45

WARNING: This page is about a different car, the 2017 Cadillac ATS. However, it is still accessible from the selected car via links, so may be relevant.

NOTE:

If equipped, the passenger seat block diagram without memory is identical to the driver seat without memory.

Fig 1: Lumbar Support Block Diagram (Without Memory A45)

Courtesy of GENERAL MOTORS COMPANY

Callout	Component Name
S64D	S64D Seat Adjuster Switch - Driver
A14D	A14D Seat Lumbar Support Pump - Driver

Battery voltage is supplied at all times to the driver and passenger seat adjuster switches through 30 A fuses located in the underhood fuse block. When a lumbar switch is pressed in the forward direction to inflate the lumbar support, battery voltage is applied through the switch contacts and the inflate control circuit while ground is applied through the deflate control circuit to the seat lumbar support pump. The pump runs to inflate the lumbar bladder until the switch is released. When the switch is pressed in the rearward direction to deflate the lumbar support, battery voltage is applied through the switch contacts and the deflate control circuit while ground is applied through the inflate control circuit to the seat lumbar support pump. The pump energizes its internal deflate solenoid and air is released from the lumbar bladder until the switch is released.