Lumbar Support Components

WARNING: This page is about a different car, the 2015 Chevrolet Trax and 2015 Buick Encore. However, it is still accessible from the selected car via links, so may be relevant.

The power seat lumbar support systems each consist of the following components:

Seat lumbar support switch
Lumbar support motor

The seat lumbar support switch provides both power and ground to the lumbar support motor. The motor contains an electronic circuit breaker (PTC) that will reset only after voltage has been removed from the motor. The motor moves the lumbar support forward and rearward.

When the lumbar switch is operated to move the lumbar support forward, battery positive voltage is applied through the lumbar forward switch contacts and the lumbar motor forward control circuit to the lumbar support motor. The motor is grounded through the lumbar rearward switch contacts and the lumbar motor rearward control circuit to the lumbar motor. The motor runs to drive the lumbar support forward toward the occupant's back until the switch is released. Moving the lumbar support rearward works similarly to moving the lumbar support forward, except that battery voltage and ground are applied on opposite circuits causing the motor to run in the opposite direction.