The seat lumbar support system consists of the following components:

The lumbar switch provides both power and ground to the selected lumbar motors. Battery positive voltage is supplied at all times to the lumbar switch from the SEAT Circuit Breaker located in the IP fuse block. Ground is supplied at all times to the lumbar switch through the switch ground circuit and G 301.

The lumbar support system consists of two lumbar motors, horizontal and vertical, that operate independently of each other. The lumbar horizontal motor moves the lumbar support forward or rearward and the lumbar vertical motor moves the lumbar support up or down. Each motor contains an electronic circuit breaker (PTC) that will reset only after voltage has been removed from the motor.

Both of the lumbar motors are reversible. For example, when the lumbar switch is operated to move the lumbar forward, battery positive voltage is applied through the switch contacts and the lumbar motor forward control circuit. and ground is applied through the rearward switch contacts and the lumbar motor rearward control circuit. The motor then runs to move 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 positive voltage and ground are applied on opposite circuits causing the motor to run in the opposite direction. The lumbar support vertical motor is also powered this way.