Lumbar Support Description and Operation (w/o A45)

Lumbar Support Description and Operation (w/o A45)

Lumbar Support Components

The passenger seat lumbar support system consists of the following components:

* Lumbar Switch
* Lumbar Horizontal Motor
* Lumbar Vertical Motor
* PWR SEAT Circuit Breaker 30 A
* RR LUM/ANT Fuse 20 A

Lumbar Switch

Battery positive voltage is supplied at all times to the passenger seat lumbar switch from the PWR SEAT Circuit Breaker located in the rear fuse block. The lumbar switch is grounded through the switch ground circuit and G30. The lumbar switch provides both power and ground to the selected lumbar motors.

Motors

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

Horizontal

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

Vertical

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