Lumbar Support

Lumbar Support Description and Operation

Power Lumbar System Components:

* Lumbar support switch
* Lumbar support motor
* 30 A fuse

Lumbar Support Operation

The power lumbar support is completely controlled through the lumbar switch. Battery voltage is supplied at all times to the lumbar switch through a 30 A fuse located in the rear fuse block. When the lumbar switches are in an inactive state, the switch contacts are closed to the switch ground circuit.

The lumbar support motor moves the lumbar support horizontally forward and rearward. It contains an electronic circuit breaker (PTC) that will reset only after voltage has been removed from the motor.

The lumbar motor is reversible. For example, when the lumbar forward switch is pressed to move the lumbar support forward, battery voltage is applied through the switch contacts and the lumbar motor forward control circuit to the motor. The motor is grounded through the lumbar motor rearward switch contacts and the lumbar motor rearward control circuit to the motor. The motor runs in order to drive the lumbar support forward toward the occupants 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.