Lumbar Support (Without RPO Code A45)

LUMBAR SUPPORT DESCRIPTION AND OPERATION (W/O A45)

LUMBAR SUPPORT COMPONENTS
The driver and passenger seat lumbar support systems each consist of the following components:
- Lumbar Switch
- Lumbar Horizontal Motor
- SEATS Circuit Breaker 30 A

POWER LUMBAR SWITCH
The power lumbar switches provide both power and ground to the lumbar motor. Battery positive voltage is supplied at all times to the driver and passenger seat lumbar switch from the SEATS Circuit Breaker located in the left rear fuse block. Both lumbar switches are grounded through the switch ground circuit and G307.

LUMBAR MOTOR
The lumbar support system consists of one motor that moves the lumbar support horizontally forward or rearward. The motor contains an electronic circuit breaker (PTC) that opens in the event of a circuit overload and will reset only after voltage has been removed from the circuit.

LUMBAR OPERATION
When the lumbar switch is operated to move the lumbar support forward, battery positive voltage is applied through the switch contacts and the lumbar motor forward control circuit to the motor. The motor is grounded through the lumbar rearward switch contacts and the lumbar motor rearward control circuit to the 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 positive voltage and ground are applied on opposite circuits causing the motor to run in the opposite direction.