Lumbar Support Without RPO Code A45

LUMBAR SUPPORT WITHOUT RPO CODE A45

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

POWER LUMBAR SWITCH
The power lumbar switches provide both power and ground to the selected lumbar motors. Battery positive voltage is supplied at all times to the driver and passenger seat lumbar switches from the PWR SEAT Circuit Breaker located in the rear fuse block. Both lumbar switches are grounded through the switch ground circuit and G 301.

MOTOR
The lumbar 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 opens in the event of a circuit overload and will reset only after voltage has been removed from the circuit.

HORIZONTAL
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.

VERTICAL
When the lumbar switch is operated to move the lumbar support up, battery positive voltage is applied through the switch contacts and the lumbar motor up control circuit to the motor. The motor is grounded through the lumbar down switch contacts and the lumbar motor down control circuit to the 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.