Power Lumbar Description w/o A45

The driver and passenger power lumbar systems each consist of a lumbar switch and 2 reversible 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 switch, located on the outboard side of each seat, directly controls both lumbar motors located in the seatback.

Power Lumbar Description with A45

The memory lumbar system consists of the memory seat module (MSM) and 2 lumbar motors. Each lumbar motor, horizontal and vertical has a position sensor attached to it. Both lumbar motors are controlled by the MSM and 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.

Both motors are reversible. For example, the lumbar horizontal position is moved forward and back by one motor. When the MSM receives an input to move the lumbar back, the MSM supplies battery positive voltage (B+) and ground to run the lumbar horizontal motor in order to move the lumbar back, away from the driver's back. When the MSM receives a lumbar forward input, the MSM will supply power to the same motor, but the voltage and ground will be on the opposite motor cavities. The voltage polarity is reversed and the motor will run the opposite direction, moving the lumbar forward, toward the driver's back. The lumbar vertical motor is also powered this way.

The MSM provides each lumbar motor with a soft stop. The module will actually stop the motor just before the physical end-of-travel for that motor. This decreases the stress on each motor. If a motor reaches the end-of-travel due a soft stop and the seat switch is released and then activated again, the lumbar support will move a short distance farther, to the physical travel limit.

The memory seat module (MSM) receives the lumbar support manual movement inputs from the lumbar switch. When a lumbar forward, back, up, or down input is received, the MSM supplies battery positive voltage (B+) and ground to the appropriate motor and the lumbar support moves accordingly.

Refer to Memory Seat Description .

Refer to Memory Seat Description .