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 the lumbar motors located in the seatback.

Power Lumbar Description with AC9

The left and right adaptive seat system each consist of the lumbar switch, the adaptive lumbar module, a pump motor, and an air bladder in the seat cushion and seat back. This is a power inflate/deflate pneumatic system used for controlling seat comfort by inflating or deflating an air cell within the seat. The adaptive seat system will only operate when the ignition switch is in the ON position.

The lumbar support in the seat back may be adjusted manually. Move the lumbar switch OUT in order to increase the support. Move the lumbar switch IN in order to decrease the support. The adaptive lumbar module will respond to the inputs by either adding air to the bladder or releasing air from the bladder in the seat back.

Move the lumbar switch up in the AUTO/ON position in order to have the adaptive seat adapt to the occupant. The adaptive lumbar module will automatically adjust the support by supplying a pulse width modulated signal to the lumbar pump motor in order to add air to the bladders or release air from the bladders. The adaptive lumbar module will check the position of the occupant every 4 minutes. If the occupant has moved, the adaptive lumbar module will then automatically adjust again.

Move the lumbar switch down in the OFF position in order to turn off the automatic adjustment. The adaptive lumbar module will release all air from the bladders.

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 backward by one motor. When the MSM receives an input to move the lumbar backward, 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, however, the voltage and ground will be applied on the opposite control circuits to the motor. The voltage polarity is reversed and the motor will run in 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 lumbar support. This decreases the stress on each motor. If a lumbar support reaches the end-of-travel due a soft stop and the seat switch is released and then activated again, the motor will run to move the lumbar support a short distance farther, to the end of it's physical travel limit.

The memory seat module (MSM) receives the lumbar support manual movement inputs from the lumbar switch. When a lumbar forward, backward, 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 .