Power Lumbar Description AL2

The LH and RH power lumbar system each consist of the lumbar switch and two reversible motors (in/out and up/down) which operate independently of each other. Each motor contains an electronic circuit breaker (PTC), which 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 AC9

The LH and RH 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. It 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. To increase the support, move the lumbar switch OUT. To decrease the support, move the lumbar switch IN. The adaptive lumbar module will respond the inputs by either adding air to the bladder or releasing air from the bladder in the seat back.

To have the adaptive seat adapt to the occupant, move the lumbar switch up in the AUTO/ON position. The adaptive lumbar module will automatically adjust the support by supplying a pulse width modulated signal to the lumbar pump motor 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.

To turn off the automatic adjustment, move the lumbar switch down in the OFF position. The adaptive lumbar module will release all air from the bladders.

Power Lumbar Description A45

The memory seat system consists of the memory seat module (MSM) and two lumbar motors. Each lumbar motor has a position sensor attached to it. The MSM controls the movement of the two lumbar position motors, the lumbar in/out and lumbar up/down motor. The motors operate independently of each other. Each motor contains an electronic circuit breaker (PTC), which will reset only after voltage has been removed from the motor.

Both motors are reversible. For example, the lumbar is moved in and out by one motor. When the MSM receives an input to move the lumbar in, it supplies battery positive voltage (B+) and ground to run the lumbar in/out motor to move the lumbar in, away from the driver's back. When it receives a lumbar out 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 out, toward the driver's back. The lumbar up/down 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 LH lumbar switch. When a lumbar in, out, up, or down input is received, the MSM supplies battery positive voltage (B+) to the appropriate motor and the lumbar support moves accordingly.

Refer to Memory Seat Description .

Refer to Memory Seat Description .