Electric Passenger Seat Adjustment

The CJB supplies 3 power supplies to the passenger seat switchpack. The fused supplies provide power for the seat height and backrest recline, the seat forward/rearward and seat tilt and the head restraint and lumbar adjustment respectively. The CJB only provides the power to the passenger seat switch pack when the ignition is on (power mode 6).

For the seat movement and head restraint motors, when the applicable switch is operated, the power is supplied to the applicable side of the motor and the ground path is completed to operate the motor in the required direction. To move the motor in the opposite direction the polarity is reversed.

For the lumbar adjustment, when the switch is operated in the inflate position, power is supplied to the pump motor to inflate the lumbar support. When the switch is operated in the opposite direction, the power energizes a solenoid which in turn opens a valve to deflate the lumbar support.

On models with the passenger seat away switch, operation of the switch completes one of two ground paths to the passenger seat module. The module determines which ground path has been activated and operates the seat fore/aft motor in the applicable direction. The motor operates for as long as the switch is pressed or the motor reaches the full range of its adjustment.