Power Seats: Ultima

CIRCUIT OPERATION

Each seat incorporates a power inflate/power deflate pneumatic system used for altering the contour of the seat. This is accomplished by inflating and deflating air bladders within each seat.

Both Power Seats utilize the same Power Seat Control Module and Pump Assembly for operation. The Power Seat Control Module and Pump Assembly are mounted under the Driver Seat. A Seat Jumper Harness from the Driver Seat connects the circuitry and bladder tubing to the Passenger Seat.

Voltage is supplied at all times to both Power Seat Switches through CKT 1240 from the DEFOG/SEATS Circuit Breaker 12. When lateral/lumbar support is requested, the Power Seat Switch applies voltage to the selected solenoid at the Solenoid Valve Assembly.

The Solenoid Valve Assembly is grounded through the Power Seat Control Module. At the same time, the Power Seat Switch applies battery voltage to the selected inflate or deflate relay within the Power Seat Control Module. The Power Seat Control Module applies power to the Pump Assembly in either the forward direction (inflate) or the reverse direction (deflate).

The ground to the Solenoid Valve is electrically opened when a pressure switch inside the Power Seat Control Module senses a bladder full/empty condition. In response to these conditions the Power Seat Control Module shuts off the pump by opening the ground to the Inflate or Deflate Relay until the Power Seat Switch is released.