Each seat incorporates a power inflate/power deflate pneumatic system. The system alters the contour of the seat with air bladders inflate and deflate within each seat.

Both of the power seats operation utilize the same power seat cushion air control module and pump assembly. The power seat cushion air control module and pump assembly are mounted under the passenger seat. A seat jumper harness from the passenger seat connects the circuitry and the bladder tubing to the driver's seat.

Voltage is supplied at all times to both of the lumbar inflator switches through CKT 1240 from the DEFOG/SEATS circuit breaker 12. The lumbar inflator switch applies voltage to the selected solenoid at the solenoid valve assembly for lateral/lumbar support.

The solenoid valve assembly is grounded through the power seat cushion air control module. Simultaneously the lumbar inflator switch applies battery voltage to the selected inflate or deflate relay within the power seat cushion air control module. The power seat cushion air 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 cushion air control module senses a bladder full/empty condition. In response, the power seat cushion air control module shuts off the pump by opening the ground to the inflate or deflate relay until the lumbar inflator switch is released.