The solid-state sensor detects height changes at the rear of the vehicle and, in turn, controls the functions of the compressor and exhaust solenoid. To prevent energizing the compressor relay or exhaust solenoid during normal ride motions, the sensor circuit provides a fixed delay before ground is completed to either circuit.

In addition, the sensor limits compressor run time and exhaust solenoid energized time to a range of 4.5-7.5 minutes. This prevents continuous compressor operation in case of a severe system leak or continuous exhaust solenoid operation. The timer circuitry is reset whenever the ignition is cycled OFF and ON, or the sensor exhaust or compress output signal changes.

The sensor is mounted to the left front side of the rear suspension support assembly. The actuation arm is attached to the left rear control arm by a short link.