The solid-state sensor or sensors 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.

On vehicles not equipped with Road Sensing Suspension, 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.

On vehicles equipped with Road Sensing Suspension, a sensor is mounted on both sides of the of the suspension support assembly.