Ride Height Sensor: Description and Operation

Fig. 4 Electronic height sensor:

The electronic height sensor controls two basic circuits: the compressor relay ground circuit and the exhaust solenoid coil ground circuit. To prevent falsely activating the compressor relay or exhaust solenoid during normal ride motions, the sensor circuitry provides a delay before either circuit can be completed. The length of this delay is 7 - 15 seconds on all models. Also, the sensor electronically limits the compressor run time or solenoid exhaust valve energized time to a predetermined length of time to prevent extended operation if a system malfunction should occur. The run time is limited to between 2 and 7 minutes depending on model. The electronic height sensor is mounted to the frame crossmember in the rear and is connected to the axle housing or upper control arm by a short link.