Ride Height Sensor: Description and Operation

Fig. 4 Electronic height sensor:

10 C The electronic height sensor, Fig. 4, controls two basic circuits: the compressor relay ground circuit and the exhaust solenoid coil ground circuit. On some models, the sensor also controls the indicator light ground circuit. To prevent falsely activating the compressor relay or exhaust solenoid during normal ride motions, the sensor circuitry provides a predetermined delay before either circuit can be completed. 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.