Ride Height Sensor: Description and Operation

DESCRIPTION
The air suspension height sensor sends signals to the control module through Circuits 427 (PK/BK) and 428 (O/BK). There are three possible conditions that the control module interprets from signals from the air suspension height sensor:
- Vehicle is at trim height.
- Vehicle is below trim height.
- Vehicle is above trim height.

OPERATION
The air suspension height sensor is installed and operates as follows:
- Is connected to the frame crossmember at one end and at the LH rear suspension arm and bushing at the other end.
- The air suspension height sensor gets shorter when the rear of the vehicle lowers and longer when the rear of the vehicle rises.
- Magnets mounted in the lower slide portion of the air suspension height sensor move relative to the air suspension height sensor housing.
- This movement generates a signal that is sent to the control module through two small Hall effect switches attached to the air suspension height sensor housing.
- he signal generated by movement of the magnets determines switch opening and closing as follows:
- At trim height, the switches remain closed and the control module receives a trim signal.
- Upward movement of the magnets will open one switch to indicate a high condition.
- Downward movement of the magnets will open the other switch to indicate a low condition.