Town Car V8-4.6L VIN W (1997)
Ride Height Sensor: Description and Operation
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:
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Vehicle is at trim height.
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Vehicle is below trim height.
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Vehicle is above trim height.
The air suspension height sensor is installed and operates as follows:
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Is connected to the frame crossmember at one end and at the rear suspension arm and bushing arm at the other end.
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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.
The signal generated by movement of the magnets determines switch opening and closing as follows:
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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.
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Downward movement of the magnets will open the other switch to indicate a low condition.
