Vehicle Dynamics Module (VDM)

WARNING: This page is about a different car, the 2010 Lincoln Town Car. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: Before diagnosing the air suspension system, carry out the Vehicle Dynamics Module (VDM) self-test. If a DTC is present, follow the diagnosis and testing procedures. If no DTC is present, check the vehicle ride height by following the Ride Height Adjustments procedure.

If the system cannot reach the correct ride height, check all of the air tubes and connections for leaks, blockage or damage, height sensor integrity and/or compressor relay operation before installing a new air compressor.

A microprocessor controls the air suspension system. The microprocessor and supporting hardware are contained in the VDM. The VDM responds to signals from various sensors in the vehicle to maintain the programmed ride height while the vehicle is either moving or stopped. The VDM accomplishes this by opening and closing solenoid valves to control the amount of air in the air spring(s). The VDM turns on the compressor by applying voltage through the compressor relay to inflate the air spring(s) and raise the vehicle. The VDM opens the vent solenoid to lower the vehicle by releasing air from the air spring(s) in response to signal inputs from the air suspension height sensor. The VDM has a preprogrammed trim height.