Module, Air Suspension Control (ASCM): Operation

The ASCM battery positive voltage is received from a 20 amp Fuse (shared with another ECU) - located in the PDC on the right side of the engine. Multiple modules work together to increase vehicle stability and traction along with vehicle ride height. The ASCM uses several Controller Area Network (CAN) data bus systems for inputs and outputs of the information necessary for the different systems to operate. The use of a scan tool is necessary for diagnostics, and replacement of the ASCM (or any pressurized components of the system).

There is an air suspension exhausting function to maintain selected ride height up to 10 minutes after the ignition is placed in the Off position.

• This function would ease trailer removal when the engine is turned off.
• The air suspension would exhaust and would not continually rise as the tongue load is reduced when removing a trailer.
• This will not affect air suspension disabled modes; the air suspension will stay disabled if the air suspension is disabled before the ignition is placed in the Off position.
• The air compressor will not run after the last ride height adjustment (requested before the ignition is placed in the Off position) is completed.
• The air suspension system will finish any ride height adjustment requested prior to ignition-off and will then enter a "sleep" mode.
• Only the ASCM will be active during the remainder of the 10 minute period to facilitate any exhausting (lowering) required to maintain ride height.