Flash: Air Suspension Control Module (ASCM)
This bulletin involves updating the ASCM with the latest available software. Customers may experience no ride height change with the vehicle in real cold conditions and in addition they may also have a Malfunction Indicator Lamp (MIL) illumination. Upon further investigation the technician may find that the following Diagnostic Trouble Codes (DTCs) have been set:
· C15A1-00 - Unable To Obtain Desired Ride Height.
· C1562-98 - Ride Height Air Pump Control - Component Or System Over Temperature.
· C1562-92 - Height Air Pump Control - Performance Or Incorrect Operation.
· C159F-92 - Air Suspension Reverse Valve 1 Control - Performance Or Incorrect Operation.
· C15A0-92 - Air Suspension Reverse Valve 2 Control - Performance Or Incorrect Operation.
· C155E-92 - Height Pressure Vent Control - Performance Or Incorrect Operation.
· C15AA-00 - Air Leak During Vent.
In addition, the customer may notice the following condition:
· Vehicle does not change ride heights when selected in cold weather.
