SUBJECT:
Flash: Air Suspension Control Module (ASCM)
This bulletin involves updating the ASCM with the latest available software.
SYMPTOM/CONDITION:
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.
