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Normal Operation And Fault Conditions

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With the ignition ON, the AHCM sends messages to the SASM through the GWM over the MS-CAN. If the SASM does not receive these messages within a certain time frame (usually less than 1 second), the module sets DTCs. For information on the messages sent to the SASM by the AHCM, refer to the Description and Operation in the  Anti-Lock Brake System (ABS) and Stability Control  article. 

PPT DA ABS MODULE DTC FAULT TRIGGER CONDITIONS

DTC Description Fault Trigger Conditions
U0425:00 Invalid Data Received From Auxiliary Heater Control Module: No Sub Type Information This DTC sets when the SASM does not receive any data messages from the auxiliary heater control module within the allotted time.