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Normal Operation and Fault Conditions

With the ignition ON, the APIM sends messages to the SASM through the GWM and over the HS-CAN 2. If the SASM does not receive these messages within a certain time frame (usually less than 1 second), the SASM sets DTCs. For information on the messages sent to the SASM by the APIM, refer to the Network Message Chart in  DESCRIPTION AND OPERATION  . 

PPT BC SASM DTC FAULT TRIGGER CONDITIONS

DTC Description Fault Trigger Conditions
U0253:00 Lost Communication With Accessory Protocol Interface Module: No Sub Type Information Sets in continuous memory and on demand when the SASM detects any of the APIM messages are missing. This can be due to a APIM failure, a circuit failure on the HS-CAN or an excessive load on the network.
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