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Normal Operation and Fault Conditions

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With the ignition ON, the BCM sends messages to the SASM over the HS-CAN. If the SASM does not receive these messages within the specified time frame, the module sets a DTC. This can be due to a BCM failure, a circuit failure on the HS-CAN or an excessive load on the network. For information on the cruise control messages sent to the SASM by the BCM, refer the  DESCRIPTION AND OPERATION  . 

PPT T SASM DTC FAULT TRIGGER CONDITIONS

DTC Description Fault Trigger Conditions
U0140:00 Lost Communication With Body Control Module: No Sub Type Information Sets when the SASM does not receive any messages from the BCM.