Normal Operation

The restraints control module (RCM) monitors the HS-CAN for messages from the instrument cluster module, occupant classification sensor (OCS) module and the powertrain control module (PCM). If the RCM detects a communication bus fault or missing messages, it will store diagnostic trouble code (DTC) U1900 in memory and illuminate the air bag indicator.

Fault Conditions 

The RCM monitors for the following fault conditions:

• Missing message from the instrument cluster module
• Missing message from the PCM
• Missing message from the OCS module