Restraints Control Module (RCM)
The RCM carries out the following functions:
- Deploys the airbag(s)/Safety Canopy® in the event of a deployable crash
- Activates the safety belt retractor pretensioner(s) to remove slack from the safety belt(s) in the event of a crash
- Monitors the SRS for faults
- Sends a message to the IPC to illuminate the airbag warning indicator if a fault is detected
The RCM monitors the SRS for possible faults. If a fault is detected, the RCM sends a request to the IPC to illuminate the airbag warning indicator. When the ignition is turned OFF and then ON, the IPC proves out the airbag warning indicator by illuminating for 6 seconds. If no faults are detected by the RCM , the IPC turns the airbag warning indicator off and it remains off. If the RCM detects a fault, it sends a message to the IPC to turn the airbag warning indicator on and it remains on for the rest of the ignition cycle. If the RCM requests illumination of the airbag warning indicator and the airbag warning indicator does not function, the IPC automatically activates an audible chime.
The RCM includes a backup power supply. This feature provides sufficient backup power to deploy the airbags in the event the ignition circuit is lost or damaged during impact. The backup power supply depletes its stored energy approximately one minute after power and/or ground has been removed from the RCM .