Restraints Control Module (RCM)

RCM or air bag sensor contains a microcomputer, which monitors electrical system components and connections. RCM performs a system self-check of air bag system internal circuits every time ignition switch is turned to RUN position. RCM also illuminates AIR BAG warning light during initial system self-check and whenever a fault is detected. Faults are stored in RCM memory and translated into flash codes, which are displayed through AIR BAG warning light.

If a system fault exists and AIR BAG warning light is malfunctioning, RCM activates a chime in instrument cluster, indicating need for service.