Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Restraints Control Module
The Restraints Control Module (RCM), or diagnostic monitor, contains 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 energizes 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. RCM also communicates through Data Link Connector (DLC) current and historical Diagnostic Trouble Codes (DTCs).
If a system fault exists and AIR BAG warning light is malfunctioning, RCM signals Generic Electronic Module (GEM) to activate a chime, indicating need for service.
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.