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.
Restraint Control Module (RCM)
The RCM uses the high speed CAN for communication with the diagnostic tool and other modules on the high speed CAN. The RCM controls the deployment of the air bags based on sensor input.
Check the high speed CAN circuits between the RCM C310b and the DLC C251. The total resistance values must not be more than 5 ohms. If the resistance is more than 5 ohms, there is an open circuit in the high speed CAN, damage to the DLC C251, damage to the RCM C310b, or a problem in the in-line connector.
For additional RCM information, refer to SUPPLEMENTAL RESTRAINT SYSTEM .
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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.
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