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.

2004 Mercury MontereyFACTORY OEM SERVICE PROCEDURE

Restraint Control Module (RCM) C310a

WARNING: This page is about a different car, the 2004 Lincoln LS. However, it is still accessible from the selected car via links, so may be relevant.

Fig 1: Identifying Restraint Control Module (RCM) C310A Connector Pins

Courtesy of FORD MOTOR CO.

RESTRAINT CONTROL MODULE (RCM) C310A PINS DESCRIPTION

Pin Number(s)	Circuit Designation/Description	Normal Condition/Measurement
11	4-EE1 (GY/RD) ISO 9141 communication circuit.	Less than 5 ohms between the DLC and the RCM. Greater than 10,000 ohms to ground with all network modules disconnected.

Factory Service Tools

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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.