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.
Steering Column Module (CIM)
When an ignition key is inserted into the ignition lock cylinder and the ignition is switched ON, the transponder embedded in the head of the remote key is energized by the TDM exciter coils surrounding the ignition lock cylinder. The energized transponder transmits an encrypted signal that contains its unique value, which is received by the CIM. The CIM then compares this value to the learned value stored in memory. The CIM then performs one of the following functions:
- If the transponder value matches the values stored in the CIM memory, the CIM will send the pre-release password to the ECM via serial data.
- If the transponder's unique value does not match the value stored in the CIM, the CIM will send the fuel disable message to the ECM via the serial data circuit.
- If the CIM is unable to measure the ignition key transponder value, the CIM will not send any messages to the ECM.
Up to 5 remote keys may be learned to a single vehicle.
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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.