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.
System overview: General
The immobilizer system increases the level of the vehicle safety system by making it extremely difficult to use the vehicle unless a valid key, which belongs to the vehicle, is used to start it. The identity of the key is checked when the vehicle is started, and if the key is not approved the engine will not start. The customer will not notice this function as long as a valid key is used an no fault occurs.
The immobilizer system includes:
- Central electronic module (CEM)
- Engine control module (ECM)
- Antenna ring
- Driver information module (DIM)
- Remote-controlled immobilization (2010-, option, only certain markets)
Definitions:
Activated system: The system means that the vehicle cannot be started.
Deactivated system: Key check has been carried out and the key has been approved. The system permits the car to start.
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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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