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.
Diagnostic Functions: Programming
To increase the security of the immobilizer system, the following control modules are linked to each other with codes.
- central electronic module (CEM)
- engine control module (ECM).
- Keyless vehicle module (KVM) (only vehicles with the keyless locking system)
- ignition antenna unit (IAU)
- steering Column Lock Module (SCL) (does not apply to USA/CAN-market).
Codes must be programmed when replacing the control module in order for the vehicle to start. Furthermore, the serial number for the Brake control module (BCM) is checked by the Engine control module (ECM) before the Engine control module (ECM) permits the vehicle to start. This requires that the serial number in the Brake control module (BCM) be entered into the Engine control module (ECM) when replacing the Brake control module (BCM) or replacing the Engine control module (ECM). This occurs automatically when downloading software into the new control module.
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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.