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
The central electronic module (CEM), engine control module (ECM), keyless vehicle module (KVM) (cars with the keyless entry system only) and steering column lock module (SCL) are linked together by codes to increase the security of the immobilizer system. Codes must be programmed in when replacing a control module in order for the vehicle to be started. The serial number of the brake control module (BCM) is also checked by the engine control module (ECM) before it allows the engine to be started. The serial number of the brake control module (BCM) must be entered into the engine control module (ECM) if the brake control module (BCM) or engine control module (ECM) are replaced. This occurs automatically when downloading software into the new control module.
The steering column lock module (SCL) is only available on model year 2004-2008 for the USA/CDN market and model year 2004- for other markets.
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
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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.