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.
Checking Start Control Module (SCU)
To be able to remove the key, it may be necessary to directly supply the Start control module (SCU) with voltage.
Disconnect the 8-pin connector from Start control module (SCU) and supply with voltage +12 V on #B7 and ground on #B8.
If the key still does not come loose and the fuse, for the voltage supply to the ignition switch, blows the ignition switch should be replaced.
If the key becomes loose, fault trace the Central electronic module (CEM) and check the new cable from the Start Control Unit (SCU) #B8 to the Central electronic module (CEM) #B13 (#13) with regard to open circuit, connector resistance and oxidation.
Remedy as necessary.
Other information
- see IGNITION LOCK
Was a fault detected?
- YES
Refer to VERIFICATION
- NO
Refer to CHECKING THE COMPONENT
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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.