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.
Start Control Module (SCU)
The start control module (SCU), with its starter button, is the unit that the driver uses to start the vehicle. Also see appropriate Design and Function information for the Immobilizer/start inhibition.
The start control module (SCU) activates the power supply to certain functions in the engine control module (ECM) via fuses in the front integrated relay/fusebox and central electronic module (CEM). The start control module (SCU) also supplies the engine control module (ECM) with start signals.
The start control module (SCU) transmits a high signal (Ubat ) to the engine control module (ECM) when the start control module (SCU) is in position III.
The engine control module (ECM) will activate the starter motor relay. In turn the relay activates the starter motor. See also: FUNCTION
The start control module (SCU) is supplied with power from the fuse in the front integrated relay/fusebox.
The central electronic module (CEM) can diagnose the start control module (SCU).
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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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