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 start button and card holder is the unit which is used by the driver to start the vehicle. See also DESIGN AND FUNCTION, IMMOBILIZER/START INHIBITION .
Start control module (SCU) activate the voltage supply to certain functions in the engine control module (ECM) via fuses in the front relay/fuse box and central electronic module (CEM). Start control module (SCU) supplies the engine control module (ECM) with a start signal.
Start control module (SCU) transmits a high signal (Ubat ) to engine control module (ECM) when 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. Also refer to: FUNCTION
Start control module (SCU) is supplied with voltage from the fuse in the front relay / fuse box.
The central electronic module (CEM) can diagnose the start control module (SCU).
Use the Manual With the Right Hardware
Pair factory procedures with proven DIY tools so the instructions are easier to execute.
Disclosure: Verified tool recommendations may earn an affiliate commission at no cost to you.
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.
Rather have a pro handle this?
A certified mobile mechanic comes to your home or office. They bring the tools, you stay comfortable. No tow truck, no waiting room, no surprises.
No obligation. See pricing before you book.