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.
Siren control module (SCM)
The siren is used as the acoustic source for the alarm function. The siren is located in a protected position under the fender liner in the right front wheel housing.
The siren begins to sound if the power supply is cut or if communication with the upper electronic module (UEM) stops when the alarm is activated. The siren has an internal battery that is charged when the ignition is switched on. This battery can complete approximately 10 alarm cycles and has a limited service life depending on the climate in which it is used. The battery cannot be replaced as a separate component. The cause of the alarm can be read off and verified via VIDA.
The siren is powered via a fuse from the central electronic module (CEM) The siren is grounded in the engine compartment.
There are diagnostics for the siren (SCM).
Use the Manual With the Right Hardware
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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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