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.
Interior Protection Sensor With Integrated DWA Control Unit
The interior protection sensor is an ultrasound-based (USIS) motion detector which detects all movements inside the vehicle interior and evaluates them using the DWA logic.
The DWA generates an alarm if the interior sensor detects a movement which meets the triggering criteria, or if alarm triggers are indicated via the K-CAN SYSTEM or DWA K-Bus.
The DWA control unit is supplied voltage by the Power Module (KL 30).
An electronic fuse for the DWA is inside the Power Module.
For reasons of safety, KL 30 is not disconnected for the DWA by the Power Module when consumer cutoffs are performed.
If the DWA detects a drop in the battery voltage below a certain value, then line monitoring of the DWA K-Bus is deactivated in order to avoid a false alarm. This limit value is set to 8.5 V.
Arming of the DWA is not possible at KL R or KL 15.
NO RELATED
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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.