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.
Anti-theft System Circuit Diagram
| Index | Explanation |
|---|---|
| 1 | Hood switch |
| 2 | Car Access System 4 (CAS4) |
| 3 | Anti-theft system (DWA) LED |
| 4 | Junction Box electronics (JB) |
| 5 | Front power distribution box |
| 6 | Door contact, passenger's door |
| 7 | Door contact, rear passenger's side |
| 8 | Rear power distribution box |
| 9 | Emergency power siren with integrated tilt alarm sensor (SINE) |
| 10 | Trunk lock with trunk-lid switch |
| 11 | Door contact, rear driver's side |
| 12 | Door contact, driver's door |
| 13 | Footwell module (FRM) |
| 14 | Roof function center (FZD) with ultrasonic interior movement detector USIS |
| LIN-Bus | Local Interconnect Network bus |
| K-CAN2 | Body CAN2 |
| KI. 30 | Terminal 30 |
The anti-theft system on the F01/F02 is equipped with an ultrasonic interior movement detector for monitoring the vehicle interior. The ultrasonic interior movement detector USIS is fully integrated in the FZD.
The anti-theft system is equipped with an ultrasonic interior movement detector. The ultrasonic interior movement detector has been fully integrated into the FZD.
The door switches (6, 7, 11, 12, Hall-effect sensors) are monitored by the footwell module (13). As soon as the status of a Hall-effect sensor changes, the ultrasonic interior movement detector (14) receives that information via the K-CAN2. If the anti-theft system is activated, an alarm is triggered.
The hood switch (1) is monitored by the Car Access System 4 (2). If the status changes, an alarm is triggered in the same way.
Opening of the trunk lid is monitored by the Junction Box electronics (4). If the status of the trunk-lid switch (10) changes, it triggers an alarm.
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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.