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.
LIN-bus Connections
| Index | Explanation |
|---|---|
| ASP_FA | Driver's door mirror |
| ASP_BF | Front passenger door mirror |
| BE_FAS | Operating unit for driver assistance systems |
| FRM | Footwell module |
The operating unit for the driver assistance systems is fitted with a button that can switch the Active Blind Spot Detection system on and off.
The operating unit is connected via the LIN bus to the footwell module (FRM). A bus signal from the FRM to the ICM is used to inform that the button has been pressed.
The ICM only permits the Active Blind Spot Detection to be switched on, if the system is working faultlessly. Only then does it send a positive response via a bus signal to the FRM, to activate the function illumination on the button.
If instead there is a fault with the system, the function illumination remains off despite being pressed. The driver will then know that the system is not available.
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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.