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.
Automatic Driving Lights Control
The following conditions must apply for the low-beam headlights to be switched on:
- Light switch in position A automatic driving light control and
- Status "Terminal 15 ON" and
- Rain/driving lights/solar sensor or rain/light/solar/condensation sensor signals darkness.
Only the rain/light/solar/condensation sensor is used from now on in the description. The description also applies correspondingly for the rain/driving lights/solar sensor. Both sensors are connected over the LIN bus.
The footwell module switches on the low-beam light if the signal from the rain/light/solar/condensation sensor fails due to a defect.
The low beam lights are switched on together with the side lights by the automatic driving lights control system as soon as the rain/light/solar/condensation sensor detects a certain level of ambient brightness. The signal is sent from the rain/light/solar/condensation sensor via the LIN bus to the junction box electronics.
The junction box electronics routes the signal via the K-CAN2 to the footwell module. In turn, the footwell module evaluates the signal and switches on the driving lights.
The driving lights switched on by the automatic driving lights control system can be switched off with the light switch or by means of the rain/light/solar/condensation sensor.
The side lights can also remain on after "Terminal 15 OFF" because they were switched on by the automatic driving lights control function. The side lights are switched off automatically after opening the driver's door.
If a different door is used to exit the vehicle, the side lights will be switched off when the vehicle is locked.
The rain/light/solar/condensation sensor supplies the switch-on signal for the driving lights at a specific level of darkness.
The roof functions center is responsible for the voltage supply to the rain/light/solar/condensation sensor.
The junction box electronics queries relevant statuses via the LIN bus and transmits them over the K-CAN2.
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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.