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.
Position Sensor, Headlamp Leveling
There are two position sensors to enable automatic adjustment of the headlights. Adjustment is vertical depending on load and road conditions to reduce the risk of blinding glare for other drivers.
One position sensor is located next to the rear axle and is connected to the left rear control arm via a link system. The other position sensor is located next to the right front axle and is connected to the right front control arm via a link system.
Vehicle angle is measured by the sensors being actuated via the respective link system.
The position sensors are directly connected to Headlamp Control Module (HCM). Each position sensor has three connections.
Two are used for voltage feed and ground.
One is used for signals about the vehicle's angle.
In ignition position II, level control is active and an average value of the vehicle's angle is calculated using the sensors. At approx. 4 km/h, the dynamic level control is activated, which also performs fast corrections during acceleration and braking. Speed must be above approx. 4 km/h, dark is also required.
The position sensor can be calibrated using the diagnostic tool. The calibration is saved in the headlamp control module (HCM) and must be performed again upon replacement of the control module or position sensor.
There are diagnostics for the position sensors.
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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