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.
Functional Principle: Notes
The adaptive headlight-range adjustment system only becomes active when the light switch is in position "A" and the driving lights have been switched on by the rain/light/solar/condensation sensor.
Raising or lowering of the headlight beam pattern is based to a great extent upon the calculation of two signals. The signals are the driving speed as well as the longitudinal acceleration of the vehicle. These signals are used to calculate the incline and respectively the downhill gradient compared with the horizon. The footwell module continuously imports the signals via the K-CAN2 and uses them to calculate the current values for the adaptive headlight-range adjustment system. The values correspond to the incline angles over the time period. The incline angles may be positive, negative or zero. The difference between the individual incline angles is used by the footwell module to calculate whether it is necessary to adjust the headlights.
The signal from the ride-height sensors is incorporated into the calculation. This allows the pitch angle of the vehicle body, due to a vehicle load for instance, to be included in the calculation.
Data from the longitudinal acceleration sensor and the ride-height sensors are output through the integrated chassis management via the FlexRay. Data for the driving speed are provided by the integrated chassis management also via the FlexRay. The central gateway module transfers the data from the FlexRay to the K-CAN2. The footwell module receives the data via the K-CAN2.
Signals from the wheel speed sensors are registered by the Dynamic Stability Control for the driving speed signal. The Dynamic Stability Control outputs the data to the FlexRay. The integrated chassis management generates the driving speed signal from the data and makes the signal available to the vehicle electrical and bus systems. 1
Beam throw adjustment is soft to avoid the eyes becoming tired or irritated.
| Index | Explanation |
|---|---|
| 1 | Horizontal axis |
| 2 | Positive or negative incline (negative incline is the downhill gradient) |
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.