Basic setting of light beam length


Cars equipped with Xenon lights shall, according to law, have a system for automatic length control to even out not only static loads but also dynamic loads that occur when braking and accelerating. This is to avoid blinding on-coming cars. The control unit for light beam length control uses several different parameters, and actuators, to regulate the headlights' setting.

For the following basic setting, the control function is turned off and the headlights are controlled to adjusting position.

Adjustment of headlights should be performed when:

Test conditions:

Procedure:

  1. Read off and check the angle measurement that is stamped in percent on the casing above the headlight. The percentage refers to a projection distance of 10 metres. A measurement of, e.g., 1.2% corresponds to 12 centimetres.

  2. Start the function.

  3. A dialogue box is shown with the instruction to turn on low beams, press "OK".

  4. The headlights are now set to adjusting position.

  5. When adjusting position is reached, an instruction appears to adjust the headlights mechanically. Adjust the headlights mechanically.

  6. After setting the headlight, press "OK" to save the new control position. This is confirmed with the text "Control position saved".

  7. The function is done.

  8. Read out and check that no fault codes are stored.

    • If the function fails, check the test conditions and repair any faults.