Before an adjustment of the headlight is performed on vehicles with xenon lamps, a basic setting of the automatic regulation of the headlight range must always be done. The basic setting disconnects from the automatic control mechanism, to make an adjustment of the headlight possible. If a basic setting is not performed, the automatic regulation mechanism of the headlight will be damaged.
A basic setting must be done when:
The control unit for the regulation of the headlight range has been re-coded or dismounted/assembled.
A new headlamp has been assembled.
The headlamp has been dismounted and assembled again.
The left front level sensor has been replaced.
The left rear level sensor has been replaced.
A new holder for the level sensor has been assembled.
The link arm or the frame of the level sensor has been dismounted/assembled, changed.
Note:
The vehicle must not be moved during the adjustment; to open/close doors or lean on the vehicle is not allowed. When headlights, vehicle level sensor or control unit for the headlight are changed, a basic setting must be performed.
If the fault code 1539 is stored, a basic setting must be performed.
Test prerequisities:
Battery voltage above 11 V.
Ignition on, engine off.
No faults stored in the fault memory.
No sensor or stepmotor faults.
The control unit for the regulation of the headlight range must be coded.
The left front level sensor must have a value between 12,5-50%.
The left rear level sensor must have a value between 50-87,5%.
The headlamp´s lenses unbroken and clean.
Reflectors and bulbs ok.
Tyre pressure ok.
The handbrake must be released and no gear selected.
Wheels in a straight-ahead position.
Vehicle correctly loaded and springs settled (driver seat loaded with 75 kg).
Fuel tank at least 90% left.
Vehicle and headlight adjustment setter on a level surface and aligned.
Procedure:
Read and check the inclination measurement, which is embossed in percentage on the hood above the headlight. The percentage information derives to a projection distance of 10 metres. A value of for example 1,0 % corresponds to 10 centimetres.
Select the basic setting: "Adjust light setting".
The headlights are now put in adjustment position. The values for the level sensors are erased and the fault code 1539 is stored. This is confirmed with the text: "headlight adjustment".
Exit the basic setting.
Adjust the headlights according to the national legislation and regulations.
Select the basic setting: "Store setting".
The new headlight setting is stored and the values from the front and the rear level sensors are stored as new starting values. This is confirmed with the text: "Control position adjusted".
Exit the basic setting.
Turn off the ignition for 60 seconds to store the new values.
Re-establish diagnosis with the system. Read and check that no faults are stored.
Exit the function.