Vehicle Diagnostic, Testing and Information System VAS5051 or VAG1551 Scan Tool, Connecting and Selecting Functions

Function

The headlight automatic vertical aim control system consists of:
- Automatic vertical headlight aim control system control module -J431-
- Left rear level control system sensor -G76-
- Left front level control system sensor -G78-
- Left headlight beam adjusting motor -V48-
- Right headlight beam adjusting motor -V49-

When the engine is started, a nominal value is created depending on the actual inclination of the vehicle. This value is sent to the headlight beam adjusting motors, and the headlight beam angle is adjusted once, whether the low beam is switched on or not.

After this initial adjustment, signals to change the low beam position will only be sent to the headlight beam adjusting motors if the low beam headlights are switched on.

If a trip is interrupted (vehicle speed less than 1 km/h) and a change in the vehicle inclination is recognized (i.e. additional passenger(s)), the headlights will automatically adjust to compensate for the increased load.

All control processes for the headlight automatic vertical aim control originate from static operating conditions.


NOTE: The following information relates solely to the VAG1551 scan tool.