LED headlamps or the control units have to process a multitude of data from different in-vehicle sources in order to calculate and realise the individual light functions. Here you will find important information to consider when replacing the headlamp and components.
If the main headlight needs to be replaced, special work steps are required for diagnosis and repair. The following information refers to an Audi A6 Avant model year 2015 as an example, but applies analogously to other vehicle models with identical headlight systems.
The Matrix LED headlamp and the other vehicle lighting are monitored by higher-level control units in the vehicle system. Any faults that occur are stored in the fault memory of the control unit and can be read out with suitable diagnostic equipment. On some vehicle models, the driver is informed of a system fault by an additional warning in the instrument cluster display.
Before fault diagnosis with the diagnostic device, a visual inspection of the individual system components should first be carried out, as some faults can already be detected and rectified in this way.
With this function, the error codes stored in the error memory can be read out and deleted.
In addition, information on the error code can be called up. In the case example, the electrical plug connection on the headlamp was disconnected, resulting in a fault code being stored in the fault memory.
Error code: 5545009/ B149C31
LED headlight module left
> electrical fault or interruption
With this function, current measured values such as the "Horizontal angle reference segment headlamp" can be selected and displayed on the left or right.
With this function, the various segments of the Matrix LED headlamp can be controlled by the diagnostic device. Thus, a functional check of the periphery as well as the corresponding system component can be carried out without much disassembly effort.
After carrying out the following repair work, the Matrix LED headlamp must subsequently be readjusted. This is the only way to ensure safe operation of the headlamp.
Before readjusting the headlamp, the following conditions must first be met on the vehicle:
the vehicle and the headlamp leveller are on a level surface
In order to adjust the headlights, a diagnostic device is required in addition to a headlight adjustment device. The adjustment process is started by the diagnostic device and carried out according to predefined work sequences. If the vehicle is equipped with level control, the chassis is driven to normal level and the control is deactivated before the adjustment. After a successful adjustment, the control is activated again.
