Headlamp Alignment Control Module: Testing and Inspection

On Board Diagnostic Function

The automatic vertical headlight beam adjusting control module of the HID headlight system is controlled by an internal microprocessor with On Board Diagnostic (OBD) capability. If malfunctions occur in monitored components, Diagnostic Trouble Codes (DTC) will be stored in memory.

Troubleshoot system malfunctions, code control modules or perform basic settings with OBD program. Use VAS 5051 Vehicle Diagnostic Testing and Information System or VAS 5052 Vehicle Diagnostic and Service System in mode "Guided Fault Finding".

- Enter appropriate model, equipment and model year information and press">" to confirm.

After the DTC memory of all control modules has been checked:
- Press "Go to" button
- Select "Function / Component Selection"
- Select: "Body (Repair Group 01;27; 50 to 97)"
- Select: "Electrical System (Repair Group 01;27; 90 to 97)"
- Select: "01 - On Board Diagnostic (OBD) capable systems"
- Select: "Automatic vertical headlight aim control"
- Select appropriate option
- Follow tester prompts