Diagnostic Trouble Code (DTC) Information

Diagnostic trouble code (DTC) information HCM-B104251

Condition
The Headlamp Control Module (HCM) checks internal components and functions.
The diagnostic trouble code (DTC) is stored if the control module detects that:
- An internal software fault has occurred.
The control module's test for the diagnostic trouble code (DTC) starts in the event of:
- Ignition switch position II.

Note! The control module can only detect the fault once the test has been started and the diagnostic trouble code (DTC) is stored when the conditions are met.





Substitute value
- Shortest headlamp range will be used.

Possible source
- Incorrect software in Headlamp Control Module (HCM).
- Damaged Headlamp Control Module (HCM).

Fault symptom[s]
- Automatic vertical aim control does not work
- Active Bi-Xenon light; No Functionality
- Text window and warning symbol/Text message