Diagnostic Trouble Code (DTC) Information

Diagnostic trouble code (DTC) information HCM-B1D6477

Condition
The Headlamp Control Module (HCM) communicates with the Left headlamp control unit (LHCU).
The diagnostic trouble code (DTC) is stored if the control module detects that:
- The Left headlamp control unit (LHCU) registers that the requested position of the horizontal motor circuit cannot be achieved.
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
- None.

Possible source
- Blocked engine (the engine does not turn over)
- Damaged horizontal motor.

Fault symptom[s]
- Headlights/Vertical adjustment not influenced by steering wheel
- Headlights/Headlight aim is off
- Text window and warning symbol/Text message