Diagnostic Trouble Code (DTC) Information

Diagnostic trouble code (DTC) information HCM-B1D6501

Condition
The Headlamp Control Module (HCM) communicates with the Right headlamp control unit (RHCU).
The diagnostic trouble code (DTC) is stored if the control module detects that:
- The Right headlamp control unit (RHCU) registers that the horizontal motor circuit has incorrect voltage or too high temperature.
The control module's test for the diagnostic trouble code (DTC) starts in the event of:
- Ignition switch position II.
- Battery voltage higher than 10 V.

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
- Faulty power supply.
- Temperature too high.
- Short-circuit to supply voltage in the signal cable.
- The signal cable is short-circuited to ground.
- Contact resistance or oxidation in the terminals or connections.
- Open circuit on signal cable.
- Damaged Right headlamp control unit (RHCU).

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