Diagnostic Trouble Code (DTC) Information

Diagnostic trouble code (DTC) information HCM-6503

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 position sensor in Right headlamp control unit (RHCU) is outside the tolerance level.
The control module's test for the diagnostic trouble code (DTC) starts in the event of:
- Activated control module.

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
- Limited functionality in the Headlamp Control Module (HCM) (Limp-home).

Possible source
- The signal cable is short-circuited to ground.
- Short-circuit to supply voltage in the signal cable.
- Open circuit on signal cable.
- Damaged Right headlamp control unit (RHCU).

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