Diagnostic Trouble Code (DTC) Information

Diagnostic trouble code (DTC) information HCM-B103C13

Condition
The Headlamp Control Module (HCM) communicates with the Left headlamp control unit (LHCU). The left headlamp control unit (LHCU) checks the headlamp motors.
The diagnostic trouble code (DTC) is stored if the control module detects that:
- No communication with the Left headlamp control unit (LHCU).
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
- Open-circuit in the signal cable.
- Contact resistance or oxidation in the terminals or connections.
- Damaged Left headlamp control unit (LHCU).

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