Diagnostic Trouble Code (DTC) Information

Diagnostic trouble code (DTC) information HCM-B103C83

Condition
The Headlamp Control Module (HCM) both transmits and receives information via a standardized serial communication method - LIN (Local Interconnect Network). The control module checks the communication with the Left headlamp control unit (LHCU).
The diagnostic trouble code (DTC) is stored if the control module detects that:
- Received message does not correspond with expected message.
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
- Shortest headlamp range will be used.

Possible source
- Communication interference.

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