Diagnostic Trouble Code (DTC) Information

Diagnostic trouble code (DTC) information HCM-DD10

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:
- 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:
- 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.
- Contact resistance, oxidation or open-circuit in the terminals.

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