Diagnostic Trouble Code (DTC) Information

Diagnostic trouble code (DTC) information HCM-DD20

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 Right headlamp control unit (RHCU).
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.

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
- Communication interference.

Fault symptom[s]
- Active Bi-Xenon light; No Functionality
- Message in information display
- Indicator lamp Active Bi-Xenon light; Flashing