Diagnostic Trouble Code (DTC) Information

Diagnostic trouble code (DTC) information HCM-U300362

Condition
The Headlamp Control Module (HCM) checks the internal system voltage by comparing it to the system voltage in the Central electronic module (CEM).
Information about the system voltage in the Central electronic module (CEM) is transmitted via CAN to the Headlamp Control Module (HCM).
The diagnostic trouble code (DTC) is stored if the control module detects that:
- The system voltage differs by more than 2.5 V.
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
- Contact resistance, oxidation or open-circuit in the terminals.

Fault symptom[s]
- Headlights/Headlight aim is off
- Headlights/Vertical adjustment not influenced by steering wheel