Diagnostic Trouble Code (DTC) Information

Diagnostic trouble code (DTC) information HCM-U300317

Condition
The Headlamp Control Module (HCM) checks its own system voltage by comparing the DC voltage 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:
- Direct voltage to control module is higher than 16.0 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
- The charging system is overcharging.
- Damaged generator (GEN).
- Damaged battery.

Fault symptom[s]
- Automatic vertical aim control does not work
- Active Bi-Xenon light; No Functionality
- Text window and warning symbol/Text message