Diagnostic Trouble Code (DTC) Information

Diagnostic trouble code (DTC) information HCM-B104401

Condition
The Headlamp Control Module (HCM) checks the signal from the position sensors.
The diagnostic trouble code (DTC) is stored if the control module detects that:
- The signal from the rear position sensor is 0 V or above 5 V.
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
- Short-circuit to battery voltage in the signal cable to the front / rear position sensor.
- Short-circuit to ground in the signal cable to the front / rear position sensor.
- Contact resistance or oxidation in the terminals or connections.
- Open-circuit in the signal cable to the front / rear position sensor.
- Damaged sensor.

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