VOLVO
CEM-B101288 - Left Headlamp Control. Bus Signal / Message Failures. Bus off
System
Sentral elektronikk (CEM)
Volvo-modeller feilkoden gjelder for
Gjelder følgende modeller:
2 modellerV40 (2013–), V40 Cross Country (2013–)
Vis modeller per årsmodell og motor (2)
Hva betyr feilkoden?
This fault concerns the left main headlamp control unit (LHCU), which the central electronic module (CEM) communicates with over the LIN bus. The fault is stored when the bus is shorted to voltage or earth, which affects the headlamp adjustment.
Mulige årsaker
- LIN bus shorted to voltage or earth
- Damaged left main headlamp control unit (LHCU)
Hva du kan gjøre
- 1With the ignition off, check that the wiring to the left headlamp has no chafing, pinching or contact with the body
- 2With the ignition off, use a multimeter to check whether the LIN wire to the left headlamp has contact with earth or voltage
- 3Check that the connectors to the headlamp are secure and not corroded
- 4Clear the fault code and road test to see whether it returns
- 5If the fault remains, have a workshop isolate the bus and check the left headlamp control unit, as this needs diagnostic equipment and sometimes new software
Symptomer du kan merke3
- Headlamp side adjustment does not follow the steering wheel correctly, or does not work
- Headlamp height adjustment is wrong or does not work
- Main beam with automatic high beam control does not work
Hva feilen kan påvirke2
- The light range stays fixed at one constant level
- Side adjustment is locked in the straight-ahead position
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