VOLVO
CEM-B101288 - Left Headlamp Control. Bus Signal / Message Failures. Bus off
System
Zentralelektronik (CEM)
Volvo-Modelle, für die dieser Fehlercode gilt
Gilt für folgende Modelle:
2 ModelleV40 (2013–), V40 Cross Country (2013–)
Modelle nach Baujahr und Motor anzeigen (2)
Was bedeutet der Fehlercode?
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.
Mögliche Ursachen
- LIN bus shorted to voltage or earth
- Damaged left main headlamp control unit (LHCU)
Was Sie tun können
- 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
Symptome, die Sie bemerken können3
- 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
Was der Fehler beeinflussen kann2
- The light range stays fixed at one constant level
- Side adjustment is locked in the straight-ahead position
Allgemeine Hinweise für Fahrzeughalter. Die Diagnose am Fahrzeug kann eine andere Ursache zeigen.