VOLVO
CEM-B103C1C - Left Headlamp Control. General Electrical Failures. Circuit voltage out of range
System
Central Electronic Module (CEM)
Volvo models this fault code applies to
Applies to the following models:
2 modelsV40 (2013–), V40 Cross Country (2013–)
Show models by year and engine (2)
What does this fault code mean?
The voltage to the left main headlamp control unit (LHCU) is outside the range the unit accepts, according to the fault code. Headlamp adjustment may be affected, and the cause may be a supply wire shorted to earth or voltage.
Possible causes
- Incorrect voltage supply to the left main headlamp control unit (LHCU)
- Supply wire shorted to earth or voltage
- Damaged left main headlamp control unit (LHCU)
What you can do
- 1Check that the fuses for the headlamp supply are intact
- 2With the ignition on, check the wires to the left headlamp for chafing, pinching and loose connections
- 3With the ignition on, use a multimeter to check whether the supply wire is shorted to earth or has voltage when it should not
- 4Remedy the fault and clear the fault code. If it returns with an intact cable, have a workshop replace the left headlamp control unit
Symptoms you may notice3
- 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
What the fault can affect2
- The headlamp light range is held fixed
- Side adjustment stops in the straight-ahead position
General guidance for car owners. Diagnosis on the car can point to a different cause.