VOLVO
CEM-B103D1C - Right 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 right main headlamp control unit (RHCU) is outside the range the unit accepts, according to the fault code. Side and height adjustment and automatic high beam can be affected. The cause may be an incorrect supply, a short circuit in the wire or a damaged control unit.
Possible causes
- Incorrect voltage supply to the right main headlamp control unit (RHCU)
- Supply wire shorted to earth or voltage
- Damaged right main headlamp control unit (RHCU)
What you can do
- 1Check that the fuses for the headlamp supply are intact
- 2With the ignition on, check the wires to the right headlamp for chafing, pinching and loose connections
- 3With the ignition off, 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 right headlamp control unit
Symptoms you may notice3
- Side adjustment of the right headlamp does not follow the steering wheel correctly, or does not work
- Height adjustment of the right headlamp is wrong or does not work
- Main beam with automatic high beam control does not work
General guidance for car owners. Diagnosis on the car can point to a different cause.