VOLVO
CEM-8F1B - Xenon lamp right Faulty signal
System
Central Electronic Module (CEM)
Volvo models this fault code applies to
Applies to the following models:
5 modelsS60 (2001–2009), S80 (1999–2006), V70 (2000–2008), V70 XC / XC70 (2001–2007), XC90 (2003–)
What does this fault code mean?
The central electronic module (CEM) has logged an incorrect reading from the right xenon lamp. The cause is a defective control box or a damaged gas discharge lamp (GDL) module, and the control box is the part that supplies the lamp with the right voltage and current.
Possible causes
- Defective control box for the xenon lamp
- Damaged control unit for the gas discharge lamp (GDL)
What you can do
- 1Switch between low and high beam with the ignition on to see whether the right lamp changes position
- 2Check that the right headlamp receives power and that its ground point is tight and clean
- 3Check that the connectors to the control box are firmly seated and clean, with no play or oxidation
- 4Use a multimeter to check that the supply wire to the control box has voltage with the ignition on
- 5If the fault remains after these checks, have a workshop replace the right headlamp
Symptoms you may notice4
- The low beam is constantly lit
- The high beam is constantly lit
- Road surface lighting does not work
- Headlamp aim is wrong or the height adjustment does not work
What the fault can affect1
- The shortest beam range is used
General guidance for car owners. Diagnosis on the car can point to a different cause.