VOLVO
CEM-8A02 - Main beam relay. Signal too high. Intermittent fault
System
Central Electronic Module (CEM)
Volvo models this fault code applies to
This fault code has different meanings depending on model, model year or engine. Select the meaning that applies to your car.
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 main beam relay must be activated for the code to be set. CEM then registers that the high beam is short-circuited to battery voltage. The fault is intermittent, so it may have occurred earlier without being active now, and the front lamps then do not work.
Possible causes
- The main beam relay circuit is short-circuited to voltage
What you can do
- 1Check that the high beam relay is correctly fitted in the fuse box and that its contacts are not corroded
- 2Check the relay connections for chafing, loose connections and corrosion
- 3With the ignition off, use a multimeter to check that the relay wires have no contact with voltage
- 4If the relay is damaged it should be replaced, and then check that the high beam works
Symptoms you may notice1
- Front lamps do not work
General guidance for car owners. Diagnosis on the car can point to a different cause.