VOLVO
CEM-8FF1 - Light emitting diode, Rain sensor button. Signal too low
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 CEM monitors the LED in the rain sensor button and has registered too low a signal from it. The LED is shorted to ground, so the light in the button does not come on.
Possible causes
- LED in the rain sensor button shorted to ground
What you can do
- 1Check whether the LED in the rain sensor button lights with the ignition on; if it does not, that points to the fault
- 2Clear the code and check whether it returns with the ignition on
- 3Check that the contacts in the button are clean and firmly seated
- 4Use a multimeter to check that the wire to the LED has no contact with ground (the body) with the ignition off
- 5If the fault returns, have a workshop replace the rain sensor button
Symptoms you may notice1
- The LED in the button does not light
General guidance for car owners. Diagnosis on the car can point to a different cause.