VOLVO
CEM-8F25 - Relay, windshield wiper. Signal too low. 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 fault is intermittent: the wiper relay registered a signal that was too low on an earlier occasion, but it is no longer present. The cause may be a defective relay, a relay that is not seated properly, a break in the wire, or a wire shorted to ground.
Possible causes
- Defective relay, such as a damaged coil
- Relay not seated properly in its socket
- Break in the wire
- Wire shorted to ground
What you can do
- 1Clear the code and check whether it returns; an intermittent fault can be a temporary disturbance
- 2Check that the wiper relay is properly fitted in its socket
- 3Carefully remove the relay and check that the socket contacts are clean and free of oxidation
- 4Use a multimeter to check that the wire to the relay has no break and no contact with ground (the body)
- 5If the fault returns, have a workshop replace the wiper relay if it is defective
Symptoms you may notice1
- The windscreen wiper motor does not work
General guidance for car owners. Diagnosis on the car can point to a different cause.