VOLVO
CEM-8F29 - Relay, front screen washer motor. 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 fault is intermittent: the CEM registered that the relay for the front windscreen washer motor was short-circuited to voltage on an earlier occasion, but it is no longer present. The front washing may then fail.
Possible causes
- Short to voltage on the signal line
What you can do
- 1Clear the code and check whether it returns; an intermittent fault can be a temporary disturbance
- 2Check that the relay for the front washer motor sits properly and that its contacts are clean and free of oxidation
- 3Check the connector for play and for signs that the wire briefly touches voltage
- 4Look for chafing on the wire between the relay and the CEM where it may have touched voltage
- 5If the fault returns, have a workshop check the relay and the wiring
Symptoms you may notice1
- Front windscreen washing does not work
General guidance for car owners. Diagnosis on the car can point to a different cause.