VOLVO
CEM-8F30 - Relay, headlamp wash / wipe. Faulty signal
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 modelsC30 (2007–2013), C30 Electric (2011–2013), C70 (2006–2013), S40 (2004–2013), V50 (2004–2013)
What does this fault code mean?
The CEM monitors the headlamp washer motor and has registered too low a signal, or no signal at all, on the driver circuit for the relay. The headlamp washing then does not work, because the relay does not get the right control.
Possible causes
- Short to ground
- Open circuit in the cable
What you can do
- 1With the ignition on, activate the headlamp washer and listen for the relay click: no activation means a permanent fault, activation means an earlier fault
- 2Check that the headlamp washer relay is correctly installed in its socket
- 3Look for chafing and a short to ground in the cable to the relay, especially where it runs close to the body
- 4With the ignition off, use a multimeter to check that the cable to the relay has no open circuit
- 5If the fault returns, have a workshop check the cable and replace the relay if needed
Symptoms you may notice1
- The headlamp washer motor does not work
General guidance for car owners. Diagnosis on the car can point to a different cause.