VOLVO
CEM-B1C5513 - Horn Relay. General Electrical Failures. Circuit open
System
Central Electronic Module (CEM)
Volvo models this fault code applies to
Applies to the following models:
7 modelsS60 (2011–), S80 (2007–), V60 (2011–), V60 Cross Country (2015–), V70 (2008–), XC60 (2009–), XC70 (2008–)
What does this fault code mean?
The fault is stored when the signal to the horn relay is too high while the horn is not activated. The fault concerns an open circuit or poor contact in the connections.
Possible causes
- Contact resistance, oxidation or poor contact in the connections
- Open circuit in the relay drive circuit
What you can do
- 1Check that the fuse for the horn is intact
- 2Press the horn to see whether it works, then clear the fault code and road test
- 3Check the connectors at the horn relay and at the CEM, and clean or press in any that are loose
- 4Use a multimeter to check that the wire to the relay is continuous between the connector ends
- 5If the fault returns, have a workshop with diagnostic equipment fault-trace the CEM, the relay and the wiring
Symptoms you may notice1
- The horn does not work
What the fault can affect2
- The function switches off permanently after 100 driving cycles where the fault was detected
- Erasing the fault codes resets the output
General guidance for car owners. Diagnosis on the car can point to a different cause.