VOLVO
CEM-B1A7901 - Rear Fog Lamp Circuit. General Failure Information. General electrical failure
System
Zentralelektronik (CEM)
Volvo-Modelle, für die dieser Fehlercode gilt
Gilt für folgende Modelle:
4 ModelleS80 (2007–), V70 (2008–), XC60 (2009–), XC70 (2008–)
Modelle nach Baujahr und Motor anzeigen (4)
Was bedeutet der Fehlercode?
The CEM supplies the rear fog lamps directly from an output. The fault is stored when the supply wire has a break or is short-circuited to earth, and then the rear fog lamps do not work.
Mögliche Ursachen
- The supply wire is short-circuited to earth
- Open circuit in the supply wire
Was Sie tun können
- 1Check that the fuses for the fog lamps are intact
- 2Switch on the fog lamps and see whether the rear lamps light, then clear the fault code and road test
- 3Check the supply wire to the rear fog lamps for breaks, chafing and pinch damage
- 4Use a multimeter to check that the supply wire is continuous between the connector ends and has no contact with earth
- 5If the fault returns, have a workshop with diagnostic equipment fault-trace the control module and the wiring
Symptome, die Sie bemerken können2
- The rear fog lamps do not work
- A message appears in the display
Was der Fehler beeinflussen kann3
- The output switches off during the driving cycle in which the fault is detected
- If the fault remains, the output is switched off permanently after 100 driving cycles where the fault was detected
- Erasing the fault codes and starting a new driving cycle resets the output
Allgemeine Hinweise für Fahrzeughalter. Die Diagnose am Fahrzeug kann eine andere Ursache zeigen.