VOLVO
CEM-4F92 - Seat belt reminder. Signal missing
System
Central Electronic Module (CEM)
Volvo models this fault code applies to
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 central electronic module (CEM) receives no signal from the seat belt reminder sensor in the passenger seat. The sensor detects whether someone is sitting in the seat so the car can warn when the belt is not fastened.
Possible causes
- Open circuit in the wire between the sensor and the central electronic module
- Loose or corroded connector under the passenger seat
- Damaged seat belt reminder sensor
What you can do
- 1Check the connectors under the passenger seat – they can easily come loose if the seat has been removed or moved a long way
- 2Check that no wiring under the seat is pinched or broken
- 3Clear the code and see whether it returns
- 4If the fault remains, have the sensor and wiring checked by a workshop
Symptoms you may notice2
- General warning lamp on
- The passenger seat belt reminder may not work correctly
General guidance for car owners. Diagnosis on the car can point to a different cause.