VOLVO
CEM-4F48 - Seat belt buckle, rear left-hand. Signal too low
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 left rear belt buckle. If the voltage is too low or the signal wire has a break, the code is set. The information lamp may light and a message may appear in the display.
Possible causes
- A short to ground in the signal wire between the rear left buckle and the CEM
- A short to ground in the connector
- An open circuit in the signal wire inside the buckle
- An open circuit in the signal wire between the buckle and the CEM
- Cross-connected signal wires between the buckle and the CEM
- A damaged fuse
What you can do
- 1Check the fuse for the seat belt function in the passenger compartment. If it has blown, replace it once
- 2Safety: the seat belt system is part of the crash protection. Do not work on the wiring or the buckle yourself. Have a workshop check the wires
- 3Look for chafed or pinched cables at the rear left seat belt, without removing anything
- 4After the work, clear the code and check that the information lamp goes out
Symptoms you may notice2
- The information lamp is lit
- A message appears in the display
General guidance for car owners. Diagnosis on the car can point to a different cause.