VOLVO
CEM-B1D3912 - Rear Wiper Motor Connection Circuit. General Electrical Failures. Circuit short to battery
System
Central Electronic Module (CEM)
Volvo models this fault code applies to
Applies to the following models:
6 modelsS60 (2011–), V60 (2011–), V60 Cross Country (2015–), V70 (2008–), XC60 (2009–), XC70 (2008–)
What does this fault code mean?
The central electronic module (CEM) supplies and controls the rear wiper. The code is set when the signal from the wiper is too high, which is caused by the signal cable being shorted to voltage.
Possible causes
- The signal cable to the rear wiper is shorted to voltage
What you can do
- 1Read and clear the code, then activate the rear wiper and see whether it works
- 2Check the rear wiper fuse
- 3Use a multimeter to see whether the signal cable has voltage with the ignition off
- 4Look for chafing and damaged insulation on the cable to the rear wiper
- 5If the wire is intact, have a workshop with diagnostic equipment check the module output
Symptoms you may notice1
- The rear wiper does not work
What the fault can affect3
- The function switches off during the driving cycle in which the fault is detected
- After repeated driving cycles with the fault, the function is switched off permanently
- Clearing the fault codes and starting a new driving cycle resets the output
General guidance for car owners. Diagnosis on the car can point to a different cause.