VOLVO
CEM-B112B87 - Steering wheel module. Bus Signal / Message Failures. Missing message
System
Central Electronic Module (CEM)
Volvo models this fault code applies to
Applies to the following models:
9 modelsS60 (2011–), S80 (2007–), V40 (2013–), V40 Cross Country (2013–), V60 (2011–), V60 Cross Country (2015–), V70 (2008–), XC60 (2009–), XC70 (2008–)
What does this fault code mean?
The CEM both sends and receives information over the LIN bus, a standardised serial communication method. The code is stored when communication with the steering wheel module (SWM) is lost for a set time. The turn signals, wipers and washer then do not work, and the trip computer may show faults.
Possible causes
- Open circuit on the power feed to the steering wheel module (SWM)
- Break in the ground lead to the steering wheel module (SWM)
- Contact resistance in the connections
- Break or short circuit on the LIN bus to the steering wheel module (SWM)
- Damaged steering wheel module (SWM)
- Internal fault in another unit on the same part of the LIN network
What you can do
- 1If you have a diagnostic tool: check whether the CEM has other fault codes ending in 86 or 88 and deal with those first, since they point to the LIN bus
- 2Check that the relevant fuses are intact. Their locations are in the owner's manual or on the fuse box cover
- 3Check that the connectors in the steering wheel and the connections to the steering wheel module are secure and not oxidised
- 4If you have a diagnostic tool: read the steering wheel module status in live data and check that it responds
- 5If the fault returns, have a workshop with diagnostic equipment check the LIN bus, the power supply and the steering wheel module
Symptoms you may notice5
- Rear turn signal does not work
- Windshield washer does not work
- Trip computer has other problems
- Front turn signal does not work
- Windshield wiper does not work
General guidance for car owners. Diagnosis on the car can point to a different cause.