VOLVO
CEM-B110C87 - Rear door driver side power child locking motor. Bus Signal / Message Failures. Missing message
System
Central Electronic Module (CEM)
Volvo models this fault code applies to
Applies to the following models:
2 modelsV40 (2013–), V40 Cross Country (2013–)
Show models by year and engine (2)
What does this fault code mean?
The child lock on the driver side rear door sends no message to the CEM, so the control module receives no information from the function. The child lock then does not work, and a yellow warning symbol with a text message may appear in the display.
Possible causes
- Damaged switch that shows the lock motor position
- The lock motor is stuck
What you can do
- 1If you have a diagnostic tool: read the fault codes in the driver and passenger door modules (DDM and PDM)
- 2Turn on the child lock with the switch on the driver's door control panel and check that the rear door then cannot be opened from inside
- 3Check that the fuse for the left rear door module is intact. Use a multimeter to check that the wire is not shorted to ground before replacing the fuse
- 4Look for chafing and pinch damage in the wiring to the rear door and check that the connectors are secure
- 5If the fault returns, have a workshop with diagnostic equipment check the bus and the control modules
Symptoms you may notice2
- Child lock in the rear door does not work
- Yellow warning symbol and text message in the display
General guidance for car owners. Diagnosis on the car can point to a different cause.