VOLVO
CEM-B1D3511 - Hazard Switch. General Electrical Failures. Circuit short to ground
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 central electronic module (CEM) monitors the signal from the hazard warning switch. The code is set when the switch has been activated for too long, which may mean that it is stuck in the active position or is damaged. The check runs all the time, so the fault can be detected even when the hazard lights are not in use.
Possible causes
- The hazard warning switch is stuck in the active position
- Damaged switch
What you can do
- 1Read and clear the code, then switch the hazard lights on and off a few times and see whether the switch returns to off
- 2If you have a diagnostic tool, check in the live data that the hazard switch signal changes when you press it
- 3Check that the connectors at the switch are fully seated and not corroded
- 4Have a workshop replace the switch if it stays stuck in the active position
Symptoms you may notice1
- The hazard warning lights do not work
General guidance for car owners. Diagnosis on the car can point to a different cause.