VOLVO
CEM-6C3A - Glass break wire. Signal too high
System
Central Electronic Module (CEM)
Volvo models this fault code applies to
Applies to the following models:
2 modelsC30 (2007–2013), C30 Electric (2011–2013)
Show models by year and engine (2)
What does this fault code mean?
The CEM checks the glass breakage loop by measuring its voltage whenever the alarm is switched on. The loop should normally be connected to ground. The fault code is set when the voltage is not ground, which means the loop has a break.
Possible causes
- Open circuit in the glass breakage loop
- Cable short to voltage supply
What you can do
- 1Clear the code and activate the alarm to see whether the fault code returns
- 2Use a multimeter to check that the wire has no break and no contact with voltage
- 3Check the intermediate connectors for loose connections and corrosion
- 4Disconnect the connector at the tailgate and check the glass breakage loop for a break
- 5Remedy what is found and check that the alarm works again
Symptoms you may notice4
- Alarm does not respond to the sensor
- Message in the display
- Alarm or other alarm problems
- Warning symbol and text message
General guidance for car owners. Diagnosis on the car can point to a different cause.