VOLVO
CEM-B104612 - Security Indication LED. General Electrical Failures. Circuit short to battery
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 alarm status LED in the instrument panel is controlled by the central electronic module (CEM). The fault shows that the wire to the LED is shorted to battery voltage, so the CEM cannot control the LED correctly and the alarm status is not shown. The fault is checked when the central lock is locked or unlocked.
Possible causes
- The supply wire to the alarm LED is shorted to battery voltage
What you can do
- 1Clear the code, then lock and unlock the car with the central lock to see whether the fault returns
- 2Check that the fuse for the alarm LED is intact
- 3Check that the connector to the alarm LED is fully engaged and not damaged, and that the cable is not pinched or chafed
- 4Use a multimeter (ignition off, connector unplugged) to check that the wire to the LED is not at battery voltage
- 5If the fault remains, have a workshop check the wiring and the LED
Symptoms you may notice2
- The alarm cannot be armed
- No visible alarm indication in the instrument panel
General guidance for car owners. Diagnosis on the car can point to a different cause.