VOLVO
CEM-6C34 - Switch reduced alarm. Activated too long
System
Central Electronic Module (CEM)
Volvo models this fault code applies to
Applies to the following models:
5 modelsC30 (2007–2013), C30 Electric (2011–2013), C70 (2006–2013), S40 (2004–2013), V50 (2004–2013)
What does this fault code mean?
The reduced alarm switch is used to temporarily disconnect some sensors in the alarm, and it is wired directly to the CEM. The fault code is set when the switch has been active for longer than normal, which means it has stuck or the button has been held down too long.
Possible causes
- The reduced alarm switch has jammed in the activated position
- The button has been held down for too long
What you can do
- 1Press the reduced alarm button once and check that it returns when released
- 2Check that a message is shown in the instrument panel when the function is activated and that the indicator lamp on the switch lights
- 3Clear the fault code and road test the car to see whether it returns
- 4Check the wires to the switch for chafing and loose connections
- 5If the wires are intact but the button still sticks, the switch should be replaced
Symptoms you may notice1
- Temporary disconnection of the sensors does not work
General guidance for car owners. Diagnosis on the car can point to a different cause.