Reading off and erasing alarm causes
WARNING: This page is about a different car, the 2002 Volvo C70, 2001 Volvo C70, 2000 Volvo C70, 1999 Volvo C70, and 1998 Volvo C70. However, it is still accessible from the selected car via links, so may be relevant.
The control module can store up to 9 different alarm causes although only 5 alarm causes can be stored at the same time in the control module memory.
These alarm causes can be read off using VIDA PC via the VCT2000. NOTE: Alarm causes are erased at the same time as diagnostic trouble codes (DTCs).
Diagnostic trouble codes (DTCs) can only be erased when all diagnostic trouble codes (DTCs) have been read at least once. For each diagnostic trouble code (DTC), the frozen values for the following parameters can be read off:
The alarm causes that can be stored are
- door open
- opened tailgate or rear door
- hood open
- movement in the passenger compartment (detected by an ultrasonic sensor for S70/V70
and mass movement sensor for C70
)NOTE:
C70models have a mass movement sensor instead of an ultrasonic sensor.
- broken window (glass breakage sensor activated)
- car tilted (tilt sensor activated)
- resistive wire broken
- ignition on (if the car has been hot-wired for example)
- fault in the power supply (if the battery leads have been cut or there is an open-circuit in the power supply to the siren).