Volvo security systems will cut off power to the starter motor if triggered. Sounds more like you have a bad crankshaft sensor or camshaft sensor. They are what triggers the ECU to turn the coils on and off. Alarm is NOT your problem.
SOURCE: it will start but it shuts off 2 seconds later
it could be the alarm but it also can be your battery. i dont no much but same thing happen to mine
is there anyway you can put power to it (B+) 12vlts. That the only way you will know if its the siren
SOURCE: Alarm siren and sunroof not working. Replacing alarm siren did not fix it.
Whenever
this warning light or any other stays on in the dash it is indicating
that the systems control module (or the system sensor in the case of
lights like low oil pressure, door open indicators etc.) has detected
a fault, it then disables the system (this applies to ABS,TCS, TCM,
SRS and BCM faults and others) as long as the light is on. You must
now have the dealer hook up a special electronic diagnostic tool and
"scan" the system for the fault code that is stored for the
problem(s) Legend
of Abbreviations. ABS Antilock brake system.TCS Traction control
system, TCM Transmission control module, SRS Supplemental restraint
system, BCM Body control module
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