I have been getting alarm codes (check your interior) my 05 XC90 for no apparent reason.
I lock the door with the fob, I see the "ready" light on and when I return to the vehicle several hours later the "ready" light is rapidly flashing. It has been happening quite frequently. I did not hear about neighbor/police complaints about an alarm going off at various hours so I would thing I am not getting an audio. Perhaps the siren doesn't work? I have no idea.
Any assistance would be greatly appreciated.