2004 Volvo XC90 Car alarm started alarming. Does not appear that anyone tampered with the car or tried breaking in. All I had to do was use the key and hit the lock and then unlock buttons.
This has never happened before. There was no wind or thunder. I have had car alarms be triggered by thunder before.
Any ideas why this happened?
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The main alarm system box is located in the right front fender. To access it you have to remove (drill out) the rivets holding the plastic wheel well cover in place under the fender. It is common for the battery in the alarm to die (and subsequently leak) rendering the alarm inoperative. For that reason it is probably not a good idea to buy a used alarm of the same age. Note, you should be able to buy the replacement rivets in a kit from Volvo.
The person(s) who serviced your alarm should be able to tell you if you have siren or horn type.. We have NO idea what alarm system you have..Volvo has many alarm systems.
Ti reset you service light you need an OBII scanner - You can have any good shop or auto parts store do it for you.
It means that the vehicle diagnostic system has detected a faulty alarm component and must be diagnosed and fixed.
At best it just means that your alarm is partially or wholly non-functional, at worst it could activate at random or even cause the immobiliser to play up.
Unless you have specialist skills and tools then it's not really a DIY fix unless the fault is a really obvious one, like a failed door switch.
the xc90 has fiber optic cable all date is sent trough and it make a loop from the dash cluster to the radio to the ecu. i would ask for a wire diagram and start with some wire. i had a pinched wire under the dash with the same issue.
The Alarm on my Mercedes ML320 sounded every night, then it started doing it more often, Showed it to the dealer he says it's the 'Tow Sensor', that needs to be repaced. $700, down the drain. I have already started hating this car, it eats $500-600, every 6 months...
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