Re: Audi A3 alarm keeps going off randomly - 05-06-2020, 10:34 AM. I'd start with the boot and check for water ingress. My A3 (2006 Sportback) had water coming in past a failed third brake light seal, ending up in the boot lock and causing the car to think the boot was opening, so setting the alarm off. When the alarm goes off, check whether.. The Audi A4 is a luxury small car that started out as a 1996 model year in the US. Like many other vehicles, it is susceptible to issues related to the alarm system. If your A4's alarm keeps going off, […]

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Hi all. I've seen my alarm going off for no apparent reason a couple of times before now (I've had the car 10 months). Yesterday I parked up in a shop car park, purposely well away from any other traffic / cars / footpaths etc and went into the shop. I'd realised I'd forgotten my glasses and had to come back to the car - the alarm was.. Alarm siren going off! So the only way to stop it was to disconnect the siren again. Just to add that may help diagnosis. The red led on drivers door top panel which indicates the car is alarmed. This stays on constant for 30 seconds before flashing every second when you lock the car.