My alarm keeps going off on my audi a3 1.9tdi 55 plate, it doesnt sound like the normal alarms which come off the horn its more high pitched,i have tryed double locking the car but its still goes off when its not locked its ok

try making sure the heater air grills are closed as air movement ie windy night ,could set of some alarms , i'd also check for voltage drop as this will set alarm off , also check battery holds the charge as may disperse just enough to set alarm off but not so much to be a problem when starting , YET .

For starters first check the wire going to the horn, it may be cut.

try disconnecting the battery and reconnecting

power sounder battery has a fault, first sign its faulty is randomly going off, were the sounder is you need to remove it, and replace it, or you can try to replace the battery inside, you can remove it and alarm will revert to a horn on some models that have a horn fitted but the wiring is in there for a horn to be fitted.

Is this a factory alarm or a add on weekend boy racer type thingy ,if the later cut it out the system as they always go wrong when they get old

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You probably have a faulty door,boot or bonnet lock.If you put the inside light switch to the setting for the light to come on when the doors are open,close all the doors and see if the light goes off.If your model golf has a display on the dash,it shuold tell you which door is open.It could also be a faulty interior sensor or a faulty alarm horn.A diagnostic machine will be able to tell you which was the last alarm activation.

There is a few things to do check the door switches that control dome lights, check wire down by the skid plate when you get oil changed there is a sensor for the starter there if it is stolen the alarm will go off or just take a BAT and BEAT the living **** out of your horn and call it good like I am going to. I hope this helped or will help I recommend an aluminum bat vrs. wood

this sounds like a faulty 'boot' switch. Many of the older models had issues with picky switches

i had the same problem with my 2001 audi a6 and just foung that if i left the windows cracked at all it would do it so make sure all your windows and sunroof are all the way closed see if that works if not then take it in to the dealer ship sounds like you might have quite an electrical problem.