Alarm keeps going off

[tom549]

Hi all.

So i lock the van(press once) and about 30 seconds later alarm goes off.

I've checked for insects etc and can't find any reason why it'd be going off. I've tried covering the sensor up and still plays up.

Carista shows I have a 'backup battery:flat' fault. I'm curious to whether this could be an alarm backup battery? B1916F2 , but pretty sure this is related to the sos system.

If i double click the lock button it's fine.

Cheers

Tom

 

[Bargy62]

@tom549 if you have the switch on the B pillar by the drivers seat press that turns red to orange and single click the fob to lock and see what happens this disables the motion sensors

 

[mmi]

can't find any reason why it'd be going off.

How about checking anti-theft system history data for alarm triggering in the BCM - to narrow down the cause?
E.g.

Anti-theft warning system: history data-Cause for alarm activation

Hood contact

Unfortunately Carista probably can't do that. VCDS for sure, quite possibly also OBDeleven.

 

[Spaghetti]

Don’t know on the T6 but I’ve had it on an A4. The alarm siren on that has an NiMH battery in that will allow the siren to sound if the power is cut.

Eventually that comes to the end of its life. Audi recommend fitting a new siren as it’s sealed but I dremelled it open and soldered a new one in.

I knew it was faulty as it would make a noise from the siren when I locked the car. Not a full alarm sound but almost a beep to confirm it was locked.

 

[tom549]

Don’t know on the T6 but I’ve had it on an A4. The alarm siren on that has an NiMH battery in that will allow the siren to sound if the power is cut.

Eventually that comes to the end of its life. Audi recommend fitting a new siren as it’s sealed but I dremelled it open and soldered a new one in.

I knew it was faulty as it would make a noise from the siren when I locked the car. Not a full alarm sound but almost a beep to confirm it was locked.

Occasionally when I unlock and open the door I get a faint beep too. Sounds not to dissimilar. I guess the alarm battery's dead then

 

[tom549]

How about checking anti-theft system history data for alarm triggering in the BCM - to narrow down the cause?
E.g.

Anti-theft warning system: history data-Cause for alarm activation

Hood contact

Unfortunately Carista probably can't do that. VCDS for sure, quite possibly also OBDeleven.

I'll see if a friend can find anything on his obd11 and see what causing it ta