S3 Alarm.....yes you know the story

thegoal007

Another S3 owner....
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usual thing, for a long time there was the usual few bleeps making me aware I've got problems with the siren. Then in due time no bleeps.... no alarm siren so i thought the dreaded battery corrosion issue. This was months and months ago.

Recently, I ran some VAG tests (full license Lite version) via the output tests from one of the control modules section. One of the checks as I pressed the enter button was to set the alarm siren on....and it sounded until i moved to the next test when it went off.
So basically going through the test the siren DOES work. Can anyone explain this because my brain can not compute this situation!
 
Because the batteries are backups for when the power is cut... otherwise its powered from the main car battery supply

<tuffty/>
 

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