Sometimes after I park the car in the garage the alarm horn will emit a low
sound like the alarm is going off even though the car is not locked.
It's noticeable only because the garage is a relatively quiet place. The
sound level is 1% of the normal alarm level. Loud enough to hear in the
house/garage, but not loud enough to hear when the car is parked outside in
If I lock the car, the sound stops and it starts again after I unlock the
It occurs mostly when the car and the garage are warm say 80 degrees F or
I've scanned using VAG-COM which turns up nothing.
By morning, the sound has stopped. It doesn't run the battery down.
The alarm does work at full volume when activated (i.e. 'unlock door with
alarm on' or 'dog barking in car with alarm on' or hit 'panic button').