I have an A4/2.8/Quattro/1999 and have programmed my central locking system/alarm with code 16200 and then 16232. After a while, I encountered the following 2 symptoms:

1. Alarm goes on/off for no reason every 10 mins after I lock the car
2. Horn + Lights stopped sounding when arming

All other features work well, including flashing lights when disarming...any clues as to how I can:

• correct issue 1 + 2 above
• disable internal monitoring sensor - In the meantime I found a button in between the front & rear door on driver's side that apparently disables the motion sensor alarm

Thx

 

The interior motion sensor is exactly what triggered it, the horn and lights will go off for about a minute and then the lights will continue to flash for a couple more minutes. As far as I know the only thing to stop it is the button which you found in between the doors