Audi A6 C6 2.0tdi avant - remove alarm siren

[Moses009]

Hi, because I couldn’t find any pictures or accurate info, here’s where to find the alarm horn or siren. My car is a 2007 and I have a very annoying slow parasitic drain which I haven’t been able to solve. I am a competent mechanic and have done plenty testing as per loads of online guidance to trace it but no result. Anyway the alarm siren can be a problem for draining the battery sometimes, so cause the car is old and tatty I just removed it and disconnected it. The pictures show where it is located. Hard to get out but it’s do-able with the computer cover removed. One 10mm bolt holds it in beside the bonnet hinge and just have to forcefully wiggle and squeeze it out over the edge of the computer housing. Unplug the siren and tape over the plug. I tucked mine under the wing lip so it wouldn’t get water on it. 
- remove bulkhead plastic tray covering brake reservoir etc 
- remove two torx screws located in centre holding windscreen wiper motor plastic cover. Pull cover out of lip at bottom of window above the computer on passenger side only so you can bend it up to get hands under it.

- remove 5 torx screws holding computer cover. One is hidden on left side but you can feel it. Pull cover towards front and comes of easy. 
- remove 10mm bolt holding siren and remove. Circled red in photo.

[cliffcoggin]

How can you be sure there is a drain on the battery? Have you meaured it with an ammeter?