This web site is very helpful
https://www.newtis.info/tisv2/a/en/
You can see when the amplifier would be installed by clicking here
https://www.newtis.info/tisv2/a/en/f...nit/1VnYWEpyPn
You can have an explanation of the various Audi Systems here
https://www.newtis.info/tisv2/a/en/f...system/X0Ni0ZY
Hope it helps!