MY18 Touareg R-Line V8, White
Mate, I would take it back to the shop where you got it installed. Could be something really simple like a fuse or connector. Maybe something with the install that has gone wrong. If your nice to them they may even fix it for free. Wouldn't take them more than 10 minutes to check it over. I bought mine locally from the distributer and they supplied 12 month full warranty. Cost more up front but worth it in the long run.