Hi guys quick question. I have the RNS 315 sat nav Head unit, and Im about to fit an amp and interface. This will involve dissconnecting the battery. Will I need to do anything on re-connection? In the olden days you needed your radio code, but today I think the head unit is married to the car via vagcom. So can you just plug it back in and it will reconise the car and work straight away. Cheers guys.