As stated earlier if you disconnected the airbag in the top vent then this is the reason why you have the airbag out.
simple reset with VCDS, just make sure you have plugged the connetor back in properly and it clicked back into place.
iirc pre 2007 mk5 models suffer from batter drain.
1 - if your running older FW on the RNS, do not update until you can get a newer CANBUS (if your car is pre 2007 or you will suffer.
2 - if you get any issues get a newer CANBUS. I can sort that out if you like. send me a PM