hi i have added a genuine audi rns-e sat nav to my 07 reg cab and erm the left hand side of the multi function steering wheelb doesnt work with the unit i cannot change songs or mode on the unit, also when i press the telephone button it says telephone not availible but when some one ring my phone it comes up on the rnse units screen and i can answer the call using the rnse unit, i have channged 1 wire round on the leads do i need to change n e more???