can anyone help me i have installed my RNS E into my A4 2003 previously i had nav plus DX cd version i ordered a wiring plug from Kufatec the navigation works fine shows in the instrument cluster but only if i turn the sat nav off and back on again but i can live with that. its my CD changer thats the problem when i connect the nav plus up i can here it loading the CDs and it lights up, but i cant choose any cds from the changer it is the glove box 6 disc changer and its the C revision, it worked fine with my old nav plus. the only thing i havnt done is code the car using VAG but i am not sure that i have too as everything else works fine it works the BOSE system perfect could it be that i havnt coded it using VAG or would the coding i had done on my old nav plus be ok. i have e mailed Kufatec but very difficult to understand what they mean in their e mails they keep saying "Please control the ground cable" could anyone HELP PLEASE !!!!!