First of, recently bought an audi a3 as a run around, no modding as I have this to play with. Anyways, my audi a3 came with an rsn-e which I took out as I never used it and bought a standard double din audi chorus. Checked the fuse in the back of the radio, and its fine, put the sat nav back in to check I hadn't blown any other fuse, and that worked fine so once again on putting the chorus in, nothing its dead. Firstly is the quadlock the same for my old sat nav as it would be for the radio. If so, any suggestions? There power, no fuses but nothing comes up on the chorus.