can anyone answer my question i have a 1998 3 series bmw s reg it has a original rds cassette deck installed but also says that it has been preprepaired to take a multi disc player my question is does this mean that the wiring is already installed and that all i have to do is plug the player in or is it more complicated than this if wiring is installed how do i find it have looked in the boot but could not find any obvious wiring and no sign of a connector please could anyone help thanx