1999 BMW 318 ti "telephone mute wire" Questions

...telephone mute wire on the radio harness. The mute function works when the mute wire is sent to ground so it could be that the cable insulation has rubbed off and now touching a ground (cars body

...mode only the 2 in the back doors work. yes all wires are connected, yes balance and fade are good. its not on telephone mute. im out of idea.... could be faulty cd player loose or broken wire in ...

...telephone mute wire touch the body of stereo player aftre that it stopped working and the clock is also not displaying the time, i thought it may the fuse is gone but when i checked all fuse are fine ...