No sound from cd autochanger
 

Hi everyone, I have an issue with the cd autochanger, basically no sound when playing cds. The sound works for the radio and navigation etc. I can select a different cd from the screen in the dash and hear the autochanger change the cds. I have changed the autochanger with the one in my dads x5 and it works fine, and his didn’t work in mine, so the problem is with the car, what leads should I have plugged in to the autochanger etc and where should they go? Thanks in advance Liam , ps it’s a 2003 4.6is with dsp