CD changer not recognised

Guest
just bought my 3rd audi ,a 98 a6
had a sony single cd fitted but i prefer to keep things original so have refitted concert and changer (fortunetly also came with a6)
HU works fine but does not resognise the changer. The changer is getting power when i plug in din lead as it checks the discs.
Any ideas what problem is or how to test lead appreciated!!
 
Does it not recognise that it is there at all, or just refuse to play any of the discs?
 

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