Volvo Hands Free Accessory wiring diagram 2007 XC70

[235tonyw]

Hi does anyone have a wiring diagram with colour codes for the genuine Volvo Hands Free kit dealer fitted in the 2000's? The blue box is a Motorola item and there is just one white plug that the harness (code 3042260Z02) plugs into, the other end plugs into the Blue box code 31285052 which has failed.
I believe but not sure as difficult to see that the white connector maybe wired into the din plug that uses the HU850 auxiliary din port as both of my ports have plugs in with one going to the underseat amp?

I'm trying to fit a new Parrot 3100 HF kit via a SOT harness which works only with the dash centre speaker - anyone have a suggestion or solution please?
235tonyw