Hu850 wiring diagram

[Bump80]

Hi just wondering if someone can help 

I have a S60 with an hu850 headunit fitted it's been playing up for a while so I brought a new headunit but I'm having trouble finding I wiring diagram for the original loom I brought a patch harness but it only has 4 wires were the original loom has 7/8 . The spare ones I presume are for steering wheel controls would anyone have a link to diagram that can help me out 

 Thanks in advance   bump

[BlackT5]

https://qclt.com/html/volvo_ewd_us_eng/3976202/index_3976202.html