wire harness help please !!

[05denali702]

so my oem nav unit (15800001) was stolen they ripped or cut wires, so i bought another unit and when i talked to chevy to buy harness they said they do not come with wire leads so does anyone know how i can tell which wire goes to what when i buy the plugs?? any help much appreciated, here is a pic of what i am looking at...

 

[Capt_Caveman]

This should get you started. The link HERE has the pinouts and you can download the TRN 800 install instructions from This Link. The install file shows the connector pin positions.

You might want to head to the junk yard and see if you can get the missing connectors from a wreck with part of the harness as leads. It might make matching the wires a bit easier.