panasonic 16 pin, need wiring harness dia

If it's a head unit made within the last 3 or 4 years the colors will definitely just match up to the colors of the wiring harness you got for your vehicle.  This is the standard that all aftermarket manufacturers follow:

https://www.the12volt.com/request/request2.asp

blue wire goes to the power antenna wire, yellow goes to +12v constant, and black goes to ground.  Not sure why there's two black wires but you should probably hook up both of them to ground.  Do they look like they both come from the same spot on the harnes?  Or are they totally separate wires?

What about a red wire?  wasn't there one of those?  There should definitely be some kind of wire which tells the head unit only to turn on when the key is in the accessory or ON position.  Usually this is a red wire but the coloring might be a bit different.

Here's the manual online, you should be able to figure it out from here as a last resort.

http://www.pasc.panasonic.com/OperatingManuals/CQDP965EUC.PDF