Thanks for all the info everyone, I hooked this up today and it works perfect.
I did hook it up similar to cansubie
after reviewing the schematic. The differential inputs should be hooked up a certain way to eliminate the alternator whine due to ground loops. This is how I hooked it up:
6 Right channel signal
7 Left channel signal
13 Connect to ground (on pin 12)
15 Right channel shield
16 Left channel shield
My pin 14 was high impedance. The model number is CQ-EF8560X. The schematic posted shows nothing on this pin so that makes sense.
The shields of the coax cable should only be tied on the end where the aux jack is. The other end of the coax shield should be connected to pins 15 or 16 and not tied together; although you can tie these here, it's not as ideal.
I stole some pins off an old Subaru harness I have. They weren't exactly the same but they locked into the connector shell and fit the pins just fine. It's not the same as the old 14 pin connector, the pins are about half the size.
I mounted an 1/8" female jack in the center console between the two 12V lighter outlets. The center blanking plate pops out and it's easy to drill a hole and put a panel mount jack there. This is the jack I used: