Rear VES wire harness splice?

Sure, you could do it. 3 wires for audio, 2 for CAN, 2 for power. You might even get lucky on this. Some of the 05's had a fully populated 10 pin connector (VES/Sirius) that actually went to a connector behind/above the drivers kick panel. You can actually unhook it there and pull it back to the center. I think some of the 05's had it put in as a planned connection for VES - before VES actually started shipping. When they started shipping, the actual connection was done in the center stack and went down the console, so the wiring to the kick panel was unused. It was discontinued in late '05 builds.

RADIO SIDE - 10 PIN
CAV CIRCUIT FUNCTION
1 X16 20DG/YL AUDIO SIGNAL RIGHT (+)
2 X917 20DG AUDIO SIGNAL COMMON
3 - -
4 X510 20DG/LB DVD AUDIO RIGHT (+)
5 X926 20GY/OR AUX AUDIO COMMON
6 X17 20DG/OR AUDIO SIGNAL LEFT (+)
7 X910 20GY/DG DVD AUDIO COMMON
8 X511 20GY/LG DVD AUDIO LEFT (+)
9 X521 20GY/LB AUX AUDIO LEFT (+)
10 X522 20GY/DB AUX AUDIO RIGHT (+)

Pins 1, 2 & 6 are Sirius SAT audio.
Pins 4, 7 & 8 are the DVD player audio.
Pins 5, 9 & 10 are the AUX plugs audio.

VES SIDE - 12 PIN
1 X510 20DG/LB DVD AUDIO RIGHT (+)
2 X926 20GY/OR AUX AUDIO COMMON
3 X521 20GY/LB AUX AUDIO LEFT (+)
4 - -
5 - -
6 A300 18GY/LG FUSED B(+) (I.O.D.)
7 X511 20GY/LG DVD AUDIO LEFT (+)
8 X910 20GY/DG DVD AUDIO COMMON
9 X522 20GY/DB AUX AUDIO RIGHT (+)
10 D55 20WT/OR CAN B BUS (+)
11 D54 20WT CAN B BUS (-)
12 Z909 18BK/LG GROUND

You need to pull CAN & Power from the 22 pin cable on the radio.

Hi there, on the VES, I see 10-pins, not 12:

Got it working! Pretty awesome!