I recently found out that on the Armada Bose system that the factory DVD harness can be found just in front of the gear shift. You can't see it but can feel it and unclip it to bring it into view. There is acc power, audio left and right and a FES Enable and Audio on plus the video wires. If you are looking for an additional audio input you can use this. You will still need an inline amp as the volume is low. To activate you can use the rear av swith holding it down for 1.5 seconds. Oh and connect the FES and Audio on wires together. Doing this tricks the HU into thinking the factory DVD is there and on. This will also allow you to select the DVD on the rear controls...still can't select the AUX though.
