Hi,
Most definitely the wires for the Rear Seat Entertainment (DVD) system are NOT in the console assembly which has its own harness. There was a different harness for each of the console configurations (4 total in 2004). That is where most of the content occurs. The video cable between player and screen is separate and part of the player/screen assembly
If you have the Rear Seat Audio system (in 2004 it used plug-in headphones only) then the wiring in "main body harness" does contain the extra wires needed by DVD system.
The instrument panel harness would only contain wires required by DVD if you have either the DVD or XM radio option. Both of those systems are treated as an AUX audio input to the radio and required same wires (in that harness)
Those 3 harnesses in vehicle are only ones with content associated with DVD option.
Much more detail than you wanted but it is a complete answer
