I tow a 2006 Odyssey four down. I installed a 12v hot wire from the RV to the Odyssey using one of the terminals in the tow wiring harness. Works great and don't have to pull any fuses or reset radio, etc.
Sorry, I didn't think about you not having a wiring cable to your Odyssey so disreguard my comments.
Don & Carolyn Bingham
2003 Allegro Bus Freightliner 40DP ISL400
Honda Odyssey, Blue Ox