I added an LED strip under the tailgate with tail/brake/turn/reverse lights. I ordered the truck with the 5th wheel wiring prep so wired the strip directly to the 5th wheel wiring, where the 7 pin plug would go. It popped up as a "Trailer Connected" on the DIC so I chose "Accessory Only" on the trailering app. Then no issues.
Since my Covid-build truck delivered without a few things, I didn't have rear parking sensors for a while. After the dealer installed the rear sensors, the DIC says "Rear parking sensors disabled" (or similar, its not in front of me) whenever I go into reverse.
I have taken it in to the dealer twice, and they can only tell me the truck thinks there is a trailer connected so defeats the sensors, though it is set to accessory only and does not show a trailer on the app. I keep insisting that this is why there is an "Accessory Only" item on the menu and it should work as such. Seems to me a software issue. When they unplug the 5th wheel harness the sensors work fine so they refuse to do anything further.
The only way I can see to remedy at this point is to tap into the taillight wires, which is a PITA vs where I wired it originally.
Anybody else run into this or have any ideas?
Thanks!