Thanks for this thread. I installed amazon $28 bed lights, tapped into the cargo light, and found that the cargo light didn't turn on when the tailgate is open. I can't believe this tailgate ajar is on my window sticker, but isn't activated in the BCM.
I did some research and came up with the cheapest option:
and AlfaOBD was $49 so the total cost was $90. It's worth it
1. I made the tailgate ajar indication work + cargo lights to turn on when tailgate is open
2. I made it so the fog lights don't turn off when the high beams are on.
I'm still looking for other cool mods that I can do.