Got the switch, mapped it out, 2 pins are LED backlight power and ground and they have their own limiting resistors, and a single reverse polarity protection diode. Other 3 are controls, the power in, the BCM signal, and the other goes to the traction control button on the left side switch according to the diagram, but then that goes to the BCM as well. Resistors all are within a few ohms of the ones listed on the diagram. The board is a 2 layer board, surface mount resistors, and the buttons are the cheap one built right onto the board with rubber dome switches on top with a conductive pad attached to bridge the contacts, so could down the line make a custom board, same shape, those button pads (and LEDs probably) in the same places, and just design a circuit with the truck controls in mind. Pads look like they are gold plated but board houses should be able to do that. Will take a look after dinner, but I can probably change the resistors on the board to ones for the truck and have some, maybe even full functionality for the buttons this switch has, so that will be the next thing is desolder the board and solder in other resistors. The way this factory board is setup, the next and previous arrows buttons I think will have to be backward for the test, which is why a custom board will be the final/cleaniest solution.