Nissan Navara 2007 has resistive steering wheel remote controls.
It can be connected directly to CarPC JoyCon EX.

If resistance value of L(15) and W(14) is duplicated, one resistor(for example 6.8k) is required to avoid duplication.

If you use CarPC JoyCon EX, you don’t need a resistor to avoid duplication.

15(L) -> DATA of CarPC JoyCon EX channel A

14(W) -> DATA of CarPC JoyCon EX channel B
16(BR)-> GND of CarPC JoyCon EX