Toyota Camry 2010 has resistive steering wheel remote controls.
It can be connected directly to CarPC JoyCon EX.

Connect W wire and G wire to CarPC JoyCon’s DATA(white).
Connect B wire to CarPC JoyCon’s GND(black).

If you use CarPC JoyCon EX, you don’t need a resistor to avoid duplication.
7(SW1) -> DATA of CarPC JoyCon EX channel A
8(SW2) -> DATA of CarPC JoyCon EX channel B
6(SWG) -> GND of CarPC JoyCon EX