Fiat GrandePunto has resistive steering wheel remote controls. It can be connected directly to CarPC JoyCon EX. DX_SIGNAL(left) and SX_SIGNAL(right) resistance value is duplicated, so a resistor is needed to avoid duplication. If you use CarPC JoyCon EX, you don't need a resistor to avoid duplication. SX_SIGNAL -> DATA of CarPC JoyCon EX channel