This is actually for steering wheel mounted auto trans shifter buttons.

When checking with a multimeter, the "Up" button on the steering wheel gives me a resistance of 0.3 ohms, while the "Down" button gives me a resistance of 2.0 ohms. But if I wire the Joycon EXR to those exact same wires that I'm testing, both buttons give the same result in Joycon Explorer, the red indicator leaps to the far left for either button.

What am I doing wrong?