Ersin Stereo Wheel Button
I have an Ersin unit with GND, SW1 and SW2 , connecting GND to ground didn't work. After tips from bigdaddystew here, I connected GND wire to SW1 then wheel button worked.
My wiring explained:
From Ersin radio Car stereo plug "BMW "
GND & SW1 > blue/orange
SW2 > blue/purple
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