This is the steering wheel of Alfa Romeo 156 2.0 JTS.
The headunit has 4 wires
1. RC-A2. RC-B3. GND4. TEL/MUTE
Each button has resistance value like this.RC-A:Mute 390Vol Up 170Vol Down 70
RC-B:SRC 391Forward 171Backward 71
Because left and right buttons have same value,
one resistor is needed to avoid duplication.Put a 5k~10k ohm resistor between RC-A and RC-B.
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