HOW TO SET STEERING WHEEL CONTROL ON JOYING HEAD UNIT?

Could you find your factory steering wheel wire?

If don't know which one is your origianl steering wheel control, pls check this video about how to find out the steering wheel wire by Multimeter (usually the voltage is 5V):

 https://youtu.be/BBCTfdr3dEk

After finding out the Steering wheel wire:

If there are 2 steering wheel wires, then pls connect it to our key1 and key2 wire, GND wire must be connected like below picture shows.

If there are only 1 steering wheel wire in your car, then pls connect it to Key1 or key 2, GND wire must be connected.

Then pls check this video to learn and set the steering wheel button: https://www.youtube.com/watch?v=jjrcGuB0D5s(Android 4.4.4)

        https://www.youtube.com/watch?v=xCPdAMy2aF4 (Android 5.1.1)