How to make the steering wheel control work correctly?

1. If you buy a universal player, you need to connect the KEY1 and KEY2 wires to the steering wheel control wires from your car. And then you need to study the steering wheel control following the steps: settings-general-steering wheel study. 
You need to long press the button on your car steering wheel, and then the red tips we circle will change to orange color, then you click the function you want to set. After all, you click the tick and it will save.

2. If you buy a plug and player for your car without CANBUS decoder, then you also need to study the steering wheel control following the steps: settings-general-steering wheel study. Some plug and play player also need to connect the KEY1 and KEY2 to the steering wheel control wires from your car, it is normal.
You need to long press the button on your car steering wheel, and then the red tips we circle will change to orange color, then you click the function you want to set. After all, you click the tick and it will save.

3. If you buy a plug and play player for your car with CANBUS decoder, you must connect the CANBUS decoder to our power cable set. And connect the 8pin plug from CANBUS decoder to our player, see the below picture we arrow with.

And also you need to set the correct car model following the steps: settings-factory-8888 ok-car model-select your CANBUS and car model，after all, the steering wheel will work correctly.
After settings, if some key does not work correctly, you can also set the steering wheel control in another way, following steps: CARAPP-SWS study-then follow the instruction on the page.