The specific operation steps are as follows:

1. The USB mode of Buick New Regal is equipped with a switch button. If it is not in the special button closest to the driver's seat on the button panel, you first need to find a USB interface in the central armrest box of Buick New Regal. It should be noted that you can also find interfaces in other locations, as shown in the following figure.

2. After that, you can insert the U disk into the USB interface of Buick, and remember the songs that need to be stored in the U disk, as shown in the following figure;

3. Now start the Buick Regal vehicle and press the aux button on the center console of the vehicle, as shown in the following figure.

4. the second button labeled "CD/aux" is both. The premise is to find the USB port (the USB port is on the front wall of the buckle box in the middle of the front seat) and connect the audio source. Finally, after the logo shown in the figure is displayed on the screen of Buick Regal, you can play the audio in the USB flash drive in the Buick Regal car.