There are various methods to set the volume of the integrated car navigation system, and the specific methods are as follows:

1. On the panel of the car DVD navigation and reverse image all-in-one machine, you can usually find the volume adjustment button or knob to adjust the volume.

2. If the integrated car navigation system is a touch screen, you can click on the "Settings" or "Volume" options on the screen to enter the volume adjustment interface for adjustment.

3. If the car navigation system is connected to a multifunctional steering wheel, volume adjustment can also be made on the steering wheel.

It should be noted that when the integrated car navigation system starts the reverse image in reverse gear, the volume cannot usually be adjusted, and there is no volume adjustment available at this time.