1. Adjust the volume setting: Check the volume setting of the car audio system to ensure that the volume is adjusted correctly. It can be adjusted through the volume button or the sound system control panel.

2. Adjust the sound source settings: Some car audio systems may automatically adjust the sound source volume. You can check the setup interface of the sound system to confirm whether there are options to adjust the sound source volume.

3. Adjust sound effect settings: Some advanced sound systems may provide multiple sound effect modes, such as sound stage mode and equalizer. You can try to adjust these settings to get the correct volume and sound effect.

4. Check the sound source equipment: If external sound source equipment (such as mobile phone, MP3, etc.) is used. ), please make sure its volume setting is appropriate. Some sound source devices may have independent volume control functions.

If the above methods can't solve the problem, you can consider contacting your local car dealer or car repair station for their help and advice. They may have a more professional solution to adjust the volume of the sound system.