How to install the volume key function on the old Honda crv?

The methods of installing the volume key function on the old Honda crv include: replacing the car audio system, using the Bluetooth audio controller and installing the steering wheel volume control device.

1. Replace the car audio system: replace the original car audio system with a new one that supports the volume key function.

2. Use Bluetooth audio controller: You can purchase a Bluetooth audio controller that matches the car audio system, connect your mobile phone or other Bluetooth devices through Bluetooth, and adjust the volume through the volume button on the controller.

3. Install the steering wheel volume control device: Some vehicles are equipped with the steering wheel volume control device.