Hi guys, if you want to install an Eonon BMW E46 navigation head unit GA5150F Android Car DVD Player, we have some suggestions for you to follow and get sound for your new unit if you found there’s no sound after installation.

First, there’s no sound for navigation function. Please kindly understand that the sound is transferring from the unit to your car speakers through your car’s AUX function. And in order to transfer sound from the BMW E46 unit to your car speakers, your car should be with AUX function and it has been activated and works well now,

Then please check whether you have connected the small speaker from the arrival of the package, this little speaker use, if you are using a radio or CD player to play the sound of the original Car DVD Players, see the following picture, you should have a connection to this Speakers widget.

If you have this speaker is properly connected, but there is no perfect navigation feature, you can check the settings. From the main menu navigation, you should check this little speaker, if you do not check this, it is not our little stereo speakers, so you should check, and then select it. When you listen to your car radio, then you can click "Navigate" button, from our controller into the navigation, so you can hear the sound of our small speaker navigation.

You may ask “there is no sound USB media playback.”

Then you need to find your own auxiliary lines (if your car has AUX function) is connected with our plug auxiliary cable to play sound. Do not buy aftermarket BMW GPS device, if your BMW E46 without auxiliary function or auxiliary function has no effect.

Please check your car's AUX has been activated, the first from the original CD Press AUDIO button and you can through the right side of the steering assist function knob to change the AUX volume, make sure that it's not dumb.

From the auxiliary cable red cable is the left channel,
From the auxiliary line white cable is the right audio
From the auxiliary cables black cable is GND.

When you have completed the above steps, if still no sound from USB feature, you should not include the auxiliary cable from the back of the device plug factory, so you will find your auxiliary cable, then connect them to our plugin let your secondary job, and a voice. You can view our plug and auxiliary lines are as follows:

Be sure to check this installation manual BMW E46 GPS navigation equipment before installation, there are more tips from the manual.

Incidentally, if your car has 2 fiber optic cable plugs from the factory, then you need to move it to our plug-in to get a radio factory. And we also have some installation tips for Mazda 3 Navigation, you can search Eonon on google for knowing more details, thanks.
http://www.eonon.com/Car-GPS/Android-Car-GPS/Mazda/GA5163F.html