Plug one end of the audio cable into the headphone port on your mobile device and the opposite end to the AUX port. Press the AUX button on your car stereo or toggle the input button to select the AUX input. Set the volume on your mobile device to about 50 percent, then start the devices music player.

How does the AUX work in a car?

An aux-in (or auxiliary-in) socket in your car is a 3.5mm jack into which you can plug anything that has a standard headphone connection. It sends sound to the multimedia system, enabling you to stream music from a device through the cars speakers.