Question: how aux works in car?
Answer: Connect your mobile device to your car's AUX port using a 1/8-inch-to-1/8-inch audio cable. 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.