How to Input Bluetooth to AUX

by Jeff Grundy

Bluetooth is one of the older wireless technologies and has been around since 1999, but it really did not become popular until mobile devices such as the iPhone, Android smartphones and mini-sized MP3 players became mainstream products during the mid-2000s. Many smartphones and MP3 players support audio streaming over a wireless Bluetooth connection. Therefore, if you have such a portable device, you can connect it to your car or home stereo and listen to music on the player without headphones. Even if the stereo does not have native Bluetooth support, you can connect mobile players by connecting a Bluetooth adapter to the “AUX” or “Auxiliary” input.

Adding Bluetooth to a Car Stereo

Power off the car stereo. Connect the power adapter cable to the Bluetooth adapter, and then plug the other end into your car’s cigarette lighter adapter.

Connect the 3.5 mm cable end from the Bluetooth adapter to the “Aux” or “Auxiliary” port on the car stereo. Some Bluetooth car adapters come with an attached 3.5 mm cable; however, you may have to connect the 3.5 mm cable to the adapter before connecting it to the car stereo. Many newer car stereos have a 3.5 mm Aux port on the front face of the unit, but some older models may only have RCA Aux or Auxiliary input on the rear of the stereo. If the stereo only has an RCA port, you must use a 3.5 mm to RCA plug adapter with a female 3.5 mm port and two male RCA plugs to connect the Bluetooth adapter to the car stereo.

Use the included Velcro tape or mounting hardware to mount the Bluetooth adapter on your car’s dashboard. Select a location on the dash that provides the most exposure to other seats and areas in your automobile. For instance, if your car has bucket seats, mount the adapter in the center of the dash above the car stereo so devices in the passenger and rear seats can receive a better signal. Some car stereo Bluetooth adapters include a Left/Right channel switch that you can set to receive stronger Bluetooth signals from the driver or front-passenger seat.

Power on the car stereo and ensure that the input source is set to “Aux” or “Auxiliary” mode. The Bluetooth adapter powers on after you turn on the car stereo.

Refer to the Bluetooth adapter to determine the correct button to press on the device to activate Pairing or Discover mode. Some car stereo Bluetooth adapters have a “Search,” “Pairing” or “Discover” button on the face. With other adapters, you might need to press a combination of "Arrow" or "Volume" buttons to enable Pairing mode.

Enable Bluetooth mode on the wireless music device. For instance, to activate Bluetooth on an iPod, tap “Home | Settings | General | Bluetooth,” and then swipe the “On/Off” switch to the right to enable the wireless connection. Wait for a list of detected Bluetooth devices to display on the mobile device screen.

Tap the name of the car stereo Bluetooth adapter in the list of detected devices, and then tap “Connect” or “OK.” If prompted, enter the pairing password on the mobile display, then tap “Connect” or “OK” again. If you don’t know the pairing password for the car stereo adapter, refer to its user guide or instructions.

Play music on the mobile device as you normally would. After you press "Play," music from the mobile device streams to the Bluetooth adapter and plays over the car stereo speakers.

Adding Bluetooth to a Home Stereo

Power off the amplifier or receiver. Connect the AC power adapter to the Bluetooth adapter, then plug the other end of the cord into an available electrical outlet.

Connect the red and white RCA plugs on one end of the audio cable to the “Audio Out” or “Aux Out” port on the rear of the Bluetooth adapter. Connect the other end of the cables to the “Left” and “Right” channel ports under the “Aux” or “Auxiliary” header on the rear of the amplifier or receiver.

Power on the amplifier or receiver first, then turn on the Bluetooth adapter. Press the “Connect,” “Discover,” “Pairing,” “Sync” or other similarly named button on the Bluetooth adapter box.

Enable Bluetooth mode on your wireless mobile device, then connect to the detected Bluetooth adapter connected to the amplifier or receiver. Enter the pairing password when prompted, and then tap “Connect” or “OK.”

Press the “Auxiliary” or “Aux” source button on the amplifier or receiver. Open the music player application on the mobile device and press or tap “Play.” Music from the mobile device plays over the loudspeakers connected to your home stereo amplifier or receiver.


  • If your home stereo amplifier or receiver does not have an “Aux” or “Auxiliary” port, you can connect the Bluetooth adapter to an unused “CD,” “DVD” or “Line In” port.
  • Do not connect the Bluetooth adapter to ports labeled “Phono,” “Tape” or “Tape Monitor,” as doing so will probably result in distorted sound or no audio at all.

Items you will need

  • 3.5 mm to 3.5 mm audio cable (optional)
  • 3.5 mm to RCA plug adapter (optional)
  • RCA audio cables

About the Author

Jeff Grundy has been writing computer-related articles and tutorials since 1995. Since that time, Grundy has written many guides to using various applications that are published on numerous how-to and tutorial sites. Born and raised in South Georgia, Grundy holds a Master of Science degree in mathematics from the Georgia Institute of Technology.

Photo Credits

  • Jack Hollingsworth/Photodisc/Getty Images