How do I get my Mercedes into AUX Mode?

Scrolling all the way down is sometimes necessary to see the AUX setting.

For the CoolStream CarPro to work, you need to have at least 1 song saved to the music library on your iPhone or Android phone.  If you have an iPhone, we recommend buying a song from iTunes and saving it to your iPhone.  Here are some quick steps.

  1. Go to the iTunes Store app. It is the icon with a pink background and white star.
  2. Tap on Music
  3. Pick a song from iTunes
  4. Tap the Price.
  5. Enter your Apple ID
  6. You can tap downloads to see the progress of the download.

If you only use streaming apps and this will be the only song you will own, please note that the CarPro will launch this song first after initialization is complete.  To stream from your app, such as Spotify, you will need to open the app to play music from Spotify.

The Mercedes stereo also needs to be in AUX Mode for the CoolStream CarPro to work.  Sometimes it can be a bit tricky to find the AUX Mode.  CoolStream recommends that you consult your Mercedes Owners’ Manual to find the correct way to switch your stereo to AUX mode.

But if the manual cannot be located or proves to be less than helpful, here are a couple of tips that we have received from Mercedes owners.

Solution #1

AUX mode tip for C300

Press the “DISC” button until Audio appears on the screen’s menu.

Select “Audio” from the menu using the control knob.  A drop-down menu should appear.

Scroll to the bottom of the drop-down menu and select “AUX”.  Sometimes “AUX” may not appear until you scroll down.

Make sure that your Mercedes is in Park.  You may also have to turn the key to the second position (battery power).

Solution #2

Press the “DISC” button repeatedly until the AUX menu appears.


Solution #3

CD mode GLK350

  • Hold down the “DISC” button until CD or CD/MP3 appears on the screen.  This is CD mode.
  • Use the command knob to scroll over to the “CD” option and select it.

AUX mode

  • AUX option should now appear.  Use the command knob to select it.


Solution #4

  • Press the “DISC” button once and then press the “SYS” button until the AUX menu appears.


Solution #5

For those Mercedes owners that have the following button selection, we have 1 more suggestion.

CDC button for AUX mode
2009 Mercedes with CDC button
  • Hold the “CDC” button down for 5 seconds until the AUX Menu appears.

If you have more tips for getting your Mercedes into AUX mode, please leave a comment below, and we will update this FAQ.

Author: CoolStream Update

Trying to provide the best customer service possible.

7 thoughts on “How do I get my Mercedes into AUX Mode?”

    1. You will need to look at the back of your glove box to check for an MMI interface port. One end of the cable will plug into this port, and the other will connect to the CarPro. Mercedes makes replacement 30-pin iPod cables. For a 2011 C350, you will need Mercedes-Benz iPod cable part number 0018278504.

    1. When you can successfully pair your phone to the CoolStream CarPro but cannot hear any music, it generally means that you do not have a song that you have purchased downloaded and saved to the music library on your phone. Please see this FAQ for detailed instructions on buying a song for iPhone and Android phones. This one song will complete the communication between your phone and your car stereo. You can then stream music from Spotify or YouTube, or other apps to the CoolStream CarPro.

    1. The cable needed for your Mercedes will depend on the year, make, and model. With that information, we can guide you as to the right Mercedes MMI cable for your vehicle.

Leave a Reply

Your email address will not be published. Required fields are marked *