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my year 2009 Mercedes C class can pair with my iphone 5 no problem at all the car speaker can receive phone calls and I can talk hands free, also when I am using my iphone in the google map nav mode, the speaker speaks well through bluetooth connnection

the problem is when I listening music or watch videos, the speak doesn't work....

  • You may want to use a more descriptive title – Stevoisiak May 20 '17 at 0:09
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A common issue is the output selection in the media apps:

Make sure that on your phone, in the media screen, you have selected the correct output source (Bluetooth - Mercedes name) to play the audio (assuming audio is coming from the phone when it doesn't work)

If no audio comes (make sure volume is up) .. However, the Mercedes model / year may not support music playback.

As @tyson mentioned, inquire with the car manual for Bluetooth settings

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There are various Bluetooth profiles available as documented here. The various profiles enable only certain functions.

It maybe that your car needs to be paired more than once. The Bluetooth profile that handlers music is likely A2DP, whereas the other functions are likely handled by HFP or HID.

Check the manual for your in car audio system and see if it's paired in all modes.

For example, I have a Toyota, and when setting up s new device there are effectively two pairings, each handles certain audio functions.

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    A BT device from 2000 is going to be running Bluetooth 1. I'm not even sure that can do A2DP, which was first introduced in 2003. – Tetsujin Apr 9 '16 at 10:12

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