I'm interested in trying to buy a raspberry pi and create a small bluetooth / airplay type module that I can plug into my car somehow and get wireless audio streaming.

I don't necessarily care about getting steering wheel controls, I really only care about audio at this point, plus I know there are some solutions that I can purchase other parts with to get that done, those are a little too expensive for me right now an I just want to get something a little more simple to get me started with raspberry pi.

My first thought is to either tap the CD changer cable somehow to pipe the audio into the system or take the disc changer out all together and plug straight into the existing port.

I have been looking for a connector that would let me do the latter but I have not found anything so far so I'm thinking the first option may be the way to go here but I'm not really finding much on this subject either.

Are there any tutorials or write ups that talk about patching into an existing CD changer or something similar with raspberry pi or something of that sort that I can be pointed to. I'm sure if I see the basic workings of getting the audio in it's just a matter of my imagination going to town on getting my phone to connect to the raspberry pi (which seems easy enough given all the numerous tuts I have found on that subject).

  • \$\begingroup\$ CD changers use digital protocols to enable playback. Its not as simple as tapping wires. \$\endgroup\$
    – Passerby
    Oct 25, 2014 at 3:37
  • 1
    \$\begingroup\$ The latter will require a wiring harness for your car model as well as some sort of amplifier. \$\endgroup\$ Oct 25, 2014 at 3:48

2 Answers 2


As noted in the comments, most modern car systems use a digital protocol to control the CD changer. Even if there are analog audio leads, the head unit won't recognize it without digital signals from the CD unit.

In any case, the solution will be specific to your car and possibly the specific head unit. If you search (Google, etc.) for your car's model and terms like "add aux input", you may find more detailed info. You may get lucky and be able to use a fairly inexpensive adaptor.


If all you are interested in for now is streaming audio from your Raspberry Pi to your car stereo, buy an audio to FM adapter like this one, they are only about $20. I use one to take audio from my iPhone and pipe it through my car stereo to listen to music or audio books!

The second line coming out of the left side of the device originally went to a cigarette-lighter-plug; I assume it is +5, if so then the plug could be cut off and the cable brought back to the Raspberry Pi for power as shown. But after cutting the cable, you should check the voltage.

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