Thus, we’re going to look at how to modify your existing stock car stereo to accept an auxiliary cable input or even a Bluetooth module ... or the external feed. Install that switch somewhere ...

The Yatour Bluetooth car adapter takes the place of the CD changer of your car. Even if your car doesn’t have a CD changer, ...

In this project [Ryan] shows how he added Bluetooth audio to the stock stereo of his Toyota Matrix. The work he did with his add-on hardware is quite good. And the installation was surprisingly easy.