$10 Bluetooth Stereo Hack

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Here's how to tap into your car's radio and install a Bluetooth - auxiliary audio connection for less than $10 in materials!

This project involves opening up the radio, investigating the circuitry and dialing in on an analog input signal that can be overridden with an auxiliary signal. In this video, the standard CD-AM/FM stereo from a 2004 Toyota Camry is disassembled, and the central chip that controls the audio signals, a TA2123AF micro controller is tapped into on the CD-input lines.

In order to trick the radio into reading from the CD input, a CD-ROM with a silent track is inserted into the radio. Thus the Bluetooth-auxiliary audio signal overrides the silent signal, resulting in CD-quality sound.

The main components for this project are:
- 3.5mm stereo aux wire
- Bluetooth 3.5mm adapter
- 12V power inverter
These components can be had for less than $10 depending on which parts are chose, from Amazon or eBay online.
Optionally, a 3.5mm inline ground loop isolator can be used on vehicles that experience noise through the speakers.

Wiring the Bluetooth module outside of the stereo will result with less of a chance of interrupting power distribution and audio quality of the signal, though for a cleaner look, it can be packaged all into one. A 12V external power source, the cigarette lighter, is tapped into to power the power inverter, which in turn, powers the Bluetooth module, and that sends the audio signal through the 3.5mm cable to the radio's micro-controller chip.

This hack should be applicable to most Toyota and Lexus stereos, as well as other radios built by Fujitsu.


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