Auxiliary Stereo Input Hack

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Here's how to tap into your car's radio to add an auxiliary sound input, so you can connect your MP3 player or phone.

There's no need to replace your age old cassette deck for a cheesy looking aftermarket unit. Forget those FM transmitters, and cassette aux adapters. Wire the aux directly to your car's internal sound circuitry to get crystal clear CD quality sound!

The best part is, all you need is a 3.5mm stereo cable, which costs $1 at the dollar store!

This video demonstrates the addition of an aux line on a Toyota JBL Stereo from a 1999 Toyota Solara. Model # Fujitsu Ten 122000-09200101 or Toyota part number 86120-AA020.

Also illustrates the process of removing and installing the stereo from a 97-01 Camry and 99-03 Solara.

The hack relies on being able to trace the output from the tape deck to the equalizer. Solder two R&L wires to the output pins of the equalizer chip, which in this case was clearly labeled on the motherboard. Use a 3.5mm stereo extension to route the wires outside the stereo into the console, where you can connect an MP3 player, phone, bluetooth headset, iPod or iPhone.

Enable the tape or FM radio mode to open the auxiliary port. Mine will automatically over-ride the audio coming from the FM source.

On some cell phones with jack detection (such as the Samsung Galaxy S5), the radio must be off before the phone is plugged in and the music is played. Otherwise, the phone won't detect a headphone plugged in and you'll hear the FM radio plus lots of static.

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