Here's how to tap into your car's stereo and add an auxiliary input to connect your phone or MP3 player. This mod will only cost $1 for the cable.

Full DIY Writeup available here:
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A 3.5mm auxiliary input jack or plug will allow any device player to stream sound through your vehicle's stock sound system.

This video details the disassembly of the radio down to the motherboard. Extension wires are then soldered to the three possible inputs that can be tapped into - CD player, Cassette player and AM/FM radio tuner. All three of these inputs are clearly labeled on the bottom of the board as "L" "R" and "GND" for left, right and ground connections to the 3.5mm plug.

This hack will work on most stereos that use an analog audio input to the equalizer chip. In some cases, it is necessary to use a silent CD or cassette to trick the radio into reading sound from that respective input. For the best sound quality, a silent CD with the AUX connected to the analog CD lines is preferred, though modern radios use a digital CD signal which won't work.

The three methods are then tested in the vehicle after the radio is put back together and proved to work. The analog input of the phone/music player overrides the sound coming through the CD, radio or cassette. Some phones that feature headphone detection may not detect the cassette player due to the impedance.

This video was demonstrated on an Infiniti G35 with an OEM stock head unit with navigation.

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