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I have done this on my personal Camry radio, it's the jbl 6 disc in dash unit on an 03 Camry. With my unit, the solder points were on the cd changer module inside the unit. On the cd changer motherboard, I believe near the connector that leads to the main board, there's a few test points labeled something like "L AUDIO" and "R AUDIO". I don't remember exactly what they said but it was obvious once I saw them. The way it works with my unit is i put the unit in cd mode and when an mp3 player is plugged in, it over-rides the output from the cd player and when it's unplugged you hear the audio from the cd playing.
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