I understand the wiring diagrams for the car, but I am not sure what to do about the blue / YELLOW and one of the browns. I am confused because there is a blue wire and a yellow wire (not streaked), and there are two browns. I would buy a wiring harness, but they don't sell one that fits on the premium sound.
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Lounis Zenad
Assuming you're trying to install a head unit, first try this:
the plugs that go into the back of the factory radio, are in bundles of wires that run to another set of plugs just behind/next to them, back there behind the dash opening. Unlike the plug(S) that goes into the back of your radio, these 2nd pair of plugs should plug right into a standard toyota wiring harness (Metra 70-1761 or equivalent.). From there, it's just a matter of matching up the wires of your aftermarket head unit's harness with the wires labeled on the metra harness. for most aftermarket head unit's made in the last 5 or so years, the colors will be the same as the metra colors.
If all of that doesn't work, next you should try this harness from scosche.
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Ethan
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