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Question:

How do I hook up a aftermarket stereo to my 91 corolla without using a wire harness adapter?

Theres a Green Illumination wire from the factory setup, where do I connect that wire too on my aftermarket deck? Also theres a White/Blue wire that I dont know where it connects either?

Answer:

Metra Wire Harness part number 70-1002 is the wiring harness for your truck.
The green illumination wire controlled the dimming on the factory stereo, but it will only apply if your tuner has the same feature. If it doesn't then just put a crimp cap on it and stow it out of the way. As for the white/blue wire, I'm not sure. If you pick up a wiring diagram, such as found in the Hanes manual, it will give you the breakdown. Not all the wiring in your car needs to be hooked up, just the ones that operate the tuner's functions and audio; if everything works and there's no left over wiring from your tuner's wiring bundle, then you don't need that white/blue wire. Crimp it off and tie it up to the bundle. This should be applicable to your year: Radio Constant 12V+ Wire: Blue/Yellow Radio Switched 12V+ Wire: Gray Radio Ground Wire: Brown Radio Illumination Wire: Green Radio Dimmer Wire: N/A Radio Antenna Trigger Wire: N/A Radio Amp Trigger Wire: N/A Front Speakers Size: 4″ Front Speakers Location: Dash Left Front Speaker Wire (+): Pink Left Front Speaker Wire (-): Purple Right Front Speaker Wire (+): Purple Right Front Speaker Wire (-): Light Green Rear Speakers Size: 4″ Rear Speakers Location: Rear Deck Left Rear Speaker Wire (+): Black Left Rear Speaker Wire (-): Yellow Right Rear Speaker Wire (+): Red Right Rear Speaker Wire (-): White

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