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first check the illumation fuse which to toyota its the panel fuse, check if it is blown. if not take the aftermarket wire harness u wired in with the radio harness and disconnect the orange wire (illumation wire) and see if u have lights again. sometimes the aftermarket orange wire won't work with toyota vehicles. good luck
try changing the headlight switch,I had a similar problem only mine happened after I accidentaly short out when I was replacing the horn pad and for some reason when I replaced the headlight switch the problem went away.
did u know that they make a harness for your car that plugs into your factory harness and then adapts to your aftermarket radio? for the lights, you have blown the interior light fuse, it may be the same fuse as the cigar lighter.Below is your radio wire colors and what they do. 1990 Toyota Corolla Car Stereo Radio Wiring Diagram.
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
there is a wire that has been grounded that goes to all of your lights that you described...check the wiring and see if any wires are damaged. also check your fuses. also check for bad wiring harnesses.
first of all you should always use a wire harness when installing a unit into a vehicle you should never cut the factory harness but guess you already did so here is the wire diagram for your car hope this helps http://www.installdr.com/Harnesses/Mitsubishi-Wiring.pdf