2000 Toyota Celica | Car Audio Wiring Diagram Dec 04, 2015Here is the audio stereo radio wiring information for your 2000 Toyota Celica with the standard or amplified systems. It will be useful when installing a stereo sound system, aftermarket headunit radio, or other automotive accessories. Make sure to grab the appropriate tools to test all the wires in your Celica. 2000 toyota celica headlight wiring - the12volt 2000 toyota celica headlight wiring - im installing some glow gauges on a 2000 celica gt-s that need a power source that will turn on the gauges with the headlights. can anyone tell me what wires to use for the (+) and (-)ksAdam..