Here is the audio stereo radio wiring information for your 2003 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. Please check it over and use it as a GUIDE only to help you locate the appropriate wires. This schematic is provided free of charge and may not be 100% accurate. Failure to properly test all the wires may lead to vehicle or bodily damage. All information is provided as-is and accuracy is not guaranteed.

If you find any conflicting info please leave a comment with what you found in your 2004 Toyota Celica. If you don’t see the audio radio wiring diagram you need comment and we will try to add it ASAP. Thanks for looking!

2004 Toyota Celica Audio Wiring Radio Diagram Schematic Colors – Aftermarket Stereo DIY Installation Help

Car Radio Constant 12v+ Wire: Blue/Yellow @ Radio Harness
Car Stereo Ground Wire: Brown @ Radio Harness
Car Radio Ignition Switched Wire: Gray @ Radio Harness
Car Radio Illumination Wire: Green @ Radio Harness
Car Radio Dimmer Wire: N/A
Car Radio Amp Turn On Wire: Red (+) @ Radio Harness
Reverse Trigger: Red/Black @ Under Center Console Black 13-pin plug, pin 13
Car Stereo Power Antenna: N/A

Left Front Speaker Wire (+) Positive: Pink
Left Front Speaker Wire (-) Negative: Purple
Right Front Speaker Wire (+) Positive: Light Green
Right Front Speaker Wire (-) Negative: Blue

Left Rear Speaker Wire (+) Positive: Black
Left Rear Speaker Wire (-) Negative: Yellow
Right Rear Speaker Wire (+) Positive: Red
Right Rear Speaker Wire (-) Negative: White

SPEAKER WIRE COLORS AT THE AMP BEHIND/UNDER THE GLOVEBOX

Left Front Door Speaker Wire (+) Positive: White
Left Front Door Speaker Wire (-) Negative: Black

Right Front Door Speaker Wire (+) Positive: Red
Right Front Door Speaker Wire (-) Negative: Black

Left Rear Door Speaker Wire (+) Positive: Yellow
Left Rear Door Speaker Wire (-) Negative: Black

Right Rear Door Speaker Wire (+) Positive: Blue
Right Rear Door Speaker Wire (-) Negative: Black

Center Channel Speaker Wire Positive / Negative: N/A

Subwoofer Speaker Wire Positive / Negative: N/A

Radio Size: Single or Double Din

Radio Removal Tools: – Dash Removal Plastic Pry Tools – Use the pry tools to pop the gear shift trim bezel then remove 2 phillips screws below the climate controls. Pull off the climate control knobs and remove 2 phillips screws behind them. Unclip the climate control / radio trim bezel and remove. Remove 4 10mm bolts holding the factory radio in. Keep a magnet handy they are easy to drop!

Keep in mind if you are installing a new radio in your Celica you need the wiring harness, the antenna adapter, and the mounting kit as well.

REQUIRED PARTS FOR AFTERMARKET RADIO INSTALL

WIRING HARNESS WITH FACTORY AMP:

WIRING HARNESS WITHOUT FACTORY AMP:

MOUNTING KIT FOR DOUBLE DIN AFTERMARKET RADIOS:

MOUNTING KIT FOR SINGLE DIN AFTERMARKET RADIOS:

ANTENNA ADAPTER:

N/A

SPEAKER ADAPTERS FOR AFTERMARKET SPEAKER INSTALL:

If doing front and rear speakers order 2 of these.

RECOMMENDED TOOLS FOR THE INSTALL – SAME ONES THE PROS USE!

– 3M Electrical Tape

– Klein Wire Cutters / Crimpers

– Install Bay Butt Connectors

– Dash Removal Plastic Pry Tools

– Gardner Bender Auto Wire Stripper