LOL Toyota is cRAZy with there color schematics... I just put in an after market radio and thought i could do it on my own but I had to buy a haynes manual AND even then it was hard to read.
but here hope this helps..This is for my 1998 camry:
Car Stereo Radio Wiring Diagram - 1999 Toyota Camry
Whether your an expert installer or a novice enthusiast with a 1999 Toyota Camry, an automotive wiring diagram can save yourself time and headaches. One of the most time consuming tasks with installing a car stereo, car radio, car speakers, car amplifier, car navigation or any mobile electronics is identifying the correct wires for a 1999 Toyota Camry.
The Modified Life staff has put their heads together to create an invaluable resource containing car stereo wiring diagram, car wiring diagram and radio wiring diagram. Feel free to use any car stereo wiring diagram that is listed on Modified Life but keep in mind that all information here is provided “as is” without any warranty of any kind. Use of the wiring information is at your own risk. Always verify all wires, wire colors and diagrams before applying any information found here to your 1999 Toyota Camry.
Radio Constant 12V+ Wire: Blue/Yellow
Radio Switched 12V+ Wire: Gray
Radio Ground Wire: Brown
Radio Illumination Wire: Dark Green
Dimmer Wire: White/Green
Antenna Trigger Wire: None
Front Speaker Size: 6 1/2″
Front Speaker Location: Doors
Left Front Speaker Wire (+): Pink
Left Front Speaker Wire (-): Purple
Right Front Speaker Wire (+): Green
Right Front Speaker Wire (-): Blue
Rear Speaker Size: 6″ x 9″
Rear Speaker Location: Rear Deck
Left Rear Speaker Wire (+): Black
Left Rear Speaker Wire (-): Yellow
Right Rear Speaker Wire (+): Red
Right Rear Speaker Wire (-): White
also here is the web link if you have diffrent year car :
http://www.modifiedlife.com/car-stereo-rad...9-toyota-camry/