I need to know the size speakers that are in my car

In this link

2002 Toyota Avalon Car Radio Wire Diagram - MODIFIEDLIFE

https://www.modifiedlife.com > 2002-toyota-avalon-car...
2002 Toyota Avalon Car Radio Wire Diagram ; Left Front Speaker Positive Wire (+), Pink ; Left Front Speaker Negative Wire (-), Purple ; Right Front Speaker ...

try google images

Only the electric wiring diagram has 360 pages. Impossible to post anything of that here. Sorry

Your first problem is to extract the bolt. For that, you will need an extraction tool. I got mine at NAPA.

Once you have the bolt out, you can measure the size and pitch.

If the alarm system has a battery remove it otherwise removing the car battery for a while may reset it. In emergency contact your local toyota dealers mechanics department and they may be able to help you at no cost.
If you put a general enquiry on google you might get lucky, do not be too specific. i.e. toyota 1994 alarm reset procedure

On this website you find fuse box diagram and description for Toyota Avalon (1996)


Toyota Avalon First Generation XX10 1996 fuse box diagram Auto Genius

Open the trunk and pull back the carpet behind the lights. If i remember correctly there are two bolts on each side that you need to remove. Once they are off, use a little bit of force and pull the entire plastic light casing (from the outside of the car) to the left (if you are on the left side of the car) or to the right (if you are replacing the right side lights).

Check this for 1996 Toyota Avalon 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 Power Antenna Trigger Wire: Black/Red
Radio Amplifier Turn On Trigger Wire: N/A
Front Speakers Size: 5 1/4" Speakers
Front Speakers Location: Doors
Left Front Speaker Wire (+): Pink
Left Front Speaker Wire (-): Purple
Right Front Speaker Wire (+): Light Green
Right Front Speaker Wire (-): Blue
Rear Speakers Size: 5 1/4" Speakers
Rear Speakers Location: Rear Doors
Left Rear Speaker Wire (+): Black
Left Rear Speaker Wire (-): Yellow
Right Rear Speaker Wire (+): Red
Right Rear Speaker Wire (-): White

Hope helps (remember to rate and comment this free answeer).

here are the wire colors for your radio harness, hope this helps figure your issue out.


1996 Pontiac Bonneville Car Stereo Wire Diagram
Car Radio Battery Constant 12v+ Wire: Orange
Car Radio Accessory Switched 12v+ Wire: Yellow
Car Radio Ground Wire: Black
Car Radio Illumination Wire: Gray
Car Stereo Dimmer Wire: Brown
Car Stereo Antenna Trigger Wire: Pink
Car Stereo Amp Trigger Wire: N/A
Car Stereo Amplifier Location: N/A
Car Audio Front Speakers Size: 4′ x 6′
Car Audio Front Speakers Location: Doors
Left Front Speaker Positive Wire (+): Tan
Left Front Speaker Negative Wire (-): Gray
Right Front Speaker Positive Wire (+): Light Green
Right Front Speaker Negative Wire (-): Dark Green
Car Audio Rear Speakers Size: 6′ x 9′
Car Audio Rear Speakers Location: Rear Deck
Left Rear Speaker Positive Wire (+): Brown
Left Rear Speaker Negative Wire (-): Yellow
Right Rear Speaker Positive Wire (+): Dark Blue
Right Rear Speaker Negative Wire (-): Light Blue

Check all your fuses in the fuse box. A fuse must have cut off.