How do you remove the rear speakers from a 2004 chevy impala?

https://www.modifiedlife.com/2004-chevrolet-impala-car-radio-wire-guide/

Here is a free wire diagram color coded for a 2000 Chevy Impala LS:
Battery Constant 12v+ Positive Wire (Yellow): The constant 12V+ wire is yellow.
Starter Positive Wire (Purple): The starter wire is purple.
Ignition Positive Wire (Red): The ignition wire is red.
Second Ignition Positive Wire (Pink/White): The second ignition wire is pink/white.
Accessory Positive Wire (Orange): The accessory wire is orange.
Power Antenna Turn On (Blue): The power antenna wire is blue.
Amplifier Turn On (Blue/White): The amplifier wire is blue/white.
Left Front Speaker Positive Wire (+): The left front speaker wire is tan.
Left Front Speaker Negative Wire (-): The left front speaker wire is gray.
Right Front Speaker Positive Wire (+): The right front speaker wire is light green.
Right Front Speaker Negative Wire (-): The right front speaker wire is dark green.
Left Rear Speaker Positive Wire (+): The left rear speaker wire is brown.
Left Rear Speaker Negative Wire (-): The left rear speaker wire is yellow.
Right Rear Speaker Positive Wire (+): The right rear speaker wire is dark blue.
Right Rear Speaker Negative Wire (-): The right rear speaker wire is light blue.

Question edited for clarity.

Question moved to sub category.

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2004 Chevrolet Silverado March 31st, 2012
Posted in Chevrolet Silverado

2004 Chevrolet Silverado Stereo Wiring Information

Radio Constant 12V+ Wire: Orange
Radio Ignition Switched 12V+ Wire: Class 2 Serial Data
Radio Ground Wire: Black/White
Radio Amplifier Trigger Wire: Pink
Left Front Speaker Wire (+): Tan
Left Front Speaker Wire (-): Gray
Right Front Speaker Wire (+): Light Green
Right Front Speaker Wire (-): Dark Green
Left Rear Speaker Wire (+): Brown
Left Rear Speaker Wire (-): Yellow
Right Rear Speaker Wire (+): Dark Blue
Right Rear Speaker Wire (-): Light Blue

2004 Chevrolet Silverado Speaker Sizes
Audio Front Speakers Size: 6.5?
Back Speakers Size: 4? x 6?

The following information is currently not available:
Radio Illumination Dimmer Wire
Radio Antenna Trigger Wire
Front Speakers Size
Rear Speakers Size

https://www.google.com/search?q=2004+Chevy+LS+2500+radio+wiring

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This video is not on an Impala, but a quarter window is a quarter window. It should give you an idea of what needs to be done.
How to Replace Quarter Window

2000 Chevrolet Impala Car Stereo Radio Wiring Diagram
Car Radio Constant 12v+ Wire: Orange
Car Radio Switched 12v+ Wire: Yellow
Car Radio Ground Wire: Black
Car Radio Illumination Wire: Gray
Car Stereo Antenna Trigger: White
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
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

It should just be a Phillips head screw. if not and the head is a button head you might could get a pair of vice grip needle nose pliers and crimp down on it then unscrew it that way.

you can access them from under the package tray inside your trunk compartment

Yes it should, A trick I use when this happens is to beat the lug bolts out, and the rotor will fall off. When you put it all back together use a socket and the lugnut to reseat them.

I have a 2004 Chevy impala the check engine light came on and the car is revving high and putters what would cause this?