well, you need to specify if you are going to replace the speakers with stock speakers or with aftermarket speakers.-Shocker
I don't know how much relevance the previous answer has, but you need to remove the bottom of the seat by pulling up to get the tabs to release. The seat then un-bolts with two 10 mm nuts. The seat back can be removed. The inside quarter panels can be removed by pulling and sliding the header channel out of the front. There are three shield clips that then must be removed from the bottom of the rear deck/upholstery assembly. This allows the rear deck to be removed but the sound-proofing/padding is glued to the trunk lid so the whole assembly must be lowered into the car unless you want rip it where it is glued.
Once the rear-deck lid is removed, the speaker assembly can be removed. First un-hook the two clips on the right side of the assembly and slide the tab out of the slot on the left. There is a gasket that is applied to the bottom of the speaker assembly, presumably to prevent rattling that holds the assembly to the body. This gasket is quite strong, so you will need to apply some pressure. Finally, before removing the assembly from the car, separate the pigtail by depressing clip and slide it out.
From there, 4 T-10 Torx screws hold the speaker to the assembly with another gasket that is again makes it difficult to separate. Gently pry apart with a screw driver if necessary.
I do not believe that the mounting bracket from which you separate the speaker is designed for a standard 6x9" and thus there are two tabs that must be removed. Heat a razor blade up and slice them off with the hot knife. Finally if you want to re-use the pigtail ends on the speaker, they can be removed.
The wiring information from http://www.modifiedlife.com/2003-Chevrolet-impala-car-stereo-radio-wiring-diagram/ indicates that:
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 Iconoclast Hero
Front door speakers - 6.5 rear speakers - 6x9
They should be 6x9's.
deal with it buddy
about $250
do you need to remove dashboard in 2003 chevy impala to replace heater core
very carefully
how do you replace a transmission pressure control solenoid in a 2003 chevrolet impala
The back package tray will have to come out to get to the bolts that hold them in.
i need a step by step instruction on how to remove or replace a radiator of a 2005 3.4L chevy impala
Remove the covers from your 2003 Chevrolet Avalanche speakers. Remove the speaker retaining screws. Remove the wiring harness from the back of the speakers. Reverse the process to install the new speakers.
Impala HQ .com
Yes, you can purchase it from a parts house.