2001 GMC Sierra C3 How to get front door panels off

I have a 2008 Silverado and noticed my chime was not working. They work off the front door speakers. Found out GM put the cheapest speakers on the market in them. Bought a new pair of Kenwood speakers from Crutchfield and installed them last week. They sound great. I will probably install Kenwood's in the rear doors since it's only a matter of time before they die too.

2002 GMC Sierra C1500 Car Radio Wire Color Codes
Car Radio Battery Constant 12v+ Wire: Orange
Car Radio Accessory Switched 12v+ Wire: Yellow
Car Radio Ground Wire: Black/White
Car Radio Illumination Wire: Brown
Car Stereo Dimmer Wire: Gray
Car Stereo Amplifier Location: Under the center console.
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: N/A
Car Audio Rear Speakers Location: N/A
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

I think your GMC have in-door rear speakers.!!

• Look for screws in door panel or around the speaker vents.
• If you are sure that the speaker cant be removed without opening the door panel then read this below.
  

• Mostly seen near areas like door lever(inside), power window switch set, bottom and each sides of the whole panel.
• If its manual window, then look for a circle clip in between the winding window lever and the door panel. Plunge screw driver between them a make a gap then look.
• Assure that all clips or screws which obstacles the removal of the panel.
• Simply pull the panel from sides towards you
  
• If its completely open, then locate the speaker and unscrew it.
• Check the connection wires for quality
• Mostly its good to scratch the leads of the wire to remove copper oxide layer
• Take the new speaker, check the holes on the door matching the speaker's
• If needed, drill hole for screw and be sure that the new speaker is not more than 15cm diameter.
  
• Connect the leads, fix the speakers.
• Check the sound clarity with your car audio on.
• If everything is perfect.. go on , fix the door panels
• Mainly sure with the side clips of the panel, do not bent or break them.
• Check for any balance parts or screws.
• Screw everything back as normal.
• You just installed a new speaker....
• pls rate it!!
  

sorry but the panel needs removed, go on be brave its not all that hard to do .adrian,,

pull your door panel off and unscrew the speaker and disconnect the connectors to speaker 

NO' YOU DONT NEED TO REMOVE THE ENTIRE DOOR PANEL, TO REPLACE SPEAKERS CONNECT WIRING CONNECTOR TO SPEAKER FIT SPEAKER BACK IN GRILLE AND REPLACE RETAINING SCREWS.

On the inside trim, you can remove screws that are by the door handle, arm rest, under door and side of door and then gently pull back on the panel as there will also be retaining clips attached and you don't want to break them. You'll need to lift the door panel upwards in order to get it off the window ledge.

1999 GMC Sierra Truck Radio Wiring Guide
Car Radio Battery Constant 12v+ Wire: Orange
Car Radio Accessory Switched 12v+ Wire: Yellow
Car Radio Ground Wire: Black/White
Car Radio Illumination Wire: Brown
Car Stereo Dimmer Wire: Gray
Car Stereo Antenna Trigger Wire: N/A
Car Stereo Amp Trigger Wire: N/A
Car Stereo Amplifier Location: N/A
Car Audio Front Speakers Size: N/A
Car Audio Front Speakers Location: N/A
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: N/A
Car Audio Rear Speakers Location: N/A
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
-->

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: N/A
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: Dash
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: 5 1/4′
Car Audio Rear Speakers Location: Rear Doors
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

Those are 5 Inch Speakers and Tweeters I do Believe.