How do I remove door sill plates on 2004 silverado

Question edited to add the Maker.

Videos that may help

https://www.google.com/search?q=remove+door+sill+plate+from+2021+Nissan+Leaf

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transfer case shift control module
Transfer Case Shift Control Module Replacement
Removal Procedure
Important: The transfer case shift control module (TCCM) is located under the drivers seat carpet. For removal purposes, access the TCCM from underneath the carpet.
Remove the drivers bucket seat or split bench seat. Refer to Front Seat Replacement - Bucket or Split Bench Seat Replacement.
Remove the left front sill plate. Refer to Front Side Door Sill Plate Replacement.
Remove the left hinge pillar. Refer to Body Hinge Pillar Trim Panel Replacement - Left Side.
Remove the left center pillar. Refer to Center Pillar Lower Trim Panel Replacement.

Remove the door opening weather-strip. Refer to Door Opening Weatherstrip Replacement in Doors.
Remove side sill trim plate. Refer to Door Sill Plate Replacement in Interior Trim.
Remove the lower quarter panel trim. Refer to Rear Quarter Trim Panel Replacement in Interior Trim.
Remove the center pillar upper trim panel. Refer to Center Pillar Upper Trim Panel Replacement in Interior Trim.
Remove the quarter upper trim panel. Refer to Rear Quarter Upper Trim Panel Replacement in Interior Trim.
Remove the center pillar outer applique. Refer to Center Pillar Applique Replacement in Exterior Trim.
Remove the roof drip molding. Refer to Body Side Roof Drip Molding Replacement in Exterior Trim.

Important: It is necessary to use new nuts when reinstalling the quarter window.
Remove the nine quarter window nuts (1), securing the quarter window assembly (2) to the body opening.
Caution: When working with any type of glass or sheet metal with exposed or rough edges, wear approved safety glasses and gloves in order to reduce the chance of personal injury.
Important: When removing the quarter window from the body opening make sure that the attaching pins are clear of the outer body.
Remove the quarter window (2) from the body opening.

Remove the rear seat cushion. Refer to Rear Seat Cushion Replacement in Seats.
Remove the rear seat back. Refer to Rear Seat Back Replacement in Seats.
Remove the door sill plate. Refer to Door Sill Plate Replacement .

Remove the 3 quarter trim panel retaining screws (1).
Starting at the lower edge of the trim panel and moving alternately clockwise and counterclockwise, pull outward on the trim panel to disengage the eight rear quarter trim panel attaching clips (2).
Remove the quarter trim panel from the vehicle.
Remove the 4 radio speaker grille speed clips (1), securing the speaker grille.
Remove the speaker grille (2).
Remove the rear quarter trim panel insulator (1), from the back of the quarter trim assembly (2).
Remove 7 rear quarter trim panel armrest retaining clips (1).
Remove 7 rear quarter trim panel armrest retaining nuts (2).
Gently pry the quarter trim panel armrest insert assembly (3), away from the rear quarter trim panel and remove.

You mite look for a video on youtube !

Same place you fill for the front washer fluid ! Your fronts work but not the rear ? There are to washer pump motors on the washer fluid bottle , one for the front an one for the back . Rubber hose goes all the way to the back . If that hose has failed ,to replace it you basically have to pull out your vehicles interior .
Rear Window Washer Hose Replacement - Pump to Endgate
Removal Procedure

1. Remove the left front seat. Refer to Bucket Seat Replacement in Seats.
2. Remove the rear seat. Refer to Rear Seat Replacement in Seats.
3. Remove the endgate/liftgate door sill plate. Refer to Rear Floor Rear Trim Plate Replacement or Liftgate Door Sill Plate Replacement in Interior Trim.
4. Remove the left front and left rear door sill plates. Refer to Door Sill Plate Replacement in Interior Trim.
5. Remove the left body side trim panel. Refer to Body Side Trim Panel Replacement in Interior Trim.
6. Remove the left hinge pillar trim panel. Refer to Body Hinge Pillar Trim Panel Replacement - Left Side in Interior Trim.
7. Fold over the left side of the carpet to allow access to the body harness. Refer to Front Floor Mat/Carpet Replacement and Rear Floor Panel Carpet Replacement in Interior Trim.

Disconnect the washer hose connection (1) from the body harness (2) at the endgate. Remove the air cleaner assembly. Refer to Air Cleaner Assembly Replacement in Engine Controls.
Disconnect the hose (1) from the rear washer pump. Install a plug to the rear washer pump nozzle to prevent washer fluid loss. Push the hose grommet (2) in through the bulkhead.
Pull the washer hose (1) into the vehicle though the bulkhead. Cut the old washer hose off where it enters the body wiring harness (2). Remove the hose end from the vehicle
Or it could be the pump , they go bad . switch the hoses from one pump to the other an see if you get washer fluid at the back ,if you do the pump is bad ,if not the hose or the spray nozzle is clogged . You probably will need to pull the washer fluid bottle to see both pumps

It is located behind the right rear quarter panel , In the back right of the interior !
Remove the right rear quarter trim panel. Refer to Rear Quarter Trim Panel Replacement - Right Side in Interior Trim.
Removal Procedure

1. Remove the rear seat. Refer to Rear Number 2 Seat Replacement or Rear Number 2 50-50 Seat Replacement in Seats.
2. Remove the Third Pillar trim panel. Refer to Third Pillar Trim Replacement .
3. Remove the garnish molding. Refer to Body Rear Corner Garnish Molding Replacement .
4. Remove the door sill plate. Refer to Liftgate Door Sill Plate Replacement .
5. Remove the quarter panel trim screws.

A lot involved in this but not to difficult !

1. Remove the rear door sill trim plate. Refer to Front Side Door Sill Plate Replacement or to Rear Side Door Sill Plate Replacement .
2. Remove the lower rear seat belt cover and bolt.
3. Remove the trim panel from the vehicle.

Remove the sill plate. Firmly pull the sill plate up and out from the retainers.
Remove the sill plate from the vehicle. Start from the front of the door sill. Use a flat-bladed tool in order to pry the door sill plate.
Rear Side Door Sill Trim Plate Replacement
Use a flat-bladed tool in order to pry the door sill plate. Remove the sill plate from the vehicle.
Body Rear Corner Garnish Molding Replacement
Remove the rear upper garnish molding. Refer to Rear Upper Garnish Molding Replacement .
Pull down on the upper corners of the garnish molding in order to disengage the retaining clips. Pull in order to disengage the remaining retaining clips. Remove the rear corner garnish molding from the vehicle. Inspect the rear corner garnish molding for broken or missing retaining clips. Replace the retaining clips as needed.
Good Luck ! Fun job !!!!!

There may not be enough room under the door plates. I suggest you lay the cable under the carpet next to the door sill.

Not uncommon, the master window switch on the driver's door goes wonky. Mine had same problem (2003 1500 4.7L long cab) and simply replacing the master switch fixed both bad passenger switch intermittent problems. Easy swap, cheap at the dealer.

Front seating area, passenger side, behind dash, above blower motor, mounted on firewall

This is usually a case of a broken wire in the driver's side door sill, on the New Body Style 2004 ( not a lightning or Heritage ).

Pop the door sill cover up, and you are looking for a purple or blue w/ white stripe wire where 3 wires are spliced. The splice tape looks like hockey tape, so water can still get in.

Here are 2 pictures of the broken wire locations

It is the door lock actuator and its real easy their are a few cover plates on trim remove and take out the srews then take off the interior mirror cover / then take the door panel lift upwards and out the after you get the trim panel off the latch has three bolts on outer take those out and disconnect rods be careful they dont break and just reverse it to put it back together