How to take off a rear door panel?

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

1) Front End Sensor - Right--Located under the front hood in the engine compartment (2) I/P Air Bag--Located at the top right under the instrument panel (3) Roof Rail Air Bag - Right--Located under the headliner, extending from the passenger front windshield pillar to the passenger rear windshield pillar (4) Side Impact Sensor (SIS) - RF--Located under the right front door trim near the lower rear of the door frame (5) Sensing and Diagnostic Module (SDM)--Located underneath the vehicle carpet under the center console (6) Seat Belt Pretensioner - RF--Located under the trim near the bottom of the center pillar (7) Side Impact Sensor (SIS) - RR--Located under the right rear door trim near the lower rear of the door frame (8) Roof Rail Module - Right--Located behind the garnish molding on the upper rear pillar (9) Roof Rail Module - Left--Located behind garnish molding on the upper rear pillar (10) Side Impact Sensor (SIS) - LR--Located under the left rear door trim near the lower rear of the door frame (11) Seat Belt Pretensioner - LF--Located under the trim near the bottom of the center pillar (12) Side Impact Sensor (SIS) - LF--Located under the left front door trim near the lower rear of the door frame (13) Roof Rail Air Bag - Left--Located under the headliner, extending from the driver front windshield pillar to the driver rear windshield pillar (14) Steering Wheel Air Bag--Located on the steering wheel (15) Vehicle Battery--Located at the front left of the engine compartment. (16) Front End Sensor - Left--Located under the front hood in the engine compartment

For the XL - The AMP is located on the drivers side, behind the left rear trim panel.

1. Remove the cargo shelf. 2. Tumble the third row seats to the cargo position. 3. Remove the left body side window rear garnish molding.4. 4. Remove the left body side window forward garnish molding. 5. Remove the liftgate sill plate. 6. Remove the left rear door sill panel. 7. Remove the lower seat belt anchor bolt. 8. Remove the auxiliary power outlet from the trim panel. Release the five screws that retain the rear quarter trim panel to the body. 9. Remove the rear quarter trim panel from the vehicle.

If you don't have the XL then the AMP is located on the passenger side.
1. Remove the screw that retains the trim panel to the body. 2. Remove the cargo net retaining knobs. 3. Remove the bolt that retains the seat belt upper guide to the body. 4. Remove the rear upper quarter trim panel from the vehicle. 5. Remove the cargo shade/cover. 6. Remove the inflator access panel. 7. Remove the right rear quarter upper trim panel. 8. Remove the liftgate sill plate. 9. Remove the right rear door sill panel. 10. Remove the lower seat belt anchor bolt. 11. Release the retaining clips that retain the trim panel to the body. 12. Partially remove the trim panel in order to remove the inflator switch from the inflator bezel. 13. Remove the auxiliary air outlet washer and retaining nut. 14. Feed the auxiliary air outlet through the inflator bezel. 15. Remove the inflator bezel from the trim panel. 16. Disconnect the the 12-volt power supply electrical connector. 17. Remove the 12-volt power supply. . 18. Remove the trim panel from the vehicle. 19. Disconnect the electrical connectors from the radio speaker amplifier. 20. Remove the 4 bolts that retain the radio speaker amplifier to the body. 21. Remove the radio speaker amplifier from the body.

Constant 12V+ Orange Switched 12V+ Yellow Ground Black Illumination Gray Dimmer Brown Antenna Trigger Pink Antenna Right Rear Front Speakers 6 1/2" Doors Left Front (+) Tan Left Front (-) Gray Right Front (+) Light Green Right Front (-) Dark Green Rear Speakers 6 1/2" Side Panels Left Rear (+) Brown Left Rear (-) Yellow Right Rear (+) Dark Blue Right Rear (-) Light Blue

go to lmc trucks .comthey have panel to fix it

Constant 12V+ Brown/White
Switched 12V+ Orange
Ground Black/Light Green
Illumination Pink/Black
Dimmer Pink
Front Speakers 5" x 7" Doors
Left Front (+) Gray/Blue
Left Front (-) Yellow/Blue
Right Front (+) Blue
Right Front (-) Yellow
Rear Speakers 5" x 7" Side Panels

Left Rear (+) Blue/White
Left Rear (-) Blue/White
Right Rear (+) Blue/Black
Right Rear (-) Red/Blue

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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. Then you'll need to manipulate the panel and disconnect the door handle linkage from the door handle and disconnect the wiring for your controls. Then you can access the bolts that secure the mirror onto the door

Snap out two door pull strap retaining screw covers. Remove screws.
Remove screws on front, rear and center of front door trim panel.
Using the Trim Pad Removing Tool or equivalent, pry the trim panel retaining clips from the door inner panel.
These are plastic so be careful you can use a pair of needle nose pliers if you don't have a trim tool.Just start at bottom of door panel and work your way around and up.

stupid question but did you try inside latch?If so you should be able to remove seat from other side and remove door panel and replace parts (probley clip) as needed or at least open door if latch is defective