The passenger window of my Buick Lesabre 2000 recently broke. How can I uncover the door to access to the mechanism, and what part should I replace?

PWR WDO - 30amp circuit breaker , DRV -MDL 10amp fuse - both are located in the rear fuse box .
Fuse Block Rear
Under the left side of the rear passenger compartment seat

Remove interior door panels and unbolt the window mechanisms. It should be obvous once you ahve the panels off. Study online how to reove the door panels.

check the harness from the a pillar to the door could have shorted out

Usually a blend door problem.
Doors under the dash direct air thru the system.

hi there may be relays mounted inside the door frames u have remove door panels 2 get 2 them

check out compnine.com 4 diagram n parts

There is a door actuator motor not working,the dash has to be removed to access the actuator motor,if this was helpful,at all,please rate,thank you.

If you know you have power going to the door window motor. And it is not working then most likely the motor is bad.
But to be safe listen motor is running try going up & down. Some years of Buick came with belt drive and yours may have broke

I had the same problem on my 1992 lesabre. The solution is to test the window motor itself with an external 12 volt power supply ( I used the car battery and some jumper cable w/ 2 screw drivers - not recommended for amatures! LOL) First remove the door panel which is difficult but you'll figure it out if you are qualiifed to repair your window yourself. Then test the window moptor if it functions (in both directions) THEN IT IS THE WINDOW SWITCH, A FUSE OR A RELAY. If the moter does not function then replace the motor
Good Luck
You can get a new window motor on ebay or at your local junk yard or (god forbid) the dealership