Take door panel off a 1990 Mazda Protege passenger side.

SOURCE: passenger side mirror, power, 2003 mazda Protege needs replaced

you need to remove plastic panel inside the door then you will find wireing plug undo and three bolts
to undo mirror ok m8

SOURCE: left front door auto lock-unlock only buzzes. How remove door?

thei are screws in the door hidden by caps that you need to take off the door and near the mirror shoud pop off

SOURCE: 2003 mazda protege, power door locks.

yes you do the ones in question/ Please rate my response thank you very much

SOURCE: Mazda 5 replacing external handle on sliding door

Your door should be held on with clips. Removing the panel is sometimes hard, just take a good WIDE flat head screwdriver, and whatever tool needed to remove the screws holding the panel on, and be careful. Check underneath the panel, by the inside handle, and the arm point for screws. Once removed, take your WIDE screw driver, and don't quite pry them off, more or less try to get it underneath and pull towards yourself. There is no real easy way, just try to be patient with it, and if you hit any binds, look for more screws, its just a matter of patience for sure.