91 4 runner tailgate, window wont open

If a tailgate won't open and you need to get to the mechanism inside the panel must be removed by whatever means are available, even if it means destroying the panel and removing it in pieces - fortunately the few I have tackled, the panel was flexible enough to remove with minimal damage.
In those cases the tailgates had an electric release and one had a defective switch and the others had broken wiring where the harness jumps from the body to tailgate.

Check the wiring harness from the tailgate to the body. It may be loose or damaged.

check the fuse/relay. if it is neither of these check the switch with a multimeter. If you can hear the motor trying to move the glass when you try the switch it may be the regulator needs attention. It may be the motor needs to be replaced.

check fuse and relay along with the switch first then the regulator and motor afterwards. Replacing the small electronics is obviously easier than having to open up the tailgate to check the mechanics of the winedow.

Very typical for the window motor to fail. The tailgate will not open when the window isn't rolled down. If there is voltage to the terminals of the window motor when you actuate the switch but the motor does not turn, replace the motor. Once you are able to roll the window down, the tailgate should open again.

check the top runner on the tailgate on the outside to see if damaged. if not that then check the molds around the gate

check wiring fuse and pos relay from dash switch

it sounds like the window regulator

hi phil, dont know if it will be of help but we had this problem ,try making sure rear wiper blade is in the proper resting place,i know it sounds to simple but it was our solution in the end after a machanic spent hours and hours on our 94 surf plus££££s, hope this is your answer, good luck. regards Reg

you could run a 3 way switch of some kind. but i would try looking in the access panel and finding the safety switch either right on the bottom of the handle or the drivers side tailgate latch. they are known to go bad.you can replace it but i pulled mine out and jumped it with a piece of wire works fine now

The rear window has to be completely down in order to move the tailgate! You should be happy that your window is stuck up, unlike mine which is stuck all the way down! I have to completly take apart my tailgate!! If you want to try a trick to get the rear window down, my bronco has a rear window switch right next to the headlight knob, take the 2 purple wires on that window switch, and cross them, if your motor still works and if the wires are good, that should make the window go down!!! good luck, hope that helps!