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you can by pass the switch, get wiring diagram and figuare out wich wires are for window motor you need rolled up, then remove switch and put power to wire that will make motor roll window up
Run a hot (12 Volt) wire straight to the motor with a jumper to the wire that allows up. Be careful as you can get hurt doing this.
look for the wires that go to the driver window switch, there will be 3, two of them will make window go up, 2 will make window go down. use a small jumper wire to brige them
Make sure you have the power connected to the switch, by taking a flat head screw driver and pop the whole plated that hold the buttons and make sure it's connected. ========== In my 1990, I had a broken power wire in between the door and the door mounts. Open your door and look for an accordion-like black wire protector. Remove it and check the now revealed window wire harness. The black wire is a power jumper that goes to all window up, down, on and off switches. Volvos are notorious for corroded wires and casings.
You must use a 12 volt power supply(I.e battery charger) to "hot wire" wires going to motor. If possible, unplug the wires going in to motor and jump the terminals. If plug is not accessible you may need to carefully shave insulation off wire to expose a contact point. If the window doesn't move at first, remember its d/c. Switching the hot and ground will run the window in opposite directions.
wire lose? bad motor if its power. could be a number of things. do you hear the motor if it is a power window?
Run a wire from the POSITIVE terminal on the battery and touch the red wire (positive) to the window motor and run another wire from the NEGATIVE terminal on the battery and touch the green wire (negative) to the window motor. The window should go down. Reverse the wires to make the window go up.
Run a wire from the POSITIVE terminal on the battery and touch the red wire (positive) to the window motor and run another wire from the NEGATIVE terminal on the battery and touch the green wire (negative) to the window motor. The window should go down. Reverse the wires to make the window go up.
Run another dedicated hot wire to the drivers window switch. This will provide power to that window no matter if the driver cuts the power or not.
A jumper wire should use to bridge electrical ground across?
take the door panel off and disconect the wire assembly or window regulator that goes to the power window moter and manually pull the window up.
Reset the left rear door power window by removing the power window motor and connect both the motor and the power window switch to the vehicle's wire harness. Turn the ignition switch on and it should be able to reset.