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If the motor runs as you push the switch and keeps running till you stop the drive in the motor or the regulater has broken. You can try to manully close the window and then push the switch to see if it'll ingage. Opening the door by removing the door panel, work the switch to see what's not working. If you haven't worked on the interanl or car doors before at least get a manul to see the procedure and refer to the pictures as you can break it still further or hurt yourself inside the door.. Auto parts stores online sales catalogs will show you what the parts look like and how much they cost. Many Volvo's aren't covered very well at parts stores and you may have to get replacemnt patys on ebay to get a reasonable price. wreaking yards are spotty as these days they have to crush cars soon after they get them per enviromental laws.
the glass channels are dry, get a can of silicone spray lube from the auto parts store and spray it into the glass channels until it runs out the botton drain of the door, cover platic parts with a rag as the silicone can discolor them, run the window up and down to ditribute the lube, this should cure the problem
Pull off door panel and jump power to motor to test. If it doesnt work you bought the right part. Then disconnect motor and work regulator up by hand then wedge regulator in spots to keep glass up till part arrives.
sounds like the lock lach is dry or rusted solid time to take the door skin off or roll window down insert straw from wd40 roll window up and spray the chit out of it unload on the inside of the door and dont be afraid to use 1/2 a can it will run out the botom of the door but it should free the lock once it works re spray the lock with lithium grease inside and out it wll help the lock keep working longer
Remove the door panel and find the window motor
Unplug it and using a separate car battery run cables directly to the window motor
When you switch the polarity the motor will either bring the window up or down or if noting happened change the window motor and window regulator assembly.
look up schematics for the auto lock system for your model.
get a highlighter.
trace the lines from the actual lock motor to the PCM (powertrain control module) note all objects you come into contact with when using the highlighter. the circuit should not be that complicated. if you are not familiar with circuits, find someone who is.
write them down. the components.
take your findings to your nearest, knowledgeable, experienced technician and get him to test each component. you will find your problem.
the window problem, i would go right to the motor. it sounds like your are getting a short to ground somewhere in the motor, or near it. take the door panel off and look at the motor for anything abnormal.