Is there a way to move a broken power seat manually?
Only after you get the seat out and the track motor off.
This will let you move the seat, but there will not be anyway to stop it in any position. It will just slide back and forth. I would troubleshoot the cause. could be blown fuse, bad switch or motor, or bad wire. Not to hard to isolate. The car is seven years old so it shouldn't be hard to find a part in a junk yard.
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