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possible cause would be broken door wires in the harness between the door and the body on the driver side , also another problem could be the bcm ( body control module ) some times these can be flashed or reprogramed at the dealer with new software .
The wire that provides power to your door is split in half. This is caused by normal usage and results in lose of power when the door opens or closes and causes wire to twist which splits the two ends resulting in lose of power in only one location. You can fix it by following the post by "grimmster" and "lane" on the following web forum (scroll to the middle of the forum to see their solution). This should only cost $10 bucks (need electrical tape; soldering iron and wire from Home Depot) rather than hundreds at the dealer:
You will need to replace the motor/regulator assembly. Your local parts store should carry them or order online. These should be in stock as this is a common problem. Removing the motor bolts will be a pain since they have a rubberized nut hold them in the rear. Try a vise grip on them or if all else fails pull on the motor and pop them out. The replacement assembly uses normal nuts. Pay close attention on how the old assembly bolts up (take a picture before you remove it) since you will have to move the assembly to wrestle it out of the door. Reinstall assembly and check operation before you put door panel back on.
Shouldn't set off air bag if you are taking off door panel. You could always disconnect negative battery cable to be extra careful. I have replaced both passenger and drivers windows with battery connected. Take your time in removing door panel so avoid breaking plastic retaining clips.
One nasty part of this job is removing bolts that hold window motor to the door. They have a rubberized nut on the backside. Sometimes you can hold them with vise grips. I've found if I just pull the motor really hard the bolt and nut slides out of rubber guide.
It is also a little tricky to remove the unit and reinstall it in the door. Just be patient and take your time.
One tip is to leave the door panel off after you install the new door motor/regulator unit. Simply plug in the window switch and make sure all is functioning correctly and then install door panel.
I buy the replacement window units online and save big bucks over the dealer.
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