I would suggest you reiview some of the old threads on this subject. This is probably THE most often complained about problem in this fantastic vehicle.

I had the same problem with the passenger side not working...I removed the door panel and the plastic seal(looks like a sheet off a "leaf Glad bag") that will give you a peek as to what your problem is...

If it is like mine....the Plastic Supprt Tabs that grip and stabalize the window panel broke..

I simply removed the , "Tabs" enough to "reglue" with a compound called "weld it"...and its been bullet-proof perfect for past 2 years....I did some other stuff too but only because I screwed up and ended up having to take out the window lift assembly....thank god this isn't my day yob!!!!......But...da..daaaa!!!....I got all the wires(cables) and do-hickey's reassembled and the whole damn thing worked!!!!....that time I amazed myself!! ;oog;

PS.... it's a Mickey Mouse repair for sure....but in this case Mickey did a better job than " Mr.Isuzu San" and it doesn't cost U $700 bucks...Please check the old posts and good luck!!