That simple little bar and cable thing still works, so that should tell you that the problem is likely with some thing else. It either works or its doesn't. Look for frayed cable/wires, in the mechanism,
then see if the bolts that tighten the window to it are loose or missing. After that, it's about looking at your rubber seals and all the other stuff up there that guides the windows into place. Compare dr, side to pass, side if you have to. Theres not alot that can go wrong with this system, just replaced one myself (due to frayed, broken cable ). Toughest part is taking the door panel off and getting to all that stuff.
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Domesticon Prime

93' LE V-6, 303K Km., fully optioned including Leather Interior. ES300 rear discs, twin piston front calipers, Depo Chromes with HID projectors, 17" OZ' summer's, 96 corner lights, MAF, timing, exhaust and intake mods, 2001 Toyota/JBL sound, + more and always more coming.