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Re: 99 cherokee sport drivers side power window master...
Pull back the rubber boot that covers the wire harness that passes through the door jam. Most likely you will find a broken wire there, it is a very common problem with this vehicle.
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It has to be the switch or the wiring, right? So pull out the switch and probe the back with a volt meter to see if power is coming out of the switch. If yes, trace the wires to the doors.
If there is power to the switch, the switch is the point of failure. You can verify by checking for power at the window motors when the switch is pressed. It is also possible that there is a faulty ground connection from the switch, but this is unlikely. 99% chance replacing the switch assy. will solve the problem.
Hi,your problem lies where the wires go from the car body to the door on the drivers door. If you open the door and take the kick panel off and pull on the wires that goes to the door quite hard and see if one of the wires are broken normally it is the earth the thick black one.
I WOULD CHECK THE WIRING BETWEEN THE DRIVER'S DOOR AND THE POST..YOU WILL SEE A RUBBER BOOT BETWEEN DOOR POST AND DOOR..HAVE SEEN PARTIALLY BROKEN WIRES CAUSE ALL SORTS OF PROBLEMS HERE
Likely you are looking for a 30 amp circuit breaker...(Looks like a small rectangular metal fuse) But...if the power door locks work, i don't think that it's bad (serves locks & windows) My diagrams show a bunch of diodes and resistors inside the master (drivers) door switch, but I've had a few apart and never saw any. (embedded?) Personally I don't see anything that shows me reliability built into the switch...It's a really "iffy" design (one in my niece's Jeep only works when the sun shines on the drivers door) There is also a control module associated with the windows but I've never needed to replace one and the manuals never tell you where they are! Check power at the switch and check harness where it goes through the rubber boot between the door and body. at least 80% of problems I've seen are either the switch or that wiring. Wires can be spliced and you can get a decent used switch at most scrap yards. Good luck...glad they aren't stuck down!!!
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