The window regulator is most likely your problem. Some have a plastic track that the teeth get chewed up and the gear can't drive it anymore. I believe the regulator comes as a unit, including the motor and all.
Disconnect and isolate the battery negative cable.
Remove the rear wiper arm from the rear wiper motor output shaft.
Using a small thin-bladed tool, gently pry at the notch in the base of the rear wiper motor output shaft bezel to unsnap the nut cover from the bezel .Be certain to take proper precautions to protect the outer tailgate panel and its paint finish from damage during this procedure.
Remove the nut that secures the rear wiper motor output shaft to the outer swing gate panel
Remove the bezel and gasket from the rear wiper motor output shaft.
Remove the trim panel from the tailgate inner panel.
Disconnect the tailgate wire harness connector for the flip-up glass ajar switch from the flip-up glass latch connector receptacle.
Disconnect the tailgate wire harness connector for the rear wiper motor from the motor connector receptacle
Loosen the two screws that secure the rear wiper motor mounting bracket to the top of the tailgate inner panel.
Slide the rear wiper motor and mounting bracket forward far enough to disengage the two mounting screws from the keyed slots in the top of the tailgate inner panel.
Remove the rear wiper motor and mounting bracket from the tailgate as a unit.
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There's this website www.reliable-store.com
They have books on ALL vehicles.
it covers wiring diagrams, electrical diagrams,
fuse diagram, torque specs, PCV, error codes, fault codes, service info, repair info, parts info, troubleshooting owner's/service/repair/parts/maintenance manuals
etc everything totally..
I have 1987 toyota 4runner model and I keep servicing and when needed repair it on my own. worth it !!!
The rear wiper has its own pump motor. pull the hose from the wiper and have someone engage to see if there is a clog. do the same at the motor. if bo liquid comes out then its the pump. also check fluid level in reservoir as well as a possible secondary reservoir
Disconnect and isolate the battery negative cable.
Remove the rear wiper arm from the rear wiper motor output shaft.
Using a small thin-bladed tool, gently pry at the notch in the base of the rear wiper motor output shaft bezel to unsnap the nut cover from the bezel .Be certain to take proper precautions to protect the outer tailgate panel and its paint finish from damage during this procedure.
Remove the nut that secures the rear wiper motor output shaft to the outer swing gate panel
Remove the bezel and gasket from the rear wiper motor output shaft.
Remove the trim panel from the tailgate inner panel.
Disconnect the tailgate wire harness connector for the flip-up glass ajar switch from the flip-up glass latch connector receptacle.
Disconnect the tailgate wire harness connector for the rear wiper motor from the motor connector receptacle
Loosen the two screws that secure the rear wiper motor mounting bracket to the top of the tailgate inner panel.
Slide the rear wiper motor and mounting bracket forward far enough to disengage the two mounting screws from the keyed slots in the top of the tailgate inner panel.
Remove the rear wiper motor and mounting bracket from the tailgate as a unit.
first check fuses if all good remove back hatch panel find wiper motor remove plug . turn the ignition key to on position turn on rear wiper now test wiper plug for power if no power replace wiper motor
Spider gears are not difficult to replace...however, if they are worn, usually this contaminates the lube and can cause damage to carrier as well as pinion bearings...Those require precise settings with special tools and lots of experience to replace. Since you have had the noise for a long time, I can safely assume that debris has been building all that time. Spider gear set is not cheap...You may want to risk doing the job, but I would likely find another exact match, drum to drum replacement in a scrapyard. Generally I will only recommend a spider gear replacement if you have snapped a gear in half...an immediate failure does not generate the kind of fine metal that wear does.
If there is a separate switch for the rear wiper there might be a separate fuse. Check to see if your rear window cleaner works. If it doesn't check your fuse. If it does work i suggest that you replace the switch or check the connections of the switch. I hope this helps.
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