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The rear wiper motor is separate from the front one. That is right behind the back door panel at pivot point. Your wiper motor and pump for your front washer fluid is under the grill below your pivot points on the front wipers.
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
on my chevy blazer there are 2 pumps in the front resivior one goes to the rear wiper and the other goes to the windshield if you have 2 pumps one might be bad. there could also be something plugged in the hose. on my blazer the upper pump goes to the rear wiper. hope this helps.
Yes there are two pumps located in the wiper fluid reservoir. If your in a bind, you can switch the plugs and small hose that go to them because they are both the same. The upper pump operates the back, and the lower pump operates the front. The back won't work until it gets replaced, but it beats driving backwards.
your rear wiper motor might be faulty,in the front i would check your fluid level-if it is full and you hear the pump running-check your washer lines to see if they are pinched-usually around where the hood closes