My 2003 jeep liberty rear window wiper doesn't engage when I push the button. I can hear the motor engage, but the wiper doesn't move?

lost the operators guide?
the 2003 book is not on the jeep board now...
04
http://www.jeep.com/en/owners/manuals/

pdf page 203

quote
REAR WINDOW FEATURES
Rear Window Wiper/Washer
A rotary ring switch on the control lever, located on the
right side of the steering column, controls operation of
the rear wiper/washer function. Rotating the center of
the switch up to the DEL (Delay) position or the ON
position will activate the wiper. Rotating the switch ring
beyond the ON or OFF position will activate the rear
washer. The wash pump will continue to operate as long
as the lever or ring is engaged. Upon release, the wipers
will cycle three times before returning to the set position.

more on pg 204 for the safety interlocks of wiper rear.

check if the motor is getting 12volt current with a multimeter

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

REMOVAL

1. Disconnect and isolate the battery negative cable.
2. Remove the rear wiper arm from the rear wiper motor output shaft.
3. 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.
4. Remove the nut that secures the rear wiper motor output shaft to the outer swing gate panel
5. Remove the bezel and gasket from the rear wiper motor output shaft.
6. Remove the trim panel from the tailgate inner panel.
7. Disconnect the tailgate wire harness connector for the flip-up glass ajar switch from the flip-up glass latch connector receptacle.
8. Disconnect the tailgate wire harness connector for the rear wiper motor from the motor connector receptacle
9. Loosen the two screws that secure the rear wiper motor mounting bracket to the top of the tailgate inner panel.
10. 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.
11. Remove the rear wiper motor and mounting bracket from the tailgate as a unit.

To Install just reverse steps

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

yes right at the wiper motor.

its the window regulator. not to bad to change. just a couple of screws to remove the door panel. peel the liner back & remove the 6 10mm bolts and uunhook the electrical connector and the window from the regulator. installation is reverse

Motor itself may be going bad, but first check that it has a good ground

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.

the window regulator needs to be replaced