if fuse hasn't blown, pull your tailgate trim and check at the relay for power with a test light at terminal 30 on relay plug (this is the power for the motor).
if it's there, have someone push the switch and see if you're getting power to terminal 85 on the plug (this is the power into the relay from the switch). ifit's there, verify continuity to ground from terminals 86 and 87a- if it's there, you've quite probably got a bad motor.
oops- forgot to include: verify power at terminal 87 (not 87a) with switch "on" and plug connected (output to motor)
good luck- and once it's working have fun driving around without the wiper arm installed spraying tailgaters with the washer! it looks like your Jeep is peeing if you spray it while sitting still (marking it's territory)
--Shorty:sure: