first check the wiper fuse to make sure it is good. if it is then you need to replace the motor it should be under the vent panel on the outside of the car under the wiper blades
I had this problem on a 1998 Rodeo and the fuse and motor were fine but the bushings in the mechanical arms that move the wiper mechanisms had worn out. Those "arms" are located just below the windshield and under the vent. Take a good look at their orientation before you remove them as there is only one way they go back in correctly.
there is a problem with your bcm or body control module, have it checked
The last Isuzu Rodeo was in 2004.
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