My rear wiper for my Isuzu rodeo 2000 suddenly stop work, what could possible be the cause? I have check my fuse and the motor and those are good.

Sure,
fuse, wires, switch and motor.
use a magic tool called a voltmeter, (even $10 at walfart)
got 12vdc to the motor, with wiper on,
yes, then motor is bad.
if not, the work backwards to the place 12vdc shows back up.
the schematic makes this 10 times more easy, use one"?
cab box fuse F15 runs rear motor.

Pull the interior panels and trace the wire loom. Focus on the area where it bends with the hinges. Many vehicles are prone to wire breakage here. If you don't see obvious, broken wires, probe them with a voltmeter as they can sometimes break inside without breaking the insulation.
Once you've found any breaks, reconnect with crimp connectors and wrap with electrical tape to secure everything.
good luck.