On my 1999 rodeo, when I hit the switch for the rear wiper, a clicking sound comes from the dash on the far right side under the right-most vent and next to the speaker in the door panel. That clicking noise is presumably the relay switching on and off, but God help you if you want to access it.
A relay under the dash that controls the wiper has probably died. This is a common failure for Isuzu trucks. You can find bits of advice on the web on repairing the relay board, but unless you are a serious do it your selfer, you will have to go to your dealer to get this fixed.
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If the rear wiper on a 2001 Isuzu Rodeo will not turn off it could mean that the rear wiper switch is broken. The cost to replace the switch averages around $200 if done by a professional mechanic.
Lift the wiper and turn the wiper to a t position and there is a clip that you squeeze together and it lifts off
At Walmart! :-)
Tom's Truck parts 800-338-9232
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The fluid not spraying could be a clogged line or disconnected line or bad windshield washer motor. The rear wiper not working could be a bad wiper motor in the rear or unhooked linkage or fuse or relay. Check the fuses etc first.
You are probably going to have to replace the wiper arm. Go to a good salvage yard and get one off a decent looking wreck.
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The 2000 Isuzu Rodeo has the most common hook-end wiper arms. See sources and related links below for installation videos. Also, purchase the replacement blades first and there will be additional instructions/illustrations on the replacement packages. Locate and press the tab or button where the wiper blade is inserted into the hook of the wiper arm and pull wiper blade out of hook. You may have to rotate and flex the blade to make enough clearance for the hook to pass through.