1. The Obvious First Steps:
* Check the fuses: Locate your owner's manual to find the fuse box diagram. The wiper motor usually has its own fuse, and sometimes a separate fuse for the intermittent wiper function. Check these fuses for any blown elements (broken filament). Replace any blown fuses with the correct amperage. Don't just replace with a higher amperage fuse, as this could cause further damage.
* Check the wiper switch: Make sure the wiper switch itself isn't faulty. Try all the settings (low, high, intermittent). A malfunctioning switch is a common culprit. If other switch functions (like washer fluid) work, the switch itself might be partially broken (a common point of failure in older cars).
* Check the wiper fluid reservoir: Make sure you actually have windshield washer fluid. While this won't directly affect wiper *motor* function, a low fluid level might trigger a sensor that inhibits the wipers.
2. More Involved Troubleshooting (Requires some mechanical ability):
* Check the wiper motor: This is often the next point of failure. Accessing the motor will vary depending on the year of your Rodeo. You'll likely need to remove some trim pieces to reach it (usually under the hood, but sometimes beneath the dash). Once accessed, you can:
* Visually inspect: Look for any obvious damage to the motor or wiring.
* Test for power: With the ignition on and the wipers switched on, use a multimeter to check for power at the motor's connector. If no power is present, trace the wiring back toward the fuse box and switch.
* Test the motor directly: You can carefully apply 12V power directly to the motor terminals (using your multimeter leads). If the motor doesn't run, it's likely bad and needs replacement.
* Check the wiper linkage: This is the mechanical system connecting the motor to the wiper arms. It could be broken, seized, or disconnected. Again, this involves removing some trim to access the linkage. Inspect for:
* Broken parts: Look for any obvious cracks or breaks in the linkage arms or connecting rods.
* Seized components: Try to manually move the wiper arms. If they're stiff or won't move freely, the linkage may be seized due to rust or corrosion. Lubrication might help, but often replacement is needed.
* Disconnections: Make sure all the parts of the linkage are securely connected.
* Check the wiper motor ground: A poor ground connection can also prevent the motor from functioning. This usually involves cleaning the ground wire connection points to ensure good electrical contact.
3. If you lack mechanical experience:
If you're not comfortable working on your car, it's best to take it to a qualified mechanic. They have the tools and experience to diagnose and repair the problem efficiently.
Remember to consult your Isuzu Rodeo's repair manual for specific instructions on accessing components and troubleshooting your particular model year. The location of fuses, the wiper motor, and the linkage can vary slightly between model years.
