1. The Obvious:
* Fuse: Check the rear wiper fuse in the fuse box (usually under the hood or inside the passenger compartment). Consult your owner's manual for the correct fuse location and amperage. A blown fuse is the most common and easiest fix.
* Wiper Switch: Try the rear wiper switch multiple times. It could be faulty or simply stuck.
* Fluid: Make sure you have sufficient washer fluid in the reservoir. A dry wiper blade will easily damage the wiper and will not work effectively.
2. More Involved Issues:
* Wiper Motor: The motor itself could be faulty. This requires accessing the motor (usually located under the rear cargo area) and testing it for power and operation. You'll likely need a multimeter to check for voltage at the motor's connector.
* Wiring: A break or short in the wiring harness leading to the motor is possible. This can be difficult to diagnose and may require tracing the wires from the switch to the motor. Corrosion at connectors is a common culprit.
* Wiper Linkage: The mechanical linkage connecting the motor to the wiper arm could be broken, jammed, or disconnected. Inspect visually for any obvious damage or displacement.
* Wiper Blade: A severely worn or damaged wiper blade might not make proper contact with the glass, or it may be frozen to the glass. Replace the blade as needed.
* Ground: A poor ground connection can prevent the motor from working. Check the ground wire for corrosion or breakage.
Troubleshooting Steps:
1. Start with the simplest checks: Fuse, fluid, switch, and wiper blade.
2. Check for power at the motor connector: If the fuse is good and the switch works, use a multimeter to check for voltage at the motor's connector when the rear wiper is activated. No voltage indicates a wiring or switch problem. Voltage indicates a motor problem.
3. Visual inspection: Carefully examine the wiper linkage, wiring harness, and motor for any obvious damage.
4. Professional help: If you're not comfortable with electrical or mechanical work, take it to a mechanic. Diagnosing a faulty rear wiper can be time-consuming without the right tools and expertise.
Remember safety first when working with electrical components. Disconnect the negative battery terminal before starting any electrical troubleshooting.
