Having a functioning rear windshield wiper is essential for maintaining visibility and safety, especially during adverse weather conditions like rain, snow, or mud. If you notice that your rear wiper is not moving or behaving erratically, it can be frustrating and potentially dangerous. Fortunately, many common issues can be diagnosed and fixed without the need for a professional mechanic. In this guide, we will walk you through the steps to troubleshoot and repair a rear wiper that isn’t working properly, helping you restore clear rear visibility quickly and efficiently.
How to Fix Car Rear Wiper Not Working
Identify the Cause of the Problem
Before attempting any repairs, it’s important to determine why your rear wiper isn’t functioning. Common causes include electrical issues, mechanical failures, or simple obstructions. Here are some steps to identify the root cause:
- Check the Wiper Switch: Ensure the wiper switch is turned on and functioning properly. Test it by toggling it multiple times and listening for sounds or feeling for resistance.
- Inspect the Fuse: Locate the fuse box (usually under the dashboard or in the engine compartment) and check the fuse related to the rear wiper. A blown fuse is a common culprit.
- Assess the Wiper Motor: If the fuse is intact, the motor might be faulty or burnt out. Listen for any sounds when activating the wiper switch.
- Examine the Wiper Arm and Blade: Sometimes, the problem is mechanical—wiper arms may be stuck or damaged, or the blade may be obstructed.
Check and Replace the Fuse
The fuse acts as a safeguard for the electrical system. A blown fuse will prevent the rear wiper from operating. To check and replace the fuse:
- Locate the Fuse Box: Refer to your vehicle’s owner’s manual for the exact location.
- Identify the Correct Fuse: Use the diagram on the fuse box cover or in the manual to find the fuse designated for the rear wiper.
- Inspect the Fuse: Remove the fuse and examine it for a broken filament or burn marks. You can also use a multimeter to check continuity.
- Replace if Necessary: Insert a fuse of the same amperage rating. Do not use a higher-rated fuse, as it can cause electrical damage.
If replacing the fuse restores function, the issue was likely a blown fuse. If the fuse blows again quickly, further electrical diagnosis may be necessary.
Test and Replace the Wiper Motor
If the fuse is intact and the switch seems to work, but the wiper still doesn’t move, the motor might be faulty:
- Listen for the Motor: When activating the rear wiper, listen for a whirring sound from the motor. No sound indicates a potential motor failure.
- Check Electrical Connections: Ensure the wiring to the motor is secure and free from corrosion or damage.
- Test the Motor: If you have electrical testing tools, you can directly supply power to the motor to see if it operates. If it doesn’t, the motor likely needs replacing.
- Replace the Motor: Disconnect the old motor, remove it from its mounting, and install a new one, following your vehicle’s service manual instructions.
Note: Replacing the wiper motor can be complex and may require specific tools. If unsure, consider consulting a professional.
Check and Repair the Wiper Linkage and Arms
Mechanical issues with the linkage or wiper arms can prevent proper movement:
- Inspect the Wiper Arms: Look for loose, bent, or damaged arms. Ensure they are securely attached to the motor shaft.
- Examine the Linkage: The linkage connects the motor to the wiper arms. Check for broken, disconnected, or rusted components.
- Lubricate Moving Parts: Sometimes, stiff or stuck linkages can be freed by applying a suitable lubricant.
- Replace Damaged Parts: If any components are broken or excessively worn, replace them with compatible parts from an auto parts store.
Manual movement of the wiper arms can help identify if there’s an obstruction or mechanical failure. Always ensure the vehicle is off before handling the linkage or arms.
Ensure Proper Wiring and Electrical Connections
Electrical issues such as loose or corroded wiring can cause the rear wiper to malfunction:
- Inspect Wiring Harness: Look for damaged, frayed, or corroded wires connecting the switch, fuse, and motor.
- Secure Connections: Tighten any loose connectors and clean corrosion with electrical contact cleaner.
- Test Continuity: Use a multimeter to ensure wires are conducting electricity properly.
- Replace Damaged Wiring: If wiring is compromised, replace or repair it to restore proper function.
Electrical repairs should be performed with the vehicle off and the battery disconnected for safety.
Check the Wiper Blade and Mounting
Sometimes, the issue isn’t with the motor or electrical system but with the wiper blade or mounting:
- Inspect the Wiper Blade: If the blade is cracked, torn, or stiff, replace it for optimal cleaning and movement.
- Verify Mounting Nut and Arm: Ensure the wiper arm is securely attached to the motor’s spindle. Tighten any loose nuts.
- Check for Obstructions: Remove any debris or obstructions that may hinder movement.
A properly mounted and maintained wiper blade ensures smooth operation and effective wiping.
When to Seek Professional Help
While many rear wiper issues can be fixed with basic troubleshooting, some problems may require expert intervention:
- If the motor is burnt out or electrical wiring is extensively damaged.
- If the linkage is severely broken or rusted beyond simple repair.
- If replacing parts does not resolve the issue after multiple attempts.
In such cases, visiting an auto repair shop ensures safety and proper repair, preventing further damage or safety hazards.
Summary: Key Points to Fix Your Rear Wiper
To recap the essential steps in troubleshooting and fixing a non-working rear wiper:
- Check the fuse and replace if blown.
- Test the rear wiper motor for functionality and replace if faulty.
- Inspect and repair the mechanical linkage and wiper arms for damage or obstructions.
- Ensure all wiring and electrical connections are secure and corrosion-free.
- Replace worn or damaged wiper blades and ensure proper mounting.
- Seek professional assistance if electrical or mechanical issues persist after basic troubleshooting.
By following these steps, you can often restore your rear wiper’s functionality, ensuring clear visibility and safer driving conditions. Regular maintenance and inspections can also help prevent future issues, saving you time and money in the long run.
