* Worn-out wiper blade: A worn or damaged blade can't effectively clear the entire window, and can even cause it to skip or jump. Replace it with a new blade specifically designed for your vehicle's rear wiper arm.
* Dirty or jammed wiper arm: Dirt, grime, or ice can build up and prevent the arm from moving freely. Clean the arm and its pivot point thoroughly. Check for any obstructions that might be hindering its movement.
* Faulty wiper motor: The motor itself might be weak, failing, or completely dead. This is a more serious issue and often requires replacement. You'll likely hear unusual noises (grinding, clicking) if this is the case.
* Broken or disconnected linkage: The linkage connects the motor to the wiper arm. A broken or dislodged part in this system will prevent proper movement. This often requires disassembly to inspect and repair or replace.
* Electrical issues: A blown fuse, faulty switch, or wiring problem can prevent power from reaching the motor. Check your vehicle's fuse box for a blown fuse related to the rear wiper.
* Worn wiper transmission: Some rear wipers use a small gear mechanism to drive the wiper arm. This can wear out, causing intermittent or incorrect operation. Repair or replacement is usually necessary.
Troubleshooting Steps:
1. Visual Inspection: Start by visually inspecting the entire rear wiper system. Look for any obvious damage, loose connections, or obstructions. Pay close attention to the wiper blade, arm, linkage, and motor.
2. Wiper Blade Replacement: This is the easiest and cheapest fix to try first. A new blade is readily available at most auto parts stores.
3. Cleaning: Thoroughly clean the wiper arm and its pivot point. Use a degreaser if necessary.
4. Check the Fuse: Consult your owner's manual to locate the fuse for the rear wiper motor and check if it's blown. Replace it if needed.
5. Listen for the Motor: When you turn on the rear wiper, can you hear the motor running? If not, the motor itself might be faulty.
6. Test the Switch: Try the rear wiper switch multiple times. If it's intermittent, the switch itself could be the problem.
If you're not comfortable working on the car yourself: Take it to a mechanic or auto repair shop. They can diagnose the problem accurately and perform the necessary repairs. Describing the specific symptoms (only cleaning one section, not returning to rest) will help them pinpoint the cause more quickly.
