1. Fluid Level:
* Check the washer fluid reservoir. Is it empty? This is the most obvious and simplest reason. Top it off with the correct washer fluid.
2. Pump Issues:
* Listen for the pump. When you activate the rear washer, do you hear the pump whirring? If not, the pump itself might be faulty, clogged, or has a blown fuse.
* Pump location: The location of the pump varies by vehicle. It's often located under the hood, sometimes near the reservoir. Consult your owner's manual for its location.
3. Wiring and Fuses:
* Check the fuse. Your owner's manual will show you where the fuse box is and which fuse controls the rear washer. A blown fuse is a common cause. Replace it with a fuse of the same amperage.
* Wiring issues: A broken or corroded wire in the circuit can also prevent the pump from working. This is harder to diagnose and may require professional help.
4. Hose Clogging or Leaks:
* Clogged nozzle: The nozzle itself might be clogged with dirt or debris. Try cleaning it with a needle or compressed air.
* Frozen hose: In cold weather, the hose can freeze, blocking fluid flow. Let it thaw out.
* Leaking hose: A leak in the hose anywhere between the pump and the nozzle will prevent fluid from reaching the nozzle. This requires visual inspection of the hose.
5. Switch Problems:
* Faulty switch: The switch itself might be broken. This is less common, but possible.
6. Relay Problems:
* Relay malfunction: Some vehicles use a relay to control the washer pump. A faulty relay will prevent the pump from operating. Check the owner's manual for its location.
Troubleshooting Steps:
1. Start with the easiest: Check the fluid level first.
2. Listen for the pump: Does it activate when you use the switch?
3. Check the fuse: This is a quick and easy check.
4. Inspect the nozzle: Clean it if it's dirty or clogged.
5. Check hoses for leaks or blockages: This may require some visual inspection under the vehicle.
If you've checked all these and the rear washer still doesn't work, you'll likely need to take your vehicle to a mechanic for professional diagnosis and repair. Providing your vehicle's make, model, and year will help in more specific troubleshooting.
