A blown fuse, frozen blade, broken tailgate wiring, or a failed motor are the top reasons a back wiper stops working; start with fuses and ice.
Why this matters: rear visibility is safety. This guide gives you quick checks, a clear troubleshooting path, and repair tips that match how modern hatchbacks and SUVs are built.
Back Wiper Not Working — Quick Checks That Save Time
Quick check: Make sure the rear glass is fully shut. Many cars disable the rear wiper when the hatch or glass isn’t latched. Cycle the hatch, then try the switch again.
Quick check: Look at the blade. If it’s stuck to the glass with ice or packed snow, don’t run the switch. Free it first with the rear defroster and a scraper. Running a frozen wiper can blow the fuse or stress the motor.
Quick check: Test the rear washer. If you hear the pump but nothing sprays, the hose may be off or the nozzle clogged. If nothing happens, the pump, fuse, or wiring may be at fault.
Quick check: Try every wiper speed and the intermittent setting. A dead intermittent speed with low/high still working points to a relay or module issue.
Quick check: Listen near the rear hatch. A humming motor with no arm movement hints at a stripped linkage or a loose arm on its splines. No sound at all pushes you toward fuse, wiring, switch, relay, or the motor itself.
Most Likely Causes By Symptom
Use this table to match what you see to the fastest next step.
| Symptom | Likely Cause | Quick Check |
|---|---|---|
| No movement, no sound | Blown fuse, bad relay, broken tailgate harness, bad switch | Inspect fuse/relay; flex the rubber boot at the hatch and look for cracked wires; test other wiper speeds. |
| Moves then stops mid-sweep | Wiper “park” relay fault, motor wear, icing on glass | Free the blade and glass, then retry; if repeatable, test relay/module. |
| Runs constantly | Relay stuck “on” or control module glitch | Locate the wiper relay and swap with a matching known-good relay, if available. |
| Motor hums, arm doesn’t move | Loose arm on splines, stripped linkage, seized pivot | Remove the cap and nut on the arm, re-seat and torque; check linkage play. |
| Washer sprays but wiper dead | Motor, relay, or wiring fault | Focus on the wiper circuit; verify power and ground at the motor. |
| Wiper works, washer dead | Empty tank, clogged nozzle/hose, bad pump, frozen fluid | Check fluid level and mix; clear nozzle; listen for pump; thaw lines. |
| Works after hatch wiggle | Broken wires in the hatch hinge boot | Gently flex the boot and watch for intermittent operation; inspect for cracked insulation. |
Step-By-Step Troubleshooting Plan
- Free The Blade And Glass — Turn on the rear defroster, lift the arm slightly, and use a scraper to release the rubber from ice. Don’t run the wiper until the blade is free.
- Check The Fuse First — Find the rear wiper/washer fuse in the owner’s manual or fuse cover map. Replace a blown fuse only with the same rating. If it blows again, stop and move to wiring or motor checks. Frozen operation and shorted hatch wiring are common fuse killers.
- Try A Relay Swap — If your fuse layout uses a separate rear wiper relay, swap it with an identical one from a non-critical circuit for a quick A/B test, then swap back. Relay faults can cause “always on,” “no intermittent,” or “dead” behaviors.
- Inspect The Hatch Harness — Open the rear hatch and peel back the rubber boot where the wires bend. Look for cracked insulation or broken conductors. Tailgate harness breaks are a known weak point that can kill the rear wiper and washer together. Repair with solder/heat-shrink or a harness repair kit.
- Test The Motor And Ground — With the switch on, check for 12V at the rear wiper motor connector and a solid ground. Power with no motion points to a worn motor or seized spindle; no power points to the switch, relay, or wiring.
- Re-Seat The Arm — If the motor shaft turns but the arm sits still, remove the plastic cap, snug the nut, and set the arm in the parked position before tightening. Slipped splines cause a “hums but no wipe” symptom.
- Service The Washer Path — Top up fluid, use a winter mix in cold seasons, clear the nozzle with a pin, and check hose joints near the rear pillar and hatch hinge. If the pump is silent, test the pump fuse and the pump itself.
Winter Issues: Frozen Blades, Ice, And Stuck Arms
Quick check: Switch wipers off before you park. Automatic wipers can try to move at start-up and rip frozen blades or pop fuses. Use the defroster and a scraper instead of running dry blades on ice.
Use a proper de-icer or the car’s heaters to thaw the rear glass and free the rubber. Avoid hot water on cold glass. It can crack glass and refreeze into a slick sheet that defeats the wiper.
Stow a winter washer mix that won’t freeze in the lines. Thick slush in the jet starves the rear spray and leaves salt film on the window. Top up before a cold snap and purge the line with a few long sprays.
Washer Sprays But Wiper Won’t Move? Or Sprays Won’t Work?
If the rear washer still sprays, your fuse and switch likely have power. Focus on the motor, relay, arm, or linkage. A motor can hum without sweeping when splines are stripped or the arm clamp is loose; re-seat and tighten the arm nut.
If the spray is the only thing dead, think basic first: fluid level, nozzle clog, frozen mix, or a pinched hose in the hatch hinge area. Listen for the pump. A loud buzz with no spray hints at a disconnected hose. Silence hints at a pump or power problem. Use a pin to clear the jet and verify hose joints near the rear pillar.
Many cars share one reservoir and a two-direction pump that reverses polarity to feed front or rear jets. If front spray works and rear doesn’t, check the line and the rear check-valve before condemning the pump.
When It’s Electrical: Fuses, Relays, And Tailgate Wiring
Rear wiper circuits are simple: switch or stalk input, control module/relay, fuse, motor, and ground. The troublemakers tend to be a popped fuse from running a frozen blade or a broken wire in the hatch hinge boot. Both are common on liftgates where the harness bends with every open/close cycle.
Intermittent modes depend on a relay or a control module. If low and high speeds work but intermittent doesn’t, try a relay swap. If the rear wiper runs constantly, a stuck relay is a usual suspect. Model-specific fuse/relay positions vary, so confirm with your manual or fuse cover map.
Still dead after a new fuse and a relay test? Backprobe the motor connector. No power means work upstream: switch, module, or the harness. Power present with no movement means the motor or its internal park switch is done. At that point, plan on a motor replacement.
Repair Or Replace: Cost, DIY Difficulty, And Safety
DIY-friendly: blades, fuses, relays, and arm re-seating. These take basic hand tools and access to the fuse box. A careful visual of the hatch boot can spot broken wires that you can splice with heat-shrink sleeves if you’re handy.
Medium difficulty: rear washer fixes. Clearing a nozzle, checking hose joints, and topping up a winter mix are easy. Replacing a pump at the reservoir can be messy but doable with patience and a catch pan.
Pro-level: motor replacement and module diagnosis. Motors can be buried behind trim with tight linkages. Modules need wiring diagrams and meter work to avoid guesswork. If you’re unsure, see a qualified mechanic to prevent repeat failures and to protect rear defroster wiring in the same area.
One more note on winter: don’t run a frozen wiper to “break it free.” That move is why the phrase back wiper not working spikes each cold season. Warm the glass first, then test.
Back Wiper Not Working Fixes You Can Try Now
- Cycle The Hatch — Open and close the rear hatch or glass to confirm the latch switch tells the car it’s shut.
- Defrost, Then Test — Run the rear defroster, free the blade with a scraper, and retry the switch.
- Replace The Fuse — Swap the rear wiper fuse with the same amperage. If it pops again, stop and inspect the harness.
- Swap A Matching Relay — Use a non-critical identical relay as a test, then return it to its slot.
- Re-Seat The Arm — Tighten the arm nut if the motor turns but the arm slips.
- Clear The Nozzle — Use a pin and warm water on the rear jet; top up with winter washer fluid.
- Inspect The Boot — Flex the rubber harness boot at the hinge and look for cracked or broken wires. Repair as needed.
If you search “back wiper not working” during a storm, you’re not alone. With these checks, most drivers can restore a clear rear view without chasing parts.