Quick answer
Listen when you press the switch. If you hear nothing at all, the fault is electrical: a fuse, the switch, the window lockout button, broken wiring in the door hinge, or the motor. If the motor whirrs or clicks but the glass doesn’t move, or the glass drops or goes crooked, the window regulator (the mechanism that lifts the glass) has usually failed. If only the “auto up” feature has stopped, the window may simply need re-initialising.
Is this a DIY job?
- Difficulty: Easy for the first checks; Medium to replace a switch; Medium to Pro to replace a motor or regulator
- Time: 15 minutes to check; 1 to 3 hours to replace a regulator
- Tools: owner’s manual, trim tool, multimeter, socket set, tape (to hold the glass)
- Skills: removing door trim without breaking clips; basic multimeter use
The checks are easy. Replacing a regulator or motor means taking the door trim off, which is doable for a careful DIYer, but some doors contain side airbags and their wiring, and the glass must be supported so it can’t drop.
Step by step
- Check the lockout button. Most cars have a window lock button on the driver’s switch panel that disables the passenger switches. Make sure it’s off.
- Try both switches. For a passenger window, try the driver’s master switch and the switch in that door. If one works and the other doesn’t, the switch that doesn’t work is the likely fault.
- Listen as you press the switch. Sit in the car with the doors closed and the radio off. – No sound at all: electrical fault. Go to step 4. – Motor runs, glass doesn’t move, or a grinding or clicking noise: the regulator’s cable, gears or plastic guides have likely broken. Go to step 8. – Glass moves slowly or stops part-way: the guide channels may be dry or the motor may be tired. Try a silicone spray in the rubber channels; if it doesn’t help, the regulator or motor is wearing out.
- Check the fuse. Look in the owner’s manual for the window fuse or fuses. If all the windows have stopped at once, a shared fuse, relay or the master switch is the usual cause. (see How do I check and replace a blown fuse?)
- Check the door hinge wiring. Open the door and look at the rubber boot between the door and the body. Wires in here flex every time the door opens and can break over time. Check whether the window works intermittently when you move the door.
- Re-initialise the window. If the window works but “auto up” or “one-touch” has stopped (common after a battery change or a flat battery), the window module may have lost its position. On some cars you close the window fully and keep holding the switch up for a second or more; others also need the window run fully down and the switch held there. The exact routine varies by make: check your owner’s manual. Keep hands and objects clear, because the anti-pinch (auto-reverse) feature may not work while you’re doing the reset.
- Test for power at the motor (Medium). With the door trim off, a multimeter at the motor’s plug will show whether voltage arrives when the switch is pressed. Power at the plug but no movement points to the motor. No power points back to the switch or wiring.
- Secure the glass before working on the regulator. If the regulator has failed, the glass may be loose. Raise it by hand if you can and tape it to the door frame with strong tape over the top of the door, so it can’t drop when you unbolt things.
- Replace the faulty part. Regulators often come with the motor attached, or as a separate frame. Match the part to your door (front/rear, left/right).
- Re-initialise after the repair. Most cars need the window position relearned after a motor or regulator is replaced, or the auto-up and pinch protection won’t work correctly.
Specs table
Symptom and likely cause
| What happens | Likely cause |
|---|---|
| All windows stopped at once | Fuse, relay, master switch, or window module |
| One window, no sound from either switch | Motor, wiring (door hinge), or fuse for that door |
| Works from one switch but not the other | The switch that doesn’t work |
| Motor whirrs, glass doesn’t move | Regulator cable, gear or guide broken |
| Glass drops, tilts or clunks | Regulator broken or glass came off its clamps |
| Slow movement | Dry or dirty guide channels; tired motor or regulator |
| Auto-up stopped after battery change | Window needs re-initialising |
| Works only when door is moved | Broken wire in the door hinge loom |
What you’ll need
- blade fuses
- electric window switch (vehicle-specific)
- window regulator or window regulator with motor (vehicle-specific)
- door trim clips (some always break)
- plastic trim tool
- digital multimeter
- silicone spray
When to call an auto electrician
- Your door has a side airbag, or airbag wiring runs through it. Airbag systems are professional-only.
- Several windows, locks or mirrors have stopped at once. That can point to a body control module or network fault.
- Wiring in the door hinge loom is broken. Repairing it so it survives flexing takes care and the right materials.
- The window won’t close and rain is coming. A workshop can usually secure the glass the same day.
- Auto-up or pinch protection doesn’t work after a repair and re-initialising hasn’t fixed it.
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Related questions
Q: How do I close a window that’s stuck open? A: Try the switch while gently helping the glass up with flat palms on both sides. If the motor works but the regulator is broken, this sometimes gets it up. Then tape it in place or have the regulator replaced.
Q: Why did my auto-up window stop after I changed the battery? A: Many window modules lose their stored window position when power is lost. Re-initialising, usually by holding the switch for a moment at fully closed (and on some cars at fully open too), normally fixes it. Check your manual for your car’s routine.
Q: Is it the motor or the regulator? A: If you hear the motor running but the glass doesn’t move, it’s usually the regulator. If there’s no sound and power reaches the motor plug, it’s usually the motor.
Q: Can I lubricate a slow window? A: A silicone spray in the rubber guide channels can help. Avoid grease or oil-based products on the rubber.
Sources
- Counterman, “Power window regulators: what could possibly go wrong?” – regulator and motor failure modes; no-sound vs motor-noise diagnosis; relearn procedure after replacement. https://www.counterman.com/power-window-regulators-what-could-possibly-go-wrong/ (checked October 2026)
- Hyundai owner’s manual, “Power Windows Operation and Resetting” – an example reset routine (close the window and keep pulling the switch up for at least a second); auto-reverse doesn’t work during the reset. https://ownersmanual.hyundai.com/full_webhelp/NX4/2025/en_GN/id5b653da58e2.html (checked October 2026)