These instructions apply to the Hyundai i20 Mk3 (BC3) 2020-Present.
For other models, please choose your vehicle here.
If the one-touch (auto up/down) windows on your Hyundai i20 Mk3 (BC3, 2020–present) have stopped working — or only move while you hold the switch, usually after a battery disconnection or a flat battery — each window needs re-initialising so it relearns its closed position. It’s a quick no-tools job, and it’s a normal consequence of losing power rather than a sign anything is broken.
Why One-Touch Stops Working
Each window motor stores its top (closed) position so the auto function and the anti-trap (pinch protection) know where the glass stops. Cutting power clears that memory, so the window only inches up while you hold the switch. Re-initialising restores normal operation.
How It Works on the i20 Mk3
The driver’s door (and, on higher trims, the other doors) has an express-up/down feature: one tap and the glass runs to its stored end position on its own. To make that safe, the motor also runs anti-trap protection — it senses resistance as the glass rises and reverses if it meets a hand or object. Both features depend on a learned reference point at the top of travel. When the 12 V supply is interrupted, that reference is lost, so the module disables express and reverts to a manual hold-to-move mode until you teach it the closed position again.
Getting Ready
- Switch the ignition on — you don’t need the engine running.
- Do it with the door closed so the glass can reach its true sealed top.
- Work one window at a time from that door’s own switch.
- Make sure the runner is clear of grit or ice so the glass isn’t stopped short.
- Be ready to keep holding for about a second after the glass is fully shut — that brief hold is what registers the limit.
How to Re-initialise the i20 Mk3 Windows
- Turn the ignition on.
- Work on one window at a time from its own switch.
- Pull the switch up and hold to fully close the window, and keep holding for about 1 second after it’s fully shut.
- Release the switch.
- Test the one-touch function — a single tap up or down should now run the window automatically. Repeat for each window that lost it.
If It Still Won’t Auto-Close
- Repeat the procedure — the brief hold after the glass reaches the top is what registers the limit.
- Make sure the glass reaches the very top — grit or ice in the runner can stop it short.
- After a battery disconnection this is the step Hyundai lists to restore the windows.
- Check the 12 V battery and the window fuse — a weak battery or blown fuse can let the learn drop out again at the next start.
- Persistent fault? A switch or window-module problem can store a code — look it up on autodtcs.com.
What Happens Next
Once the closed position is relearned, a single tap runs the window fully up or down, and the anti-trap reversal is back on. The setting is stored, so it stays put until the next time the door module loses power — you won’t need to repeat it day to day.
Frequently Asked Questions
Why did my i20 windows lose auto after the battery was off?
Disconnecting power wipes the stored closed position, so auto and anti-trap switch off until you re-teach each window. It’s a safety default rather than a fault — the module won’t run the glass automatically until it knows exactly where the top of travel is again.
The window only moves while I hold the switch — same fault?
Yes — the pull-and-hold routine re-teaches it and one-touch returns. Hold-to-move is the safe fallback the module uses whenever the learned limit is missing, so completing the relearn brings the express function straight back.
The window bounces back down when closing — why?
That’s the anti-trap protection reacting because the limit isn’t learned, so the module treats the seal at the top as an obstruction. Complete the pull-and-hold routine, keeping the switch held for a second after the glass shuts, and it clears.
Do I need any tools?
No — just the door switches with the ignition on. There’s no menu, dealer visit or scan tool involved; the whole relearn is done by holding the window switch through its top stop.
Do I have to relearn every window?
Only the ones that lost the auto function, though after a battery job it’s quickest to run through them all. Each takes only a few seconds, so doing the set together avoids finding a forgotten one on the motorway later.
It keeps losing one-touch — what should I check?
Repeated loss usually points to a tired 12 V battery or a failing window fuse letting the module reset. Have the battery and charging tested; if a fault code is stored for the switch or motor, look it up on autodtcs.com.
To clear a service reminder after maintenance, see our i20 Mk3 service reset guide. For warning lights, look up the code on autodtcs.com.
Independent guide — not affiliated with Hyundai. Always follow your official service manual and safety precautions. Read our full disclaimer.