These instructions apply to the Hyundai i20 Mk2 (GB) 2014-2020. For other models, please choose your vehicle here.
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If the electric sunroof on your Hyundai i20 Mk2 (GB, 2014–2020) has stopped opening or closing properly, stops part-way, or lost its one-touch function, the roof controller needs re-initialising. It usually happens after the battery is disconnected or goes flat, after a fuse is pulled, or if the roof was forced. The fix is a quick relearn you can do yourself with the roof switch, no tools.
Why the Sunroof Loses Its Calibration
The roof module stores the fully-open and fully-closed positions so it can run automatically and stop if it meets resistance (anti-trap). A power loss clears those references, so until you re-teach them the roof only moves while you hold the switch. This is one of the follow-up steps listed in the i20 battery procedure.
Before You Start
- Make sure the battery is well charged — the relearn won’t complete on a weak battery.
- Clear the roof and tracks of debris so the glass can reach its end stops.
- Keep hands and objects clear of the opening — the anti-trap protection is off during the relearn.
How to Re-initialise the i20 Sunroof
- Turn the ignition on.
- Press the switch to close the roof and hold until it is fully closed, then release.
- Press and hold the close switch again for about 10 seconds. The sunroof tilts and moves slightly to begin the relearn.
- Keep holding the switch — the roof runs through a full automatic cycle: sunshade open → sunroof tilt open → slide open → slide closed → sunshade close.
- When the cycle finishes the procedure is complete. Check the one-touch open and close.
Do not release the switch during the automatic cycle — if you let go early, start again from the closed position.
If the Sunroof Still Won’t Auto-Operate
- You released the switch during the cycle: repeat and hold throughout the full sequence.
- Weak battery: charge it and try again.
- Dirty or dry tracks: clean the channels and apply silicone lubricant.
- Just did a battery job: expected — see our i20 battery disconnect/reconnect guide.
Frequently Asked Questions
Do I need a diagnostic tool to reset the i20 sunroof?
No — the relearn is done entirely with the roof switch as described.
Why does the roof run a full open/close cycle by itself?
That auto-cycle is how the i20 re-learns each end stop. Hold the switch and let it complete the whole sequence.
Why did the sunroof stop working after I changed the battery?
The roof module loses its references during a power loss. Run the relearn above and full function returns.
Is the anti-trap working during the relearn?
No — keep hands and objects clear of the opening while teaching the end stops.
If you also lost the windows after a power cut, see our i20 battery guide, or clear a reminder with the i20 Mk2 service indicator reset guide.
Disclaimer: The information on this page is provided for general guidance only. Always follow your official service manual and safety precautions when working on your vehicle. We are not responsible for errors, omissions, or any damage resulting from the use of this information.
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