High/Medium/Low represents the probability of this cause occurring
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Suggest to lubricate the car window guide or replace or repair the related faulty parts, suggest to repair at workshop. The usual keypoint of diagnose are:
1. Detail lubricating the glass channeling guide, ensure ther is no foreign subtances in the channeling guide and the channeling guide is not aged and deformed. Replace if necessary.
2. Check if the regulator handle is faulty, steel lifting cable is it broken, window regulator assembly is it faulty, related screw is it loosen. Replace the part or tighten the screw if the above situation is met.
3. Check the steel lifting cable is it in the correct position, adjust if necessary.
4. Check and adjust the position of window bracket。
5. Perform test on winding the window up and down to ensure the problem is resolved after repairing done.