What causes BMW window glass to fail to roll up or down?
2 Answers
The reasons for the failure of window glass to roll up or down include deformation or damage to the glass mud channel, loosening of the screws fixing the window regulator, or damage to the window regulator itself. Below are the solutions for window glass failure and the classification of automotive glass: Solutions for window glass failure to roll up or down: Turn on the ignition switch, pull and hold the switch upwards until the glass reaches the top, then continue holding for more than 3 seconds. Release the switch and immediately press and hold it down to lower the glass to the bottom for more than 3 seconds. Repeat the upward movement once more to complete the initialization procedure, and the window rolling function will be restored. This method is effective for most vehicle models. If the function is not restored, it is necessary to go to a professional repair shop for inspection. Classification of automotive glass: Automotive glass is mainly divided into laminated glass, tempered glass, and regional tempered glass, which can withstand strong impacts. According to their positions, automotive glass is classified into four types: front windshield, side window glass, rear windshield, and sunroof glass.
I have a lot of experience with power window failures. A common cause is a problem with the window switch button, where worn or dirty contacts may prevent signal transmission. Another possible issue is a faulty window motor, where internal gear jams or burnt coils prevent the glass from moving. Poor wiring connections, such as loose plugs or damaged wires at the door hinge area causing short circuits, can also be to blame. A blown fuse is another frequent culprit, usually found in the fuse box. Additionally, lack of lubrication in the tracks or foreign objects stuck in them can make window operation difficult. If a failure occurs, avoid forcing the window to prevent further damage—it's best to have it checked by a professional. My advice is to regularly clean the window tracks and apply lubricant to prevent jamming.
