Why Does the Car Window Roll Down by Itself?

[LePaige]

It could be due to a damaged retainer cable in the window regulator. The car is equipped with an anti-pinch function for the window glass. When the window encounters significant resistance while rolling up, the anti-pinch feature may be mistakenly triggered, causing the window to automatically roll down. This issue might stem from problems with the sealing strip or the window regulator itself. The specific reasons are as follows: 1. Damaged window lift motor or poor contact in the electrical wiring harness: If you notice a burnt smell when holding down the window button or hear unusual noises inside the door panel, it’s likely that the window lift motor components are damaged. In this case, it’s recommended to visit a 4S shop or auto repair shop to replace the window regulator motor. 2. Motor overheating protection: To protect the power supply circuit, window lift motors generally have an overheating protection mechanism. If components overheat for any reason, the motor will enter an overheating protection state, causing the window to malfunction. In such cases, simply wait for the motor to cool down. 3. Excessive resistance in the window track: The door window track is an easily overlooked detail. Over time, dust can accumulate in the track, increasing resistance and making it harder for the window to roll up. Regularly clean debris from the window track or use lubricant for smoother operation. 4. Loss of computer data: Disconnecting the battery, interrupting power or ground lines to the window control module during maintenance of other systems, or severe power loss when starting the engine can all cause the initialization data for the windows to be lost, preventing them from rolling up or down. In such cases, the window lift function needs to be reset.