What are the reasons why car windows cannot be rolled down?

[OJohn]

Reasons why car windows cannot be rolled down: 1. Circuit failure; 2. Mechanical failure. Mechanical failure may be caused by foreign objects stuck in the window. If there are no foreign objects, it is likely a circuit failure, possibly due to a burned-out motor. It is recommended that the owner promptly visit a repair shop or 4S store for repairs. In addition to rainwater and sand easily getting into the window gaps, small stones mixed in sandstorms may fly into the gaps of the car window. If not addressed in time, dust and sand in the lifting track will accumulate over time. When the accumulation reaches a certain level, the resistance between the glass and the groove in the window will increase. In severe cases, the stones inside may scratch the glass or damage the window lifting system.