The difference in power window speeds among different car doors is mainly due to the following reasons:
Motor and Mechanism Differences – The driver's side window is often used more frequently and may have a more robust motor compared to the other doors. Over time, motors in less-used windows may perform differently.
Battery Voltage and Wiring Resistance – Variations in wiring length and resistance can cause slight differences in power delivery to each window motor. The farther the window is from the power source, the more voltage drop may occur.
Window Track Wear and Lubrication – Dirt buildup, lack of lubrication, or wear and tear on the window tracks can create friction, making some windows move slower than others.
Weight of the Glass – Some windows may have thicker or larger glass panels, which require more effort from the motor to move.
Control Module Settings – Some vehicles have different speed settings for driver and passenger windows as part of their design, ensuring smoother operation or safety considerations.
Regular maintenance, such as cleaning and lubricating window tracks, can help minimize these differences.
