Mercedes-Benz E320 master window switch failure due to faulty cup holder design on Mercedes-Benz E320

Some Mercedes-Benz E320 owners report experiencing master window switch failures, which can lead to power window malfunctions. These issues may stem from the closed nature of the power window system, making it difficult to inspect during regular maintenance. Additionally, electrical problems in the E320 can arise from various factors, including water leaks, bad stabilizer bar bushings, and rust. Owners have noted specific problems, such as individual windows, like the front passenger window, not functioning correctly in certain positions. Repairs often involve components like the controller, power window control module, and window regulator. Troubleshooting steps recommended for these window issues include checking fuses and the master switch, as well as listening for specific sounds when operating the window switch. Addressing these concerns promptly is crucial for ensuring the proper functionality of the power window system.