One problem related to power window has been reported for the 2004 BMW 5 Series. The most recently reported issues are listed below.
2004 BMW 530 I. The consumer complained about several electrical problems, such as air bag warning light coming on/windows rolling down and then malfunctioning/trunk opening, and halo lights staying on. The onstar or sos systems was not working. Took the vehicle to the dealership. The manufacturer considered this vehicle a lemon. The dealership and manufacturer were not complying with the lemon law. This process was to buy back the vehicle. They were taking too long to resolve this matter.