Keystone BM1550115 Rear Power Window Regulator Left Driver Side Without Motor

The Keystone BM1550115 is an OEM-replacement rear power window regulator for the left (driver) side, designed as a direct-fit replacement for the BMW 5 Series. This regulator is sold without a motor, making it an ideal solution when the regulator mechanism itself has failed while the original motor remains serviceable.

The BMW E60 5 Series uses a cable-driven power window system where the regulator mechanically guides the window glass up and down along dual rail tracks. Over time, cables can fray or snap — particularly near the motor attachment point — causing the window to become stuck, drop into the door, or operate erratically. Replacing the regulator restores smooth, reliable window operation.

Key Features:

• Direct OEM-replacement design for precise, hassle-free installation
• Left (driver) side rear window position
• Power window system — motor not included; compatible with factory original motor
• Replaces BMW OEM part number 51357184745
• Partslink number: BM1550115
• Engineered to meet or exceed original equipment specifications

This regulator is designed to work with the factory-style window motor. When reinstalling, transfer the existing motor from the old regulator to this replacement unit. Inspect the window guide seals and plastic retaining clips during installation, as worn seals can increase friction and cause premature regulator wear.