Dorman 741-478 Power Window Motor and Regulator Assembly - Front Left

Reliable Window Motor and Regulator Assembly for BMW Models

The Dorman 741-478 window motor and regulator assembly is designed to restore smooth window operation in select BMW vehicles. Engineered with a plastic gear and bolt attachment type, this assembly provides a direct replacement for the power window system in BMW 525i, 528i, 530i, 540i, and M5 models.

• Plastic gear material for consistent performance
• Bolt attachment type for secure mounting
• Includes regulator for complete window operation
• Two electrical terminals for power connection
• Non-express up or down window function
• Does not include wiring harness or mounting hardware
• Installation instructions not included

Product Details and Specifications

This Dorman window motor and regulator assembly (part number 741-478) is specifically designed for BMW 5 Series and M5 vehicles, including the 525i, 528i, 530i, and 540i models. The plastic gear construction balances durability with smooth operation, while the bolt attachment type ensures a secure fit during installation. The assembly includes the regulator, eliminating the need to source separate components. It features two electrical terminals for connection but does not come with a wiring harness or mounting hardware, so these may need to be reused from the original part. This unit operates with a standard, non-express window function and does not include anti-pinch or micro-controlled embedded logic features.

Common Applications and Problem Resolution

• Restores power window function in BMW 525i, 528i, 530i, 540i, and M5 models
• Replaces faulty or worn window motor causing slow or non-responsive window movement
• Addresses issues with window regulator failure such as window dropping or misalignment
• Eliminates grinding or unusual noises from plastic gear wear
• Resolves intermittent electrical connection problems related to motor terminals

Installation Notes and Tips

Installation requires removal of the door panel and disconnection of the existing window motor and regulator assembly. Since mounting hardware and wiring harness are not included, retain original components for reuse. Ensure the bolt attachment points align correctly and securely fasten the assembly. Testing window operation before reassembling the door panel is recommended to confirm proper installation. Professional installation is advised if unfamiliar with power window systems.

Quality Assurance and Warranty

Dorman parts are manufactured to meet or exceed OEM standards for fit and function. The 741-478 window motor and regulator assembly undergoes quality checks to ensure reliable operation in compatible BMW models. Warranty coverage details should be confirmed at the point of purchase, as they may vary by distributor.