ACI 388031 Power Window Motor and Regulator Assembly - Front Left

Reliable Window Motor and Regulator Assembly for BMW Models

The ACI Window Assembly 388031 is a new power window motor and regulator designed specifically for select BMW vehicles. Engineered with a hardened steel gear, this assembly ensures durability and consistent performance for your BMW 525i, 528i, 530i, 540i, and M5 models.

• New power window motor and regulator assembly
• Hardened steel gear for enhanced durability
• Meets or exceeds OEM specifications
• Compatible with BMW 525i, 528i, 530i, 540i, and M5
• Part number 388031 for precise fitment

About the ACI Window Assembly Product Line

The ACI Window Assembly product line focuses on delivering reliable window motor and regulator solutions that meet or exceed original equipment manufacturer standards. This line is designed to provide direct replacement parts that maintain factory performance and fitment, ensuring proper operation of power windows in compatible vehicles.

Product Details and Specifications

This window motor and regulator assembly features a hardened steel gear, which contributes to long-lasting operation and resistance to wear. The assembly is a new unit, not remanufactured, providing a fresh component for your vehicle’s power window system. It does not include express up or down functionality but offers smooth and reliable window movement. Designed specifically for BMW 525i, 528i, 530i, 540i, and M5 models, part number 388031 ensures a precise fit and proper integration with your vehicle’s electrical and body systems.

Common Issues Addressed by This Window Motor Assembly

• Power window failure or slow operation
• Window regulator malfunction causing window misalignment
• Grinding or clicking noises from worn gears
• Window stuck in open or closed position
• Intermittent window movement or no response to switch

Installation Notes and Tips

Installation of the ACI 388031 window motor and regulator assembly requires removal of the door panel and disconnection of the existing motor and regulator. Ensure all electrical connections are secure and test window operation before reassembling the door panel. Use appropriate tools to avoid damage to the hardened steel gear and related components. Refer to the vehicle’s service manual for detailed instructions specific to BMW 525i, 528i, 530i, 540i, and M5 models.

Quality Assurance and Warranty

The ACI Window Assembly 388031 is manufactured to meet or exceed OEM standards, providing reliable performance and durability. This new power window motor and regulator assembly undergoes quality checks to ensure proper function. Warranty coverage details should be confirmed with the distributor or installer, as they may vary.