Aisin RPAB-017 Window Motor and Regulator Assembly - Rear Left

OE-Style Rear Left Window Regulator

The Aisin Power Window Regulator w/ Motor, part number RPAB-017, is a direct-fit replacement for the rear left window on select BMW applications. It is engineered to OE standards with controlled manufacturing processes that focus on fit, function, and consistent operation.

Compatible with BMW 525i, 530i, 540i, 525iT, 535i, and M5 rear left applications, this assembly is built for drivers needing a dependable replacement for a failing power window system. RPAB-017 is also a practical cross-reference for select OE and aftermarket listings.

Key Features

• Power window regulator and motor assembly for the rear left position
• OE-standard fitment for select BMW 5 Series and M5 models
• Re-engineered manufacturing process to support form, fit, and function
• Built and tested under controlled environmental conditions
• Part number RPAB-017 for easy catalog matching

Detailed Description

Aisin RPAB-017 is a window motor and regulator assembly designed for select BMW rear left door applications. It serves as a direct replacement for vehicles including the 1989-1995 BMW 525i, 1994-1995 BMW 530i, 1994-1995 BMW 540i, 1993 BMW 525iT, 1989-1993 BMW 535i, and 1991-1993 BMW M5. This part cross-references Dorman - OE Solutions 748-738 and WAI WPR1176LMB for the same application.

The Aisin Power Window Regulator w/ Motor line focuses on OE-style replacement parts that are manufactured to meet original equipment standards. RPAB-017 is intended for buyers replacing a worn, slow, or non-functioning rear left window assembly on BMW 525i and related models.

Common Repair Symptoms

• Rear left window will not move up or down
• Window moves slowly or stops partway
• Grinding, clicking, or binding during operation
• Motor runs but the glass does not respond correctly
• Intermittent window operation from the rear left door

Installation Notes and Tips

Verify the rear left position and confirm vehicle year, model, and body style before ordering. Compare the original unit and connector layout to the replacement assembly before installation. After installation, test full window travel and switch operation to confirm proper regulator movement.

Quality Assurance

Aisin manufactures this assembly to meet OE standards and uses strict quality control checks during production. The design is re-engineered to improve original equipment concepts and is validated through environmental testing conditions to help ensure consistent fit and function.