BMW F12 Door Window Lifter Regulator Unit Rear Left N/S 7303787

BMW F12 Door Window Lifter Regulator Unit Rear Left N/S is an original component from the Window Regulators and Motors group, designed for the rear left side of the vehicle body. It ensures stable window guidance, proper operation of the lifting and lowering mechanism, and maintains the factory functionality of the window control system in your BMW.

Specifications and technical data

• SKU: 7303787
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 7303787
• Substitutable numbers: 7303787, 7304523, 67627304523
• Location on the vehicle: Rear, Left
• Part type: Regulator & Motor Assembly
• Category: Window Motors & Regulators

Purpose and function in the vehicle

The presented window regulator has been designed specifically for the rear left part of the BMW F12 series body. It is responsible for the precise guidance of the window in the tracks and the transmission of power from the control system to the window movement, which translates into smooth opening and closing of the window during daily use.

Thanks to its dedicated placement on the vehicle, the mechanism works with the factory electric window control system, maintaining the correct geometry, range of motion, and operating parameters specified by the manufacturer.

Advantages of using an original BMW component

Using an original BMW F12 Door Window Lifter Regulator Unit allows you to maintain the structural integrity of the door and avoid problems typical of ill-fitting replacements. The component is prepared for installation in place of the factory regulator, which facilitates service work and reduces the risk of additional modifications.

Key benefits include, among others:

• maintaining the factory operating characteristics of the window in the rear left part of the body,
• compatibility with the original electric control system,
• stable window guidance in the tracks, reducing tilting,
• the ability to use existing mounting points in the door.

Condition of the component and installation aspects

The window regulator is offered as a used part, which allows for an economical repair while maintaining the original BMW design. This type of solution is particularly beneficial for post-accident repairs or when replacing a worn-out mechanism, when you want to maintain the factory standard of workmanship.

The mechanism is intended for installation in place of the factory rear left window regulator. With properly performed installation, it is possible to restore the correct operation of the window without the need to interfere with other door elements, such as upholstery or seals, beyond standard service disassembly.

BMW Window Regulators and Motors – expansion and service

If you are planning a comprehensive repair or upgrade of the door and window area in your BMW and need other components from the same group, such as window lifting mechanisms, electric drives, or guides, check out the available parts in the BMW Window Regulators and Motors category.

Operational safety and knowledge of common faults

A functional window regulator is important not only for comfort but also for safety – it enables the window to be closed properly, which affects the tightness of the body, protection of the interior against moisture, and the correct operation of comfort systems. In the case of BMW, it is also worth knowing the specifics of the engines and common faults that can generate additional service costs – this is described in more detail in the article Emergency BMW E90 engines: check what can ruin your budget!, which helps to better plan the technical maintenance of the car.