BMW F40 Switch Control Power Window Lifter Button Rear Left N/S Trim

BMW F40 Switch Control Power Window Lifter Button Rear Left N/S Trim is an original component from the Switches, control elements and ignition locks group, designed for operating the rear left window in BMW F40 series vehicles. Finished in black, it blends harmoniously with the interior design, ensuring a consistent look for the door panel and precise control of the rear window on the driver's side.

Specifications and technical data

• SKU: 7945215
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 7950756
• Substitutable numbers: 7950756, 61317950756, 51417945215, 7945215
• Location on the vehicle: Rear, Left
• Color: Black
• Category: Switches & Controls

Purpose and function in the window control system

The presented switch is dedicated for installation in the rear left part of the vehicle, within the door panel. It is responsible for the electric control of the window in this specific location, working in conjunction with the factory electrical system of the BMW F40. By maintaining the original design, it ensures proper communication with comfort modules and a predictable response to every input from the driver or passenger.

This component is particularly important in cases of problems with raising or lowering the window, intermittent button operation, or lack of response to signals from the rear doors. Using an original switch from the same component group allows for restoring factory functionality without the need for modifying the wiring harness or connectors.

Construction, color scheme and fitment for the BMW interior

The switch is finished in black, typical for factory BMW F40 interior trims, which facilitates aesthetic integration with the door upholstery. The shape of the housing and the geometry of the clips are adapted to the original mounting hole in the door, ensuring that installation is straightforward and does not require any modifications to plastic elements.

The layout of the button and its travel have been designed to provide tactile, repeatable operation and convenient handling even during frequent use. Using the original design minimizes the risk of looseness, unreliable electrical contact, or improper fitment with the door panel.

Condition, origin and benefits of using original parts

The offered element comes from the BMW parts group and is a used product, which allows for combining an attractive purchase cost with the preservation of the factory manufacturing standard. Unlike many aftermarket replacements, the original switch is designed for long-term compatibility with the electrical system of the specific BMW F40 generation, which translates into operational stability in daily use.

Using an original switch to replace a damaged or worn one is a beneficial solution both technically and visually – the consistency of the material texture, the shade of black, and the ergonomics of operation are all maintained in accordance with the vehicle manufacturer's specifications.

Installation tips and practical application

The switch is intended for installation in the rear left part of the body, in the place of the factory window control button. In a typical replacement scenario, it is sufficient to remove the door panel, disconnect the old element from the harness, and seat the new switch in the socket. Thanks to the preservation of the original connector and housing geometry, this process is generally simple for an experienced mechanic or automotive electrician.

The element will prove useful both for standard repairs after a failure and for organizing the installation after previous, unprofessional modifications. Proper matching of the switch to the specific BMW F40 model allows for avoiding compatibility issues, such as errors in window operation or incorrect functioning of the comfort closing feature.

Expanding the control system and related components

If you are planning a comprehensive repair or upgrade of the window and lock control zone in your BMW and need other elements from the same group, such as additional buttons, control modules, or ignition locks, check the available parts in the BMW Switches, control elements and ignition locks category.

When selecting used control elements, it is worth paying attention to compliance with manufacturer markings and fitment for the specific vehicle generation. Differences in equipment versions may affect the installation configuration, which is why analyzing OEM and reference numbers in the technical specification and comparing them with vehicle data is a good starting point.

More about the cost-effectiveness of used parts

Choosing a used, original window control switch is often a reasonable compromise between cost and quality. The issue of the cost-effectiveness of dismantled parts – compared to new originals and aftermarket replacements – has been discussed in more detail in the article: Original, aftermarket or used – which car parts are the most cost-effective?. It allows for a better understanding of the differences in durability, fitment, and total cost of ownership.

If you are also interested in the topic of used components in the premium segment, including solutions used in other brands, you will find a practical perspective on this issue in the blog post Used parts for Mercedes - original parts from dismantling, which shows how properly selected second-hand elements can lower service costs without sacrificing quality.