BMW 1 SERIES F20 Rear Left Right N/O/S Wiring Harness Door Loom N/O/S 9251724

BMW 1 SERIES F20 Rear Left Right N/O/S Wiring Harness Door Loom is a factory-original automotive wiring harness designed for the rear doors of BMW F20 series models. This component ensures a secure and stable electrical connection between the door and the vehicle body, guaranteeing the proper operation of locks, window regulators, and other electrical components within the door. Thanks to its original design, the harness is precisely matched to the door geometry, which facilitates installation and reduces the risk of damage to the wiring.

Specifications and technical data

• SKU: 9251724
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 9251724
• Substitutable numbers: 61129251724, 9251724, 9251734, 9251723
• Location on the vehicle: Rear, Right, Left
• Category: Doors & Door Skins

Purpose and vehicle placement

The presented door wiring harness is intended for installation in the rear section of the BMW F20 body, with the possibility of application on either the right or left side. It is responsible for routing signals and power between the body modules and components located in the door, such as actuators, switches, or control elements. Thanks to the dedicated wire routing and properly selected connectors, the harness minimizes the risk of chafing and interference in the operation of the electrical system.

Construction and technical function

BMW 1 SERIES F20 Rear Left Right N/O/S Wiring Harness Door Loom has been designed as a complete, ready-to-install door wiring solution. The connectors used are factory-matched to the sockets in the door and body, allowing for plug-and-play installation without the need for modifying the wiring. The appropriate wire cross-section and their logical grouping ensure stable power supply to receivers and correct transmission of control signals, which is crucial for the reliability of comfort and safety systems in the vehicle.

The harness is an item from the Doors and door panels category, which means it has been developed taking into account the specific mechanical loads occurring in the area of hinges and door grommets. Proper wire routing limits stress during repeated opening and closing of the door, which translates into a longer service life of the installation.

Benefits of using an original BMW harness

Using a dedicated door harness in a BMW F20 brings a number of practical technical benefits:

• secure fit to the rear door structure and factory mounting points,
• compliance with the vehicle's factory electrical diagram,
• reduced risk of installation errors compared to universal solutions,
• stable operation of comfort and control systems in the door.

For the user, this means predictable operation of electrical components in the rear doors and easier diagnostics of potential faults in the future. The original design of the harness also supports maintaining the consistency of the installation with BMW service documentation.

Condition of the item and service application

The offered harness is a pre-owned item, making it an attractive service solution in the event of repairing a damaged door installation, e.g., after wire chafing in the grommet or mechanical interference in the door area. Replacing the complete harness instead of performing point repairs on wires allows for restoring the factory routing of the installation and limiting the risk of further failures resulting from makeshift connections.

Due to its dedicated purpose for the rear part of the body, the harness will work well for repairs on both the right and left sides, depending on the specific vehicle configuration. This is a practical solution for workshops specializing in the BMW brand and users looking for factory-compliant electrical components.

Expanding upgrades in the BMW door area

If you are planning a comprehensive repair or upgrade of the door zone in your BMW and need other elements from the same group, such as panels, reinforcements, or complete door shells, check out the available parts in the BMW Doors and door panels category.

For those interested in comparing technical solutions used in different brands and sports versions, it may be useful to discuss the construction of engines, brakes, and chassis in premium cars – you can find more on this topic in the article Audi RS vs other models – what is hidden under the hood and chassis?.