BMW F40 Door Wiring Cable Harness Loom Rear Left Right N/O/S 8714478

BMW F40 Door Wiring Cable Harness Loom Rear Left Right is a factory electrical installation designed for the rear left and right door zones in BMW F40 series models. The component belongs to the Wires, harnesses and connectors group, enabling a proper electrical connection between the door and the vehicle body. It is a practical solution for users who want to restore full functionality of the door electronics after a collision, bodywork repair, or door replacement.

Specifications and technical data

• SKU: 8714478
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 8714478
• Substitutable numbers: 8714478
• Location on the vehicle: Rear, Right, Left
• Category: Wiring Harnesses, Cables & Connectors

Purpose and vehicle placement

The presented wiring harness is designed to operate in the rear part of the vehicle, in the area of the left and right doors. The placement on the vehicle includes the rear, which means the component is responsible for transmitting signals and power between the main installation and the modules located in the rear doors. Such a solution allows for the correct operation of the door's electrical components, in accordance with BMW's factory specifications.

Technical characteristics of the harness

The harness belongs to the Wires, harnesses and connectors category, which means it includes a set of wires along with appropriately selected connectors and connection points. The design is prepared for installation in the original mounting points in the BMW F40, which facilitates service and reduces the risk of installation errors. The connectors used are matched to the factory sockets in the doors and the body, so there is no need to modify the installation.

The arrangement of the wires in the harness is adapted to the geometry of the door and the grommets between the door and the pillar, which helps maintain the proper bending radius of the wires and reduces mechanical stress when opening and closing the door. This configuration promotes stable operation of the electrical installation in the long term.

Service application and benefits of installation

Replacing the wiring harness in the rear doors of a BMW F40 is particularly recommended in situations where:

• mechanical damage to the wires or connectors has occurred (e.g., after a collision or bodywork intervention),
• there are intermittent power interruptions to door components, which are difficult to locate during individual wire repairs,
• a comprehensive renovation of the electrical installation in the rear part of the body is necessary.

Using a complete harness allows for reducing diagnostic and repair time, while simultaneously restoring the consistency of the installation in accordance with the factory BMW design. This solution is particularly beneficial in professional workshops and for post-accident repairs, where repeatability and predictability of the final result are important.

Compatibility, identification and quality

The element is intended for BMW vehicles from the F40 family, and its identification in parts catalogs is carried out via the OEM part number and interchangeable numbers, which are listed in the technical specification. Thanks to this, the harness can be precisely matched to the specific vehicle configuration, minimizing the risk of incompatibility. The product belongs to the group of original BMW solutions, which helps maintain the consistency of the electrical installation throughout the vehicle.

The used condition means that the harness comes from disassembly, which in practice allows for the use of a component with factory geometry and connectors, while simultaneously reducing costs compared to a new part. For many users and workshops, this is a reasonable compromise between quality and repair budget.

Installation expansion and related components

Replacing the wiring harness in the rear doors is often associated with additional work in the area of body electronics, such as checking the condition of grommets, ground connectors, or door control modules. It is worth verifying the condition of other installation elements on this occasion to avoid the return of the fault. 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 additional harnesses, wires, or connectors, check the available parts in the BMW Wires, harnesses and connectors category.

For users interested in the broader context of using original components in vehicles of different generations, an article comparing the construction of classic and modern models, which also discusses the advantages of using OEM parts, may be helpful – you can find it here: Classic Mini vs modern MINI – how the construction has changed and which original Mini parts help preserve their character.