BMW F40 Rear Left Right N/O/S Wiring Harness Door Loom N/O/S 8714479

BMW F40 Rear Left Right N/O/S Wiring Harness Door Loom is an original electrical installation component designed to support the rear doors in BMW F40 series models. Thanks to its factory design, the harness ensures proper electrical signal routing and a stable connection between the body modules and door equipment. It is a practical solution for workshops and users who want to restore full functionality to the rear door electrics without interfering with the factory installation architecture.

Specifications and technical data

• SKU: 8714481
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 8714479
• Substitutable numbers: 61128714481, 8714481, 8714479
• Location on the vehicle: Rear, Right, Left
• Category: Doors & Door Skins

Purpose and function of the BMW F40 door harness

The presented harness is a component from the Doors and door panels group, responsible for the electrical connection between the body and the rear doors on the left and right sides. It includes the wires and connectors necessary for powering and controlling door equipment, such as actuators, switches, or control modules, in accordance with the factory BMW standard.

The placement on the vehicle covers the rear part of the body on the left and right sides, which allows the harness to be used in both rear doors within a single vehicle. Thanks to this solution, it is possible to restore the original installation path in an orderly manner, without the need to fabricate wires or modify connectors.

Construction and fitment for BMW installations

The harness has been designed as a component compatible with the factory electrical architecture of the BMW F40, which translates into:

• dedicated connectors matched to the sockets in the doors and body,
• appropriately selected wire lengths for the rear left and right sides,
• manufacturer-specified routing and mounting points within the door and pillar area.

Such a solution facilitates installation and reduces the risk of installation errors, and also helps maintain proper protection of the wires against abrasion or mechanical damage.

Service application and installation benefits

Replacing the door harness in a BMW F40 is recommended in situations where there are problems with the operation of the rear door electrics, such as power interruptions, unstable operation of electrically controlled components, or mechanical damage to the wires. Using an original harness allows for:

• restoring proper communication between control modules and door equipment,
• reducing the need for additional installation diagnostics after assembly,
• maintaining consistency with BMW's factory service documentation.

The product comes from the BMW parts group, which promotes compatibility with the existing vehicle installation and facilitates identification based on manufacturer markings and reference numbers.

Characteristics of the used product

The offered harness is a used component, which means it has been removed from a donor vehicle and verified for its suitability for further use. This type of service solution allows for cost savings on repairs while maintaining the original design of the electrical installation. In practice, this is a frequently chosen option for accident repairs or restoring door functionality after long-term use.

Part selection by numbers and technical support

The harness has an OEM part number and interchangeable numbers, which facilitates precise matching to a specific BMW F40 configuration. When selecting, it is recommended to compare the markings with the existing installation or the vehicle's service documentation to ensure full functional compatibility. In case of doubt, it is worth seeking the help of a specialist who will verify compatibility based on manufacturer numbers or vehicle data.

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

Additional information and expert knowledge

When working with components from the secondary market, such as harnesses, modules, or drive components, it is worth knowing the principles of proper part selection by OEM and reference numbers, as well as the real differences between new and used components. An extended discussion of these issues, along with cost examples and verification procedures, can be found in the article Why it is worth buying used gearboxes and engines – facts instead of myths, which organizes the most important information from the perspective of the user and the workshop.