Mini Cooper R57 Wiring Loom Harness Rear Trunk Lid 9278356

Mini Cooper R57 Wiring Loom Harness Rear Trunk Lid is an original electrical system component by BMW, designed for the rear section of the vehicle body. It ensures a stable electrical connection between the trunk lid and the rest of the vehicle, which translates into the proper operation of all connected electrical consumers and daily driving comfort.

Specifications and technical data

• SKU: 9278356
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 9278356
• Substitutable numbers: 9278356, 61129278356, 61129144846, 9144846
• Location on the vehicle: Rear
• Category: Wiring Harnesses, Cables & Connectors

Purpose and function in the vehicle

The described wiring harness is part of the Wires, harnesses, and connectors group, designed for operation in the rear body zone. It is responsible for transmitting signals and power between the trunk lid and the car's main electrical system, which is crucial for the operation of systems such as trunk lighting or other components located in this area.

Its location in the rear of the vehicle means that the cable is adapted to work in a zone exposed to trunk lid movement, bending, and temperature changes. The proper construction of the harness helps reduce the risk of chafing, circuit breaks, and related electrical faults.

Construction and advantages of using an original harness

As a component from the BMW range, the trunk lid wiring harness maintains factory geometry, length, and connector placement. This facilitates installation in the original mounting points without the need for modifications to the installation or the creation of additional cable sections.

Using an original harness instead of a damaged or unprofessionally repaired one allows you to:

• restore proper cable routing in the trunk lid hinge,
• minimize the risk of wire breakage during trunk opening and closing,
• maintain compliance with the vehicle's factory electrical diagrams,
• preserve aesthetics and order in the mounting space.

Condition, fitment, and installation aspects

The item is offered as a used OEM component, which in practice means maintaining the manufacturer's original specifications while offering an attractive cost-to-functionality ratio. For many users, this is a sensible solution when addressing typical wiring faults in the rear body section.

The harness is intended for installation in the rear zone of the vehicle, within the trunk lid area. Thanks to its factory fitment to the specific MINI R57 body structure, installation usually comes down to routing the cable through the original grommets and connecting the plugs into existing sockets, without the need for interference with the main electrical system.

Why it is worth using a dedicated trunk lid wiring harness

Using a dedicated trunk lid cable in the MINI R57 helps limit problems typical of makeshift repairs, such as unstable connections, installation errors, or intermittent power loss. The original harness ensures:

• consistency with the factory installation design – compliance with service documentation and electrical diagrams,
• reliability of connections – matched connectors and proper cable routing in the moving part of the body,
• easier diagnostics – the absence of additional, non-original connections makes it easier to locate potential faults in the future.

If you are planning a comprehensive repair or upgrade of the rear electrical zone in your BMW and need other components from the same group, such as additional harnesses, wires, or service connectors, check the available parts in the BMW Wires, harnesses, and connectors category.

For drivers interested in a broader approach to the maintenance and repair of vehicle electrical systems, a practical guide on choosing used parts may be helpful – more information can be found in the article When is it worth replacing an alternator with a used one: a practical guide for drivers.