BMW 1 3 Series E87 E90 Front Seat Wiring Loom Harness Cable 9131745

BMW 1 3 Series E87 E90 Front Seat Wiring Loom Harness Cable is an original electrical installation component designed for installation in the front section of the vehicle. As part of the Wires, harnesses and connectors group, it ensures a proper electrical connection between the seat and the body wiring, which translates into stable operation of comfort and safety functions. This used OEM BMW component is a solution that allows for a technically correct repair without interfering with the factory installation architecture.

Specifications and technical data

• SKU: 9131745
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 9131745
• Substitutable numbers: 9131745, 9131561, KZ
• Location on the vehicle: Front
• Category: Wiring Harnesses, Cables & Connectors

Purpose and function in the vehicle

The presented BMW 1 3 Series E87 E90 Front Seat Wiring Loom Harness Cable operates in the front area of the vehicle, supporting electrical connections for the driver or passenger seat (depending on the car configuration). This component is responsible for transmitting signals and power to modules and sensors located in the seat, which is important for, among other things, comfort systems, passive safety, and communication with the body electronics.

Thanks to its factory fitment for the E87/E90 platform, the harness maintains the correct length of sections, connector placement, and mounting points, which facilitates installation and reduces the risk of wire tension during operation.

Construction and advantages of using an original harness

The harness belongs to the Wires, harnesses and connectors group, meaning it was designed as an integral part of the BMW electrical installation. The use of original connectors, wire gauges, and factory covers allows for:

• maintaining compatibility with factory sockets in the seat and under the floor,
• reducing voltage drops and signal interference thanks to a properly selected wire structure,
• maintaining compliance with the vehicle's factory electrical diagrams.

The used OEM BMW component is particularly beneficial for post-accident repairs, replacing a damaged seat, or repairing mechanical damage to the installation under the seat, where it is required to restore the original wire routing without cutting and soldering.

Benefits of using an original BMW component

Using this harness in BMW 1 and 3 Series E87/E90 models allows for a technically correct restoration of the factory installation. Key advantages include:

• Factory fitment – the harness was designed specifically for the front interior section of these models, which minimizes the risk of installation errors.
• Consistency with vehicle electronics – original connectors and wire layout promote seamless cooperation with control modules and diagnostic systems.
• Operational safety – the lack of need for installation modifications reduces the risk of subsequent faults, short circuits, or communication problems between modules.

For workshops and users who value compliance with BMW service documentation, using an original harness is a more predictable solution than installing universal or self-modified components.

Condition and service application

The component is offered as a used BMW part, which allows for an economical repair while maintaining the manufacturer's original specifications. This type of harness is particularly useful in situations where:

• mechanical damage to the wires under the seat has occurred (e.g., after a collision or improper disassembly),
• intermittent errors related to seat communication with the body installation occur,
• it is necessary to replace the seat with another one that requires a complete, factory harness.

Proper selection of the component for a specific vehicle configuration allows for reducing diagnostic and installation time, and also reduces the risk of repeated interference with the installation.

Additional information and related categories

If you are planning a comprehensive repair or upgrade of the interior zone in your BMW and need other elements from the same group, such as additional wire sections, passenger seat harnesses, or floor installation connectors, check the available parts in the BMW Wires, harnesses and connectors category.

For a better understanding of how the installation works within the steering column and related electrical components, you can use our guide material: Steering system and power steering – how it works and what fails?, which helps organize knowledge about the cooperation of mechanics and electronics in modern vehicles.