BMW 1 F20 F21 Boot Trunk Lid Tailgate Wiring Harness Loom Cable 9357964

BMW 1 F20 F21 Boot Trunk Lid Tailgate Wiring Harness Loom Cable is an original electrical wiring harness designed to support the tailgate installation, engineered specifically for the 1 Series F20/F21 generation. Thanks to its factory design and precise fitment for the specific BMW model, it ensures consistency with the factory installation and stable electrical connections in a critical area of the bodywork. This is a practical solution for users who want to restore full functionality to the tailgate without compromising on quality.

Specifications and technical data

• SKU: 9357964
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 9357964
• Substitutable numbers: 61129357964, 9357964, BG
• Location on the vehicle: Front, Left
• Category: Other Air Conditioning & Heating

Purpose and function in the BMW 1 Series F20/F21

The presented BMW 1 F20 F21 Boot Trunk Lid Tailgate Wiring Harness Loom Cable is responsible for transmitting signals and power between the body and the tailgate. In practice, this means supporting components such as tailgate lighting, the lock, opening buttons, and other electrical components located in this area. Using a dedicated harness allows for maintaining the correct operation of comfort and safety systems without the need for installation modifications.

The positioning defined as front – left side indicates the specific routing of the wires within the body structure, which facilitates identification and component matching during installation. As a result, the installation is more predictable, and the risk of incorrect wire routing is minimized.

Construction and advantages of the original harness

The original BMW harness has been designed to operate in demanding conditions typical for the tailgate area – frequent movement, temperature changes, and exposure to moisture. The connectors and insulation used are matched to the factory sockets in the vehicle, which allows for:

• maintaining compatibility with the factory electrical installation,
• reducing voltage drops and signal interference,
• minimizing the risk of damage resulting from improper wire modifications.

Thanks to a design that complies with the manufacturer's standards, the harness represents a plug-and-play solution in terms of electrical connection – once the wires are properly routed and the connectors are plugged in, there is no need for additional installation adjustments.

Practical application in repairs and diagnostics

The tailgate wiring harness in the BMW 1 Series F20/F21 is a component particularly prone to mechanical damage, insulation abrasion, and wire breakage resulting from repeated opening and closing of the tailgate. Symptoms of problems in this area may include:

• intermittently working tailgate lighting,
• issues with electric opening or closing,
• random electrical system errors related to the rear part of the vehicle.

In such cases, using a complete, original harness is often a faster and more predictable solution than spot-soldering individual wires. This allows for restoring connection stability and minimizing the risk of recurring faults in the same area.

Condition, fitment, and brand

The offered component comes from BMW, which guarantees compliance with factory quality and construction standards for the 1 Series F20/F21. As a result, the original wire lengths, connector types, and harness routing geometry are preserved, which facilitates installation and reduces the time required for fitting in the vehicle.

Before installation, it is recommended to perform a standard verification of the vehicle's installation and compare the wire routing with the removed component to ensure full configuration compliance. This approach allows you to utilize the potential of the original harness and achieve stable operation of electrical systems within the tailgate area.

Expanding BMW installation upgrades

If you are planning a comprehensive repair or upgrade of the rear body zone in your BMW and need other elements from the same group, such as additional wires, connectors, or sections of the electrical installation, check out the available parts in the Other BMW category.

For a comparison of technical solutions used in different brands and equipment versions, as well as to better understand the differences in the construction of drive systems and their accompanying installations, it is worth reading the comparative material regarding sports models – you can find it in the article Audi RS vs other models – what is hidden under the hood and chassis?.