BMW E87 LCI E90 118i 318i N43 Wiring Loom Harness Automatic Gearbox 7570552

The BMW E87 LCI / E90 118i 318i N43 Automatic Transmission Wiring Harness is an original part from the Cables, Harnesses, and Connectors group, designed to work with the automatic transmission in the N43 engine. Factory-designed for specific BMW models, it ensures proper signal routing between the control unit and the transmission components, contributing to stable powertrain operation.

Specifications and technical data

• SKU: rhd-7570552
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 7570552
• Substitutable numbers: 12517570552, 7570552, KZ
• Gearbox type: Automatic
• Category: Wiring Harnesses, Cables & Connectors

Purpose and Compatibility

This electrical wiring harness is dedicated to BMW 1 Series E87 LCI and 3 Series E90 models in 118i and 318i versions with the N43 engine, equipped with an automatic gearbox. The design with appropriately placed connectors and wire routing allows for installation in original mounting points without the need for electrical system modifications.

Factory connectors and wire gauges are adapted to the loads and operating conditions in the engine bay, which reduces the risk of signal interference and communication problems between the transmission control unit and other vehicle modules.

Function in the Powertrain

The harness is responsible for transmitting control signals and feedback information between the automatic transmission and the vehicle's electronics. A properly functioning electrical system in this area is crucial for:

• precise gear changes and smooth automatic operation,
• correct functioning of driving modes and transmission protection features,
• stable communication with the engine control unit and other modules.

By maintaining the original wiring architecture, it is possible to preserve the factory powertrain operating parameters without compromising reliability.

Product Characteristics and Condition

The offered harness belongs to the BMW Cables, Harnesses, and Connectors group and comes from disassembly, meaning it is a used part but retains the functionality required for further operation. Original connectors, insulation, and wire routing are adapted to the specific working conditions around the automatic transmission, where elevated temperatures and vibrations occur.

Choosing an original harness from disassembly is often a cost-effective solution for electrical system repairs, as it maintains compliance with factory specifications and avoids problems typical of universal replacements, such as ill-fitting plugs or incorrect wire lengths.

Benefits of Using an Original Harness

Using this harness in a BMW E87 LCI or E90 with an N43 engine and automatic transmission allows for:

• restoring the factory wiring path without interfering with the vehicle's original harness,
• maintaining compatibility with factory control units and sensors,
• reducing the risk of communication errors and transmission limp mode,
• speeding up service work thanks to matched connectors and wire lengths.

For workshops specializing in the BMW brand and owners who care about the technical integrity of their vehicle, choosing an original harness is a particularly practical solution.

Completing the Electrical System in BMW – Cables and Harnesses

If you are planning a comprehensive repair or upgrade of the transmission's electrical system in your BMW and need other parts from the same group, such as additional harnesses, wire sections, or service connectors, check the available parts in the BMW Cables, Harnesses, and Connectors category.

For car owners who are simultaneously upgrading the vehicle's interior and want to improve driving ergonomics, a guide on selecting seats from disassembly may be helpful – find more information in the article Interior Makeover: How Branded Used Seats Improve Comfort and Car Value.