BMW 3 Series E46 Cable Harness Wiring Loom Door Rear Left / Right N/O/S 8378337

BMW 3 Series E46 Cable Harness Wiring Loom Door Rear Left / Right is an original, used electrical installation component designed for installation in the rear doors on either the left or right side. Thanks to its factory fitment for this specific 3 Series generation, it ensures consistency with the vehicle's original wiring and a stable connection for all door-mounted components. It is a practical solution for post-collision repairs, door replacements, or troubleshooting electrical faults.

Specifications and technical data

• SKU: 8378337
• Mark: BMW (Genuine OE)
• Condition: Used
• OEM Part Number: 8378337
• Substitutable numbers: 61128378339, 8378339, 8378337
• Location on the vehicle: Rear, Right, Left
• Category: Wiring Harnesses, Cables & Connectors

Purpose and vehicle placement

The presented wiring harness is a component from the Wires, harnesses, and connectors group, designed specifically for the rear body section of the BMW 3 Series E46. Its adaptability for installation on both the left and right sides of the rear body allows it to be used in various repair scenarios – from replacing a single door to more extensive service work within the electrical system.

Its placement in the rear door area means the harness is responsible for transmitting signals and power to components mounted in the doors, such as control modules, actuators, or lighting, ensuring their proper interaction with the rest of the vehicle's electrical system.

Benefits of using an original BMW wiring harness

Using an original door wiring harness in the BMW 3 Series E46 allows you to maintain the vehicle's factory electrical architecture. Proper wire lengths, correct connectors, and compatibility with the body wiring reduce the risk of communication issues between modules and minimize the need for modifications.

• Full compatibility with the electrical system of the dedicated BMW model.
• Proper wire routing within the rear doors, in accordance with the manufacturer's specifications.
• Simplified installation thanks to factory connectors and mounting points.
• Can be used for rear door replacements on either the left or right side.

This used OEM component is a sensible choice for repairs where maintaining original functionality while controlling service costs is a priority.

Service application and repair scenarios

The BMW 3 Series E46 Cable Harness Wiring Loom Door Rear Left / Right is particularly useful in situations where wires in the door grommet have been damaged, contacts have corroded, or the installation has been mechanically severed during panel replacement. Using a complete harness instead of point-to-point wire repairs helps limit potential issues with connection resistance and future fault diagnosis.

This component is suitable both for workshops specializing in the BMW brand and for users servicing their own cars who expect a reliable, factory-grade solution rather than makeshift wiring repairs.

Integration with other BMW electrical components

When working on the rear body section, it is worth planning service work comprehensively, covering the entire power and signal line in the doors. If you are planning a complex repair or upgrade of the rear door zone in your BMW and need other components from the same group, such as additional wire sections, adapter harnesses, or service connectors, check the available parts in the BMW Wires, harnesses, and connectors category.

Summary

BMW 3 Series E46 Cable Harness Wiring Loom Door Rear Left / Right is a practical, original electrical installation component designed for installation in the rear doors on either the left or right side. It enables the restoration of proper operation for door-mounted components, maintains consistency with the factory installation, and reduces the risk of problems resulting from unprofessional wire modifications. It is a sensible choice for body and electrical repairs in the 3 Series E46, especially where compliance with the manufacturer's solutions is essential.