Electronics

Restore reliability to your E9x Headlights with ECS Tuning’s Premium Replacement Harness Kit.

Headlight electrical issues are a common headache for many E9x owners. Over time, the factory wiring inside Pre-LCI BMW E92 and E93 3 Series headlights, as well as all E9x M3 models equipped with factory Xenon adaptive lighting, tends to become brittle and crack. This well-known problem can lead to flickering lights, adaptive headlight malfunction warnings, or even internal shorts that cause costly damage. With genuine Xenon headlights becoming increasingly scarce, maintaining them has never been more important.

ECS Tuning offers a long-lasting solution with its Headlight Wiring Harness Repair Kit, engineered specifically to eliminate this failure point. Each harness is built from modern, heat-resistant materials and fitted with pre-terminated, OEM-style connectors for a clean, straightforward installation. The result is improved reliability and restored confidence in your lighting system.

Don’t wait until your lights fail or an adaptive headlight error appears. Replace your deteriorating factory harness with ECS Tuning’s upgraded repair kit and keep your lighting system performing as it should.

Key Features

Designed for Xenon Adaptive Headlights

OE-style fitment with enhanced insulation to resist cracking and heat damage

Complete set includes both left and right harnesses, plus integrated jump wire for full functionality

Detailed installation instructions provided for easy DIY installation

Fitment & compatibility:

All E90, E92, E93 M3
E92 Pre-LCI 328i, 328xi, 335i
E92 Pre-LCI 328i, 335i
Kit Contents:

Two headlight wiring harnesses (complete both left and right)
5x - heat shrink sleeves
18x - 22-24 gauge butt connectors
Product Development:

This headlight repair harness was developed, engineered, and quality-tested by ECS Tuning’s in-house Research & Development team. Every detail reflects ECS’s commitment to precision and durability, utilizing advanced tools and technology, including FARO laser scanning, SolidWorks 3D CAD modeling, in-house 3D printing for rapid prototyping, and long-term performance testing.

Installation & Support:

ECS Tuning provides a comprehensive installation guide that covers the entire process, from opening your OEM headlights to installing the new harness.

BMW E31 Headlight Wiring Harness is the ultimate replacement solution for all US Spec models of the BMW E31 platform. This complete pair, including both left and right headlight harnesses, is designed to restore functionality and reliability to your lighting system. Each harness is equipped with pre-installed connector plugs, eliminating the need for wire splicing or time-consuming modifications. It replicates the original BMW part with precision, ensuring a seamless fit and finish, despite being discontinued for years.

Constructed using top-grade materials and precision injection molding, this wiring harness offers unmatched durability and performance. If your vehicle's headlight wiring is compromised, it’s advisable to inspect and replace the lower FTP light strip wiring harness as well, as many BMW E31 models are prone to degradation in both components.

• Specifically engineered for all US Spec BMW E31 models
• Includes a complete set of left and right headlight wiring harnesses
• Plug-and-play installation with pre-installed connector plugs—no splicing needed
• Precision injection-molded construction ensures long-lasting reliability
• Perfect replica of the original OEM BMW part, no longer in production
• Fixes common issues caused by deteriorating or faulty headlight wiring
• Enhances the functionality and appearance of your headlight system
• Compatible with lower FTP light strip wiring harness for comprehensive repairs