The Ultimate Guide: Installing GTS OLED Taillights on Your G80 M3 & G20 3 Series

G80 M3 & G20 3 Series Sequential OLED GTS style taillights (2019 - PRESENT)

Transform the rear of your BMW G80 M3 or G20 3 Series with the single most impactful visual upgrade available: GTS-style OLED Taillights. These complete assemblies replace your stock LED taillights, introducing the stunning, intricate design inspired by the legendary M4 GTS.

Featuring cutting-edge OLED technology, a dynamic startup sequence, and brilliant sequential turn signals, this upgrade completely modernizes your car's aesthetic. This guide will give you the confidence to install them yourself.

Table of Contents

  • Is This Mod Right for You? (Skill, Time)

  • Tools & Parts Needed

  • Step-by-Step Installation Guide

  • The Final Result

  • Frequently Asked Questions (FAQ)

Is This Mod Right for You?

  • Skill Level: Beginner / Intermediate. This is a very straightforward installation with basic tools.

  • Time Estimate: 1 - 1.5 hours.

Tools & Parts Needed

Required Tools:

  • Plastic Trim Removal Tool

  • Ratchet with a 6-inch extension

  • 8mm and 10mm Deep Sockets

  • Small Flathead Screwdriver (for clips)

Required Parts:

Step-by-Step Installation Guide

The installation is broken into two parts: the larger outer taillights on the quarter panels and the smaller inner taillights on the trunk lid.

Part 1: Outer Taillight Installation (Quarter Panel)

  1. Open Trunk & Access Liner: Open your trunk. On the side you're working on, locate the small access panel in the trunk liner directly behind the taillight. Use a trim tool to pop it open.

  2. Unplug the Wiring Harness: Reach inside the access panel and locate the main wiring harness connecting to the taillight. Press the release tab and pull firmly to disconnect it. [Image showing a hand unplugging the main connector behind the trunk liner]

  3. Remove Mounting Nuts: Using your ratchet, extension, and 8mm socket, remove the three nuts securing the taillight to the chassis.

  4. Install the New Outer Taillight: Carefully push the old taillight out from the inside. Guide your new BayOptiks GTS OLED Taillight into place, ensuring the mounting studs and alignment pin are seated correctly. Hand-tighten the three 8mm nuts, then snug them up with your ratchet. Do not overtighten. Reconnect the main wiring harness.

Part 2: Inner Taillight Installation (Trunk Lid)

  1. Remove Trunk Lid Trim: Use your trim tool to carefully pop out the plastic push-clips holding the main trunk lid liner in place. Once the clips are out, the liner can be pulled away to expose the back of the inner taillights.

  2. Disconnect and Remove: The inner taillight is held on by a single 10mm nut. Unplug its wiring connector, remove the nut, and the unit will come free.

  3. Install the New Inner Taillight: Place the new OLED inner taillight into the trunk lid, secure it with the 10mm nut, and plug in the wiring harness.

Step 4: Test All Functions

Before reinstalling all the trim panels, test every function. Have a friend help you check the running lights, brake lights, sequential turn signals, and reverse lights on both sides to ensure everything is working perfectly.

Step 5: Reassemble

Once you've confirmed everything works, reinstall the trunk lid liner and the side access panels.

The Final Result

The deep, uniform red of OLED technology combined with the intricate 3D design and dynamic animations completely elevates the look of your BMW, giving it a modern, high-end, and aggressive appearance.

[Stunning before-and-after slider image showing the stock G20 taillights vs. the new GTS OLED taillights]

Ready for the Ultimate Rear-End Transformation?

This plug-and-play taillight set is the best way to modernize your G80 M3 or G20 3 Series.

Frequently Asked Questions (FAQ)

  • Are these plug-and-play? Yes, 100%. They are designed to use the factory mounting points and wiring connectors with no modifications needed.

  • Will these throw any error codes? No. These taillights are designed to be error-free and work seamlessly with your car's electrical system.

  • What is the difference between LED and OLED? OLED (Organic Light Emitting Diode) technology allows for a much more uniform, vibrant light without hotspots. It also enables more complex designs and animations, creating a more premium look than traditional LEDs.

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