14-18 GMC Sierra X3B LED Third Brake Light

Morimoto X3B LED Third Brake & Bed Light – 2014-2018 GMC Sierra

Upgrade your 2014-2018 GMC Sierra with the Morimoto X3B LED Third Brake & Bed Light (X3B45), a premium lighting upgrade designed to combine modern styling, powerful brake-light performance, and improved truck-bed illumination.

The X3B replaces the outdated factory third brake light with aggressive 3D red LED brake light optics housed inside a sleek piano-black polycarbonate housing. Its modern design gives the rear of your Sierra a clean, high-end appearance while delivering outstanding lighting performance.

Four high-output brake light optics powered by powerful 3W LEDs produce bright, crisp illumination for enhanced visibility during both daytime and nighttime driving. For enthusiasts looking for an even more distinctive setup, the X3B is compatible with Morimoto's optional F1-style rapid flash module (X3B01).

More than just a brake light upgrade, the X3B features integrated rail-style LED bed lights. These purpose-built clear optics are engineered to distribute light evenly throughout the truck bed, helping eliminate dark spots and providing excellent visibility when loading, unloading, or accessing your cargo after dark.

Installation is completely plug-and-play. The X3B utilizes the original factory mounting locations and connects directly to the stock wiring harness, requiring no cutting, splicing, or permanent modifications.

Features

• Designed for 2014-2018 GMC Sierra
• Morimoto part number: X3B45
• Modern 3D red LED brake light optics
• Four high-intensity brake light optics
• Powerful 3W LEDs
• Integrated clear LED bed illumination
• Purpose-built rail-style bed optics
• Designed to help eliminate dark spots in the truck bed
• Sleek piano-black polycarbonate housing
• Compatible with optional F1-style rapid flash module (X3B01)
• Plug-and-play installation
• Uses original factory mounting locations
• Connects directly to the stock wiring harness
• No cutting, splicing, or modifications required
• DOT and SAE compliant
• Backed by Morimoto's 5-year warranty

Give your GMC Sierra a cleaner, more modern appearance while improving brake-light visibility and truck-bed illumination with the Morimoto X3B LED Third Brake & Bed Light.

Technical Specifications

• Input: GM Multi-Pin OEM
• Housing: Piano Black Polycarbonate
• Lens: UV-Resistant Clear Polycarbonate
• Bed Light: White (3W)

What's Included

• Third Brake Light: 1x Morimoto X3B LED Module (14-18 Chevrolet Silverado)
• Wiring: Plug and Play Adapter Harness
• Warranty: Five (5) Years

Compatibility

• Chevrolet Silverado 1500/HD: 2014-2018
• Replaces GM Part #: 23509162, 20979071
• NOTE: The unlock feature of the factory light is not retained.
• NOTE: These housings have been designed for, and tested on, US-Spec vehicles. Other countries' compatibility may vary and is not guaranteed nor always known.

Installation Guide

Product Video