Thank you for your purchase of this unique product for your GMC Sierra! With these HD LED Halos for the 2016-2018 GMC Sierra 1500, you will gain a much brighter, more uniform appearance compared to factory LED boards. These computer-designed LED Halos are circuit boards that align perfectly behind the factory diffusing reflector. Available in switchback and amber-only, both versions also function as an additional front turn signal for a custom, yet functional look!
Please note: Headlights must be opened before proceeding with installation. Professional installation is strongly recommended. Please contact us if you need assistance locating an installer, or use our dealer locator tool to find an installer near you.
Check out our installation video below, and continue reading for step-by-step instructions!
Table of Contents
Installation Tools
- Phillips Screwdriver
- Double-Sided Adhesive or Epoxy
Installation Video
Installation Instructions
Step 1 - Remove HID Ballast.
Before opening the headlight, remove the three Phillips screws holding the HID ballast in place and four Phillips screws around the edge of the headlight. Then remove the HID ballast.
Step 2 - Remove Silver Bezel.
After the headlight has been opened, remove the four Phillips screws holding the silver bezel in place. Remove the silver bezel and set it aside on a soft surface.
Step 3 - Remove Factory Optic.
Remove the four Phillips screws holding the factory optic assembly in place. Then remove the factory optic assembly and disconnect the two factory board connectors. These connectors will not be reused, so tuck them out of the way.
Step 4 - Reinstall Factory Optic.
Reinstall the factory optic assembly using the original screws.
Step 5 - Position HD LED Halo.
Place your new LED Halo on top of the factory optic assembly. We recommend using either double-sided adhesive or epoxy to adhere the halo to the factory optic assembly. Be sure to place whatever adhesive you choose evenly around the halo to ensure secure placement.
Step 6 - Route Wires.
Route the wire outside of the headlight, sealing any holes you may create. Reinstall the silver bezel using the original screws. Repeat the process for the other headlight.
Wiring Instructions
Step 7 - Connect HD Halo.
Connect the halo connector to the Switchback driver output. Connect the Switchback driver input to the pigtail. Tap the pigtail wires to the wiring harness. See the Wiring Method Diagram below. The black wire must be grounded before any function will work.
IMPORTANT: DO NOT plug the LED panel directly into the pigtail without the driver. The LEDs must be plugged into the driver first to control the power.
Step 8 - Mount Driver.
Mount the driver and tuck all wires. Driver should be mounted outside of headlight for serviceability, in a location away from the engine block to avoid excessive heat buildup.
Step 9 - Reinstall Headlight.
Test thoroughly, reseal the headlight, and reinstall onto the vehicle.
Questions About the Installation?
If you have any questions or issues installing HD LED Halos in your 2016-2018 GMC Sierra 1500, please contact us for further information.
Where Can I Buy HD LED Halos for the 2016-2018 GMC Sierra 1500?
If you’re ready to upgrade your 2016-2018 GMC Sierra 1500 with HD LED Halos, you can purchase one by clicking here or using our dealer locator to find a dealer near you.
Want to know more about Diode Dynamics products? Visit DiodeDynamics.com and subscribe to our newsletter for new product releases and more!
This Installation Guide is for the following SKUs: DD2240, DD2177.
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