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How to Replace Horn Passenger Side 07-16 GMC Acadia

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How to Replace Horn Passenger Side 07-16 GMC Acadia

Created on: 2016-10-12

How to repair, install, fix, change or replace a damaged, worn out, faulty or shorted horn on 12 GMC Acadia

  1. step 1 :Removing the Horn
    • Turn the wheel inward using the steering wheel
    • Remove the seven T20 Torx screws from the fender
    • Peel back the inner fender
    • Remove the eight plastic clips from the wheel well liner, if necessary
    • Pull out the wheel liner, if necessary
    • Disconnect the wiring harness from the horn
    • Remove the 10mm bolt from the horn bracket
    • Pull the horn down and out
  2. step 2 :Installing the Horn
    • Put the horn into place
    • Insert the 10mm bolt into the horn bracket
    • Connect the wiring harness to the horn
    • Put the wheel well liner into place
    • Insert the 8 plastic clip into the wheel well liner
    • Put the fender into place
    • Insert the seven T20 screws into the fender

Tools needed for replacement

  • Pliers, Cutters & misc Wrenches

    Side Cutters

  • Ratchets & Related


  • Screwdrivers & Related

    Flat Blade Screwdriver

  • Sockets - Metric

    10mm Socket

  • Star Drivers & Sockets

    T20 Driver

Installation Video
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Hi, I'm Mike from 1A Auto. We've been selling auto parts for over thirty years. We're dedicated to delivering quality auto parts, expert customer service, fast and free shipping, all backed by our 100% satisfaction guarantee. We've created thousands of videos to help you install our parts with confidence. That saves you time and money, so visit us at, your trusted source for quality auto parts.

In this video we're going to be working with our 2012 GMC Acadia. We're going to show you how to remove and replace the horn on the passenger side of your vehicle. If you like this video, please click subscribe, we have a ton of more information on this as well as many other makes and models. If you ever need parts for your vehicle, you can follow the link down on the description over to Here are the items you'll need for this repair.

This job can easily be done on the ground, but we're going to raise and support our vehicle to make it easier to film and show you what's going on. Turn your wheel in to whatever side you're working on. We're going to be working on the passenger side, so we'll cut our wheel all the way to the left. If you're working on the driver's side, you'll want to cut the wheel all the way to the right.

Remove the seven T20 Torx screws. We have two on the bottom here and five running up along the backside of the bumper and the fender. From this point we can peel the inner fender liner backwards just enough that you should be able to look inside and access the back of the housings.

We're going to remove the series of plastic clips from the inside to remove the front half of the inner fender just to make it easier to film and show you what you're looking for. Remove the eight plastic clips securing the inner fender wall in. We have three in the top area here, one over at the front in the middle, two down at the bottom, and these two at the back of the front portion of the liner at the bottom in the middle here. There's a few different ways to remove these style clips. I like to try to take a small flat blade screwdriver and work up the center part of the clip just a little. Once you get it up some, if you have the room to get in there with a pair of side cutters, you can sneak them underneath and then pry up evenly from both sides. Once the center's out, you can pop the lower portion out the same way. To remove the wheel liner pull out on the bottom portion here and pull down and pull forward to release the front half of the wheel well from the rear and sneak it out of the bottom.

Disconnect the electrical connector from the back of your horn. Remove the ten millimeter screw at the top of the bracket for the horn. We're going to do this with a socket and ratchet. Remove the assembly from your vehicle.

Install the horn. Line up the hole on the bracket and re-install the ten millimeter bolt. Then tighten it up with your socket and ratchet. Re-install the electrical connector.

Re-install your inner wheel well liner. You can do this by pushing it up from the bottom and rotating it in over the tire. Be sure that the top slides into place behind the rear liner as well as on the sides. Once you have some holes lined up, you can start installing your eight push pins. Set them up like this, install the bottom half and then pop the tab into place.

Re-install your seven T20 Torx screws. We'll start them a couple of threads by hand before we install them with our socket and ratchet.

Thanks for watching. Visit us at for quality auto parts, fast and free shipping, and the best customer service in the industry.

Tools needed for replacement:

    Pliers, Cutters & misc Wrenches

  • Side Cutters

  • Ratchets & Related

  • Ratchet

  • Screwdrivers & Related

  • Flat Blade Screwdriver

  • Sockets - Metric

  • 10mm Socket

  • Star Drivers & Sockets

  • T20 Driver

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