How to Replace HID Headlight Ballast 2007-16 GMC Acadia

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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 your HID ballast for the outer hi/low headlight bulb.

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Here are the items you'll need for this repair: T20 Torx socket, ratchet, 10mm socket, socket extension, flat blade screwdriver, and side cutters.

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.

Unclip the tabs that secure the floor mat. You only really have to undo these two. Then you can just fold it over and out of the way. This cover is where your battery is located. To get it out more easily, you'll want to lift up and snap this plastic cover off of the seat rail. Remove this T-20 Torx screw here. We're going to do that with a Torx socket, ratchet, and extension. Remove the screw from the cover. Lift the cover up and away. Remove the negative side of the battery with a 10mm socket ratchet and extension. Remove the terminal from the battery and place it out of the way.

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. Remove the eight plastic clips securing the inner fender well 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 forward to release the front half of the wheel well from the rear and sneak it out of the bottom.

Remove the two T20 Torx screws securing the ballast into the bottom of the headlight. We'll do this with a Torx bit and a ratchet. Now these ballasts are high voltage, so make sure that the battery is disconnected and the key is out before touching this portion of the ballast. We'll then take a flat blade screwdriver and carefully pry out. You should only have to do a little on each side before it releases. Simply slide it back and remove the ballast from the headlight.

Install the ballast. Push it in fully. Make sure that it is all the way seated, because you don't want to pull it in with the screws, otherwise it may go in crooked and cause that little board to break. Once it's slid in and flush, you can reinstall your two T20 Torx screws. These screws are only going into plastic, so you just need to get them snug. You don't want to make them go too tight or you risk stripping out the bottom of the headlight housing where it threads in. Then you'll have to replace the entire assembly.

Reinstall your inner wheel well liner. 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. Reinstall your seven T20 Torx screws. We'll start them a couple of threads by hand before we install them with our socket and ratchet.

Keep your keys handy in case this sets off your vehicle's car alarm, and reconnect the negative side of the battery. Tighten up the 10mm bolt. Reinstall the cover, and tighten down your T20 screw. Put the plastic cover back onto the seat rail. Snap it into place. Lay your floor mat back down. Reengage the hold downs.

Thanks for watching. Visit us at 1AAuto.com for quality auto parts, fast and free shipping, and the best customer service in the industry.

How to Replace HID Headlight Ballast 2007-16 GMC Acadia

step 1 :Disconnecting the Battery

step 2 :Removing the Wheel Well Liner

step 3 :Removing the Headlight Ballast

step 4 :Installing the Headlight Ballast

step 5 :Installing the Wheel Well Liner

step 6 :Reconnecting the Battery

Tools needed

Wheel Bearings on Cars and Trucks Sealed Bearing vs Adjustable Bearing

How to Replace HID Headlight Ballast 2007-16 GMC Acadia

step 1 :Disconnecting the Battery 1:22

step 2 :Removing the Wheel Well Liner 2:29

step 3 :Removing the Headlight Ballast 4:38

step 4 :Installing the Headlight Ballast 5:24

step 5 :Installing the Wheel Well Liner 6:04

step 6 :Reconnecting the Battery 7:23

Tools needed

Wheel Bearings on Cars and Trucks Sealed Bearing vs Adjustable Bearing

step 1 :Disconnecting the Battery

step 2 :Removing the Wheel Well Liner

step 3 :Removing the Headlight Ballast

step 4 :Installing the Headlight Ballast

step 5 :Installing the Wheel Well Liner

step 6 :Reconnecting the Battery