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How to Replace Door Lock Actuator 02-06 Chevy Trailblazer

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How to Replace Door Lock Actuator 02-06 Chevy Trailblazer

Created on: 2011-05-24

Check out this video to learn how to replace the door lock actuator on your 02-06 Chevy Trailblazer, or GMC Envoy.

  1. step 1 :Removing the Door Panel
    • Pry off the window switch with a flat blade screwdriver
    • Disconnect the window switch wiring harnesses
    • Undo the door handle bezel tabs with a flat blade screwdriver
    • Pull off the door handle bezel
    • Disconnect the door lock wiring harness
    • Remove two 10mm bolts from the door pull
    • Pry the door panel off by hand
  2. step 2 :Removing the Door Handle
    • Remove the 10mm bolt from the door handle
    • Pull the door handle forward and out
    • Carefully peel back the water shield
    • Undo the latch rod clips by hand
    • Push the latch rods up and off
    • Pull the lower latch rod clips off
  3. step 3 :Removing the Lock Mechanism
    • Disconnect the lock rod from the blue clip
    • Undo the yellow clip from the lock rod
    • Remove three T30 Torx bolts from the door
    • Pull the lock mechanism out of the door
    • Disconnect the wiring harnesses
  4. step 4 :Disconnecting the Door Lock Actuator
    • Pry off the lock mechanism strap
    • Remove three T10 Torx screws from the lock mechanism
    • Twist and pull out the lock rod
    • Push the actuator arm down and out of the lock mechanism
    • Separate the lock actuator from the lock mechanism
  5. step 5 :Reconnecting the Door Lock Actuator
    • Push the actuator shoe into place
    • Twist the actuator into place
    • Attach the actuator lock rod into the lock mechanism
    • Start the three T10 Torx screws by hand
    • Tighten the T10 Torx screws
    • Put the lock mechanism strap on, starting on the actuator side
    • Insert the grooved end of the lock rod into the lock mechanism
  6. step 6 :Inserting the Door Lock Mechanism
    • Thread the latch rods through their cavity
    • Attach the green wiring harness to the top of the actuator
    • Attach the gray wiring harness to the top of the lock mechanism
    • Attach the blue wiring harness to the bottom of the lock mechanism
    • Push the lock rod onto its clip
    • Push the lock mechanism into place in the door
    • Start the three T30 Torx screws by hand
    • Push the latch rods on to their lower clips
    • Tighten the T30 Torx screws
    • Connect the lock rod to the blue clip
    • Connect the lock rod to its lower yellow clip
    • Carefully put the water shield back on
  7. step 7 :Reinstalling the Door Handle
    • Reconnect the latch rods to the door handle
    • Push the door handle in and slide it back
    • Insert the 10mm bolt for the door handle
  8. step 8 :Reinstalling the Door Panel
    • Put the panel into place
    • Connect the door lock wiring harness
    • Push the door handle bezel into place
    • Insert the two 10mm bolts into the door pull
    • Connect the power window switch wiring harness
    • Push the power window switch into place
    • For more detailed instructions, please see the 2004 Trailblazer door panel replacement video

Tools needed for replacement

  • Ratchets & Related

    Socket Extensions


  • Screwdrivers & Related

    Flat Blade Screwdriver

  • Sockets - Metric

    10mm Socket

  • Star Drivers & Sockets

    T10 Torx Driver

    T30 Driver

Installation Video
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Brought to you by, your source for quality replacement parts and the best service on the Internet.

Hi, I'm Mike Green. I'm one of the owners of 1A Auto. I want to help you save time and money repairing or maintaining your vehicle. I'm going to use my 20-plus years experience restoring and repairing cars and trucks like this to show you the correct way to install parts from The right parts installed correctly: that's going to save you time and money. Thank you and enjoy the video.

In this video, we're going to show you how to remove and put back in a door lock actuator, the driver's side front on the 2004 Trailblazer, same as any '02 to '09 Trailblazer, Envoy, Bravada, Rainier, Saab 97X as well as Isuzu Ascender. Tools you'll need are small and a medium flat blade screwdriver, 10mm socket with a ratchet and extension, a T10 Torx driver and T30 Torx bit with a ratchet.

Start with a regular screwdriver, put it up under, quick little pry. Do the same thing over here. Okay, pry that up, you can see it just has two clips, front and back. Then you want to turn it over here and you want to unplug all of these harnesses. You basically just have a little thumb tabs, pull them up, okay skip that one, this one pulls out fairly easy. Now use your screwdriver, just pry that up a little bit and get that off. Then over here, screwdriver on this tab. Pry it up a little bit and it will come right out. This comes out. Around your door handle here, you're going to see some little tabs or little slots, you can insert a small screwdriver, push down with your screwdriver and then pull out with your hand, work your hand underneath, another tab right back here, push down, pull out and then there's a couple up top. Those ones you push up. There's one more right here. Okay, this whole thing comes out and if you have the memory seat and everything, you can now pull this whole harness right up and out.

There are two 10mm bolts: one there and then one way down in there. Use a 10mm socket with an extension and a ratchet. This one's really easy to get to. Okay, pull it up and out. This one, I'm going to start it. Do as much as I can, okay I just felt it fall, which is okay. Once you have those out, then you can start up here with your hand, just work it underneath this triangle, pull out and then just work your hand under the door panel and it will get harder and harder to slide under. You just pull, okay, and keep working your hand under, pull, work your hand under, and pull. Actually, here's my bolt from that armrest. Work our hand under and pull out and your door panel comes off.

For your inside door handle, there's a 10mm bolt right here. Remove that. Now I'm going to pull it forward and it comes out. Now in behind here, there's a little clips, you pull the clip off the rod then push the rod up. Another one down here, pull the clip off, push the rod up. You'll want to pull them out of these clips here.

Now inside, you're going to want to disconnect this lock rod here; there's a blue clip. Push up on the clip, and then pull that rod out. Right down here, you have this clip on here, you just pull that clip off and this rod comes out. T30 Torx bit, you need the style that you can put a ratchet handle on. Remove these three T30 Torx bolts here. We'll just speed this up as I remove those three bolts. So, now your whole locking mechanism comes out, and you can hopefully, unplug here, unplug here, unplug here, pull your mechanism down and out.

First you want to remove this strap here. Basically, I've got a T10 Torx driver is what I'm using and pry one side up and take it off. Then there are T10 Torx screws. We'll speed it up here as I remove those three screws. You'll want to pull this rod, which you'll have to twist it and then pull it out. Then this comes out of this arm, down and out. Then your actuator comes off like that.

Now this actuator is actually in fine shape, so I'm just going to put it back together. You want to put . this has a little, it's kind of like a shoe . you put the top in and then twist the actuator down. Now you have to get the gears, right here, to mesh and you can do that. You're just going to put this in, clip it into place. Again I'll use the fast forward button as we just hand thread those three bolts in or screws in and then tighten them up nice and snug. For this strap, it's easiest if you put this side on first and then you just want to push it right down. Then, this rod goes in the side that has this little groove cut in it, it just snaps right it there.

So you have your assembly. You want to put these two rods right up in through here and then have them come out this hole here. Now you want to connect all these: green goes on top, grey here and blue on the bottom. This rod goes inside this harness here. Put your assembly in. You should move over to the side a little bit. Now grab one of your Allen screws. Just make sure your handle rod doesn't get in the way, make sure it's hanging down free and start to push it up in place so you can see your latch here. Start one of your screws. We'll speed it up here as I just start those other two Torx screws. Okay, put these into place. Tighten these up. You want to tighten those up nice and firm, they don't have to be extremely tight but they should be good and firm. Okay so you're going to want to take your lock rod, make sure it's on the outside of this rod, I don't know if you can see me moving that right through here. Okay. Then clip it in and then put that clip on. Okay. Now right in here, put our handle rod in and lock that clip on. Now we can put our water shield back up in place. One thing you want to make sure is this pull right here is nice and clear. Re-installation is just a reverse. Push the rod over, clip on, pull the rod over, push it down, clip it on, and push the handle in, and slide it back. Here's a 10 millimeter bolt. Now, I'm going to fast forward through putting the door panel back on. It's just in the interest of keeping the video a little bit on the short side. Once you get it off, it's pretty easy to get back on. If you do want to see this in real speed or regular speed, just check out our other videos for the Trailblazer front door panel remove and replace.

We hope this helps you out. Brought to you by, your source for quality replacement parts and the best service on the Internet. Please feel free to call us toll-free, 888-844-3393. We're the company that's here for you on the Internet and in person.

Tools needed for replacement:

    Ratchets & Related

  • Socket Extensions
  • Ratchet

  • Screwdrivers & Related

  • Flat Blade Screwdriver

  • Sockets - Metric

  • 10mm Socket

  • Star Drivers & Sockets

  • T10 Torx Driver
  • T30 Driver

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