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How to Replace Door Lock Cylinder 03-07 Cadillac CTS

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  1. step : Removing the Door Panel (0:32)
    • Pry out the door handle bezel
    • Disconnect the door lock wiring harness
    • Pry off the trap door behind the door pull
    • Remove the two Phillips screws behind the trim piece
    • Pry off the trim lock on the door lock
    • Remove the door lock rod bezel
    • Roll the window all the way up
    • Pull out on the sides of the door panel
    • Pull the door panel off
  2. step : Removing the Interior Door Handle (1:52)
    • Remove the 10mm bolts from the interior door handle
    • Pull the handle forward and back
    • Rotate the handle off of the door latch rod
  3. step : Removing the Door Lock Cylinder (2:10)
    • Pull off the interior water shield
    • Release the door rod latch
    • Pull down on the snap ring securing the lock cylinder to the exterior door handle
    • Slide the lock cylinder out of the handle
    • Remove the lock cylinder from the rod
  4. step : Reinstalling the Door Lock Cylinder (2:53)
    • Connect the latch to the door lock cylinder
    • Insert the door lock cylinder into handle
    • Reconnect the door latch rod retainer
    • Re-adhere the weather shield
  5. step : Reinstalling the Interior Door Handle (3:30)
    • Insert the door latch rood to the interior door handle
    • Insert the handle into its slots
    • Slide the handle back to lock it into place
    • Tighten the 10mm bolt to the door handle
  6. step : Reinstalling the Door Panel (3:51)
    • Align the connector and the door panel
    • Lift the door panel into place
    • Press the door panel into the door
    • Clip in the door lock pull
    • Tighten the two Phillips head screws behind the door pull
    • Connect the door lock wiring harness
    • Snap on the trim bezel

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Hi, I'm Mike from 1A Auto. I hope this how-to video helps you out, and next time you need parts for your vehicle, think of Thanks!

In this video, we're going to show you how to remove the door lock cylinder in a 2006 Cadillac CTS.

Here are the items you'll need for this repair: 10mm socket, ratchet, socket extension, flat blade screwdriver, and a Phillips screwdriver.

Using a flat blade screwdriver, we've wrapped it in some tape here to keep it from scoring the interior. We want to pry out on this trim panel around the door handle. Release this little tab on the connector at the top. Remove that connector from the door lock switch. Using that same screwdriver, going to pop out this cover underneath the interior door handle here, so we can access these two Phillips head screws. Remove these two Phillips head crews with a number 3 screwdriver. Using a small flat blade screwdriver, pop out this tab on the door lock, and remove it from the door lock rod. Make sure that your window is rolled up. Simply pull out on the panel now. Release it from the door.

Using a 10mm socket and ratchet, remove the bolt from the back of the interior door handle. Pull forward and back to release the handle from the door. Rotate it off of the hook for the door latch rod. Remove the interior water shield. Release this latch from the door rod, allow that to hang out of the way.

Using the hook pick, pull down on the snap rings securing the lock cylinder into the exterior door handle. Release it. Slide the lock cylinder back out of the handle.

Remove the lock cylinder from the latch rod, install your new door lock cylinder onto the latch rod.

Reinstall the door lock cylinder into the exterior door handle. Reconnect the retainer for the door latch rod, and check for operation. Reinstall the two 10mm nuts on the back of the exterior door handle. Tighten them down with the 10mm socket and ratchet.

Re-adhere the weather shield to the inside of the door skin. Insert the hook into the grommet on the interior door handle. Pull out, and set it into its holes. Push back to lock it into place, and reinstall the 10mm bolt.

Be sure to align the connector here and the door panel. Line it up. Make sure that the door lock rod is pulled up. Snap all the retainers back into place.

Install the door lock pull. Clip it back in. Reinstall the two Phillips head screws behind the door handle. Snap the plastic cover back into place. Reinstall the connector for the door lock switch. Pull out on the door handle. Set the trim on. Snap it in.

Thanks for tuning in. We hope this video helped you out. Next time you need parts for your car, please visit Also check out our other helpful how-to and diagnosis videos.

Tools needed for replacement:

    Ratchets & Related

  • Ratchet
  • Socket Extensions

  • Screwdrivers & Related

  • Phillips Head Screwdriver
  • Flat Blade Screwdriver

  • Sockets - Metric

  • 10mm Socket

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