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How to Replace Rear Door Lock Mechanism 04-09 Audi A4

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  1. step : Removing the Door Panel (0:47)
    • Remove the panel covering the battery
    • Disconnect the negative battery terminal with a 10mm wrench
    • Pry off the silver panel
    • Remove the three Phillips screws from the door panel
    • Remove the Phillips screw underneath the door pull
    • Pry out the door panel
    • Unlatch the door handle cable
    • Disconnect the window motor wiring harness
    • Disconnect the speaker wiring harness
    • Lift the door panel up and off
  2. step : Removing the Window Regulator (2:08)
    • Remove the three T25 Torx screws from the window motor
    • Pull the window module off the door
    • Disconnect the wiring harnesses from the module
    • Squeeze the clips on the regulator mount and push them through the door
    • Pull the wiring harness out
    • Pull the water shield up
    • Remove the T25 Torx screw
    • Pry off the sail panel
    • Remove the weatherstrip
    • Pry off the rubber boot
    • Remove the T45 bolts under the boots and the two atop of the door
    • Carefully remove the watershield
    • Remove the two T30 Torx bolts
    • Squeeze the white clip with pliers and push it through
    • Lift the window, window track, and regulator (one piece) up and out
  3. step : Removing the Door Lock Mechanism (5:50)
    • Remove the two M8 Torx bolts from the lock mechanism
    • Pull the lock mechanism up and out
  4. step : Installing the Door Lock Mechanism (6:18)
    • Insert the door lock mechanism into place
    • Tighten the two M8 Torx bolts to the lock mechanism
  5. step : Installing the Window Regulator (7:03)
    • Insert the regulator into place
    • Tighten the two T30 Torx bolts
    • Tighten the T45 bolts under the boots and the two atop of the door
    • Insert the weatherstrip back in place
    • Tighten the T25 Torx screw
    • Press the regulator transmission into place
    • Press on the two rubber boots
    • Press the sail panel into place
    • Put the water shield into place
    • Mount the window motor to the door
    • Tighten the three T25 Torx screws to the window motor
    • Connect the wiring harnesses to the window module
  6. step : Reinstalling the Door Panel (10:41)
    • Connect the speaker wiring harness
    • Connect the window motor wiring harness
    • Latch the door handle cable
    • Lift the door panel into place
    • Push in the door panel clips
    • Insert the Phillips screw underneath the arm rest
    • Insert the three Phillips screws from the door panel
    • Press on the silver panel with a flat blade screwdriver
    • Connect the negative battery terminal with a 10mm wrench
    • Replace the battery panel

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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 and reinstall the lock mechanism on the rear door on this 2007 Audi A4. Pretty much the same for any 2002 to 2009, and we're going to show you on the driver side, passenger side, is the same procedure. In fact, we do use some of the passenger side footage. Items you'll need are a 10 mm socket and ratchet, a Phillips screwdriver, a flat blade screwdriver, a T25, T30, and T49 Torx driver, as well as a M8 12 point Torx driver.

Disconnect your battery. On this car, there should be a panel on top that you take off a couple of fasteners and lift it up and off. Then a 10mm wrench, loosen and remove the battery cable.

Just pull this trim straight out and work your fingers under, and then it comes forward at the back. Four screws hold it in. There's one up under here and then one here, here, and here. A Phillips screwdriver will remove those. A little difficult. Sometimes you just have to feel for the screw once you have the right angle. There it is. We'll just fast-forward as we remove those fasteners.

Pull the door panel out and then your door handle cable here, just pull it out of the clip and then just unhook it. On the speaker there are two tabs that you push in, and then on this there's a tab on the backside that you have to push really firm with your finger and pull down. If any of the clips come out when you remove the panel, helps to use just a little glue and glue them back in.

Disconnect window module. Push the tab and pull down. Remove the three T25 Torx screws that hold the window motor in place. Pull the module off, and there's a tab on this one. Push the tab, pull it out, and on this one, you've got to push the tab underneath and pull it off.

Use needle nose pliers, and you need to push these three posts through. You squeeze the clips and push. Push that through. Pull this clip out. Go up and down and out, and then carefully pull your water shield up, and you want to remove this T25 Torx screw. Move this corner triangle piece just by pulling out firmly.

We have to remove the weather strip so just work your fingers back in, pull firmly, and on each end you need to remove the ends of these rubber hooks just like that. Just pull them out so they're loose. Remove this plug and then there's a similar one in the front.

There's another one in this hole here. Remove your water shield, and remove these two T30 Torx bolts. One here, and if you peel this down, one here. The little clip right here, just squeeze the teeth on it. Hold from the backside and squeeze the teeth. Push that through. Now, pull it form the rubber ends. This comes up.

Disconnect the lead right under here and press this tab. Sometimes it's helpful to use a flat blade screwdriver. Carefully press on the tab. Pull it off. There's a clip that holds the lock rod right here. Then remove these two M-8 12 point Torx screws. You pull it free, and then this plug here, you can just push through. Bring your cables down through, up and out.

Put it back down in place to reinstall. It will go down, then feed the cable up and through. Just to make sure that I don't get this caught up, I'll reconnect my harness. Align it back in its place.

Then put your rail down in in the frame. Make sure that your window, the bottom of your window regulator goes down and in, and then as it's going down you want to make sure that these stay out of the way. There's just a little piece of foam here to push in. It likes to get caught. Push it down.

I'm going to reinstall the 6 mounting bolts, the T30s that are on the ends, and then the 4 T45s. These hidden ones, you put them on your T45 bit. This front one, I'm going to pull the weather strip out and go in behind, start it. You don't want to tighten these up all the way because you may want to adjust your window later. We're just tightening them so they're firm and then we're going to back them out a little bit.

Weatherstrip back in place. Just going to bring it up into its groove and then push it in all the way around. Shut the door, check the alignment. You want to push it up, make it a little tighter. Go ahead and do that, and then you can tighten up those bolts the rest of the way.

Reinstall the T25 bolt that attaches the bottom of the regulator to the door. Now you want to reach in here and grab your regulator transmission and pull it into place.

Reinstall the two rubber plugs, glue on any weatherstrip that may have fallen down, and reinstall the triangle seal at the rear. Put a little extra glue on the top. Remount your window motor.

You just want to be careful not to push the transmission back through, so put it into place, line it up, and then before you push on it, start your bolts in. That way if you push it through you can grab the bolts and bring it back. Reattach the harnesses.

Just end up here, we'll kind of speed through putting the door panel back on. Pretty basic: reattach the harnesses, the cable, and put the panel back on and put the screws back in. If you needed to see this in more detail, just check out our other videos for the rear door panel for the Audi A4.

Press the rubber ends back in and reconnect your battery. Tighten it up with 10 millimeter wrench and then reinstall the panel that should be there.

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.

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

  • Star Drivers & Sockets

  • T30 Bit
  • T25 Driver
  • T40 Socket

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