Disassembling Mercedes W123 Door Panel

Member-Contributed Guide

Member-Contributed Guide

An awesome member of our community made this guide. It is not managed by iFixit staff.

In order to work on several items within the door of a W123, such as window regulator or door lock vacuum actuators, the door panel will need to be removed for access.

In order to repair items such as your window regulators or door lock vacuum actuators, and to properly lubricate your lock mechanisms, you will need to pull your door panel. This is not difficult, but there are some little tricks and "hidden" screws that can make it challenging the first time. Learn to properly remove your panel with this guide. This will allow you to easily move on to the more important projects lying behind the panel.

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Edit Step 1 Door Panel  ¶ 

  • Being by removing the door lock knob. It unscrews counter-clockwise.

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Edit Step 2  ¶ 

  • Remove the two screws that attach the chrome trim around the door latch. The chrome trim will come loose afterwards. Set aside.

  • Note: the screws shown are not original. Phillips head screws are the original equipment. These are 2.5mm allen head screws.

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Edit Step 3  ¶ 

  • Use a flat blade screwdriver to gently pry out the black plastic cover behind the door pull.

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Edit Step 4  ¶ 

  • Remove the screw that holds the chrome plate behind the door pull.

  • Once again, the 2.5mm allen screw shown is not original. This will normally be a Phillips screw.

  • On the driver's side door, with no upper section of the arm on the door panel, the chrome panel behind the door pull can simply be removed and set aside at this point.

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Edit Step 5  ¶ 

  • On the other three doors, the chrome panel is a part of the upper arm on the door panel. Pull the chrome panel out from behind the door pull. You will need to pull the door pull away from the door to get the chrome panel around it. It will move down the arm on the door panel.

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Edit Step 6  ¶ 

  • Remove the large Phillips head screw at the very top of the arm on the panel.

  • This step does not apply to the driver's door.

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Edit Step 7  ¶ 

  • Under the arms on all four doors, there are two large Phillips screws. They are hidden out of sight up in holes like the one pictured. Making sure to properly seat the screwdriver in the head, as to not strip the screw, loosen these screws.

  • There is no need to remove the screws from the holes in the arm; in fact, doing so will make it more difficult to re-install them. Just loosen them enough to remove the arms from the panels.

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Edit Step 8  ¶ 

  • For doors with manual windows, you will need to remove the crank on any of the four doors before removing the panel.

  • Use a finger to push the tab that holds the trim piece to the crank out until it clears the crank.

  • Pull trim toward the knob on the crank to release the trim.

  • The trim piece will release from the peg at the base of the crank. The crank will now slide off.

  • When reassembling the manual window crank, make sure the tapered end of the washer is facing away from the door.

  • The tapered washer is sometimes missing. It is used to protect the panel from wear.

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Edit Step 9  ¶ 

  • Using a wide pry tool, like this trim removal tool, go around the edge of the panel between it and the metal part of the door. You will find it held in place by plastic clips. Gently pry each clip out all the way around.

  • On an older car like the W123, there will likely be some broken clips. Some times, panels are being held in place by only two or three clips.

  • Be aware that even though there should be no screws holding the panel to the door at this point, you will want to carefully check that someone didn't use a screw in the past to make up for broken clips. If you try and pull it off without removing the screw, you could damage your panel.

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Edit Step 10  ¶ 

  • On the rear doors, you will need to unplug the window switch from the plug and wire harness in the door before finally removing the panel.

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Edit Step 11  ¶ 

  • Remove the panel by pulling up on it. Do not pull straight out on the panel, or it may bend. This cannot be repaired. Pulling up on the panel before pulling out on it will also help ensure that you do not damage the plastic clips on the back of the map pocket on the door panel (only applies to front panels; rear panel shown in this picture).

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Edit Step 12  ¶ 

  • Pictured is the back of your door panel once removed. Notice the white plastic clips around the edge. Notice that many are missing. There should be several more on this door. Also, notice that some are broken.

  • Once the panel is removed, there should be a plastic vapor barrier between the panel and the door shell. This will need to be removed. If removed gently, it may be able to be reused. Otherwise, replace it with any thick plastic and 3M Spray Adhesive or contact cement. (Not pictured)

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Edit Step 13  ¶ 

  • This is a list of the major components within the door (front passenger side shown):

  • Window regulator (note, the rear window regulators are designed differently and are not immediately visible)

  • Door lock vacuum actuator, early style (does not apply to driver's door, which is equipped with the master vacuum switch instead, see attached picture). On later W123's, the actuators are in similar locations but look different.

  • Door pull

  • Door latch and lock mechanisms

  • Master vacuum switch (driver's door). Note that on later models the master switch will be oriented vertically instead of horizontally.

To reassemble your device, follow these instructions in reverse order.

For more information, check out the Mercedes W123 device page.

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