PeachParts Mercedes-Benz Forum - View Single Post - Exploring the Inside of the Late-124 Driver's Door

Jeremy5848 · #1 08-03-2013, 03:46 PM

While doing some work on the inside of the driver's door of my '95 E300 I took pictures to share with the group. The intent here is not to show you how to do anything but just to label the various pieces so that when you remove the door skin for the first time (there's always a first time!) you'll know a little about what you're seeing.

Earlier 124s do not have some of the bits and pieces shown in these pictures. Speakers, the white plastic rain cover on the pneumatic lock actuator, the black plastic cover over the door check, and the electrically adjustable outside mirror were all added at various times during the model run. If you can date these changes, chime in. If you can add pictures of something I've left out, please do so.

The front passenger door is a mirror image of the driver's door; the rear doors are similar but I've never seen the insides except on my '87 300D.

Jeremy

1. A sensor for the alarm system lives in the end of the door. It's easy to pry out, gently, with a knife blade. The yellowish plug can be disconnected; its wire goes to the outside lock cylinder and must be removed with it. I have more pictures of this procedure if anyone needs to see them.

2. Here's the lock cylinder with its alarm wire and the yellowish plug. FSM says the key is necessary to remove the lock but I've also heard that it's possible to remove without a key (example: in a wrecking yard). I don't know how, I've just heard it's possible.

3. This is the door handle and its mounting bracket removed from the door.

4. The door latch is mounted with three screws (very tight!). Late models use Torx but early models may use Philips.

5. The pneumatic-electric actuator for the Central Locking System mounts with two screws. It has an electrical cable and a plastic pneumatic (vacuum-pressure) hose plus a mechanical link to the latch and from the door button.

6. Here's the electrical plug for the pneumatic actuator. (It's hard to see.) Some other bits and pieces are identified in this picture.

7. This is the plastic shield that Mercedes added to protect the pneumatic actuator from water and maybe from people trying to break in. It's held by friction and one screw and I had a miserable time getting it back in.

8. The electric window regulator is attached with 5 nuts. Make sure they stay tight!

8. Here's what the regulator looks like with the window all the way down. Make sure the grease isn't dried out on the big gear and the sliders.

9. This is the terminal block for the electric window's motor. The motor is not electrically grounded. One polarity makes the window go down; reversing the polarity makes it go back up. All that is done with the window switches. If you measure the voltage across the two terminals you'll get either +12V or -12V depending on whether the window is going up or down and zero volts if it isn't moving.

10. This is the door check (holds the door open) as removed from the door. It's attached with three screws, one of which can be accessed only by first removing the door skin. Any time you have the door skin off, give thought to removing, checking, and re-greasing the door check. It will last forever if you take care of it. I don't remember my '87 300D having that black plastic cover so maybe it was added at a later date.

11. Here is a picture of the seat switch assembly and the inside door release. The seat switch buttons and the black plastic escutcheon under the door release must be removed before the door skin will come off. I put the pieces back on for the photo.

12. Finally, here's the wiring and electrical connector for the outside mirror. Unplug the connector and remove the three screws to remove the mirror assembly. Early models have a simpler plug (heater only) and a handle to adjust the mirror. Passenger mirrors are all electrically adjustable but I think have two plugs (memory fails me).

END