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Removing Your Front Door Lock
 
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Pelican Technical Article:

Removing Your Front Door Lock

Steve Vernon

Time:

3 hours3 hrs

Tab:

$0

Tools:

T30 Torx, drill and bit, rivet tool or replacement nuts and bolts

Applicable Models:

Mercedes-Benz W203 (2001-07)

Hot Tip:

Get new gaskets

Performance Gain:

Doors that work

Complementary Modification:

Replace switches

Replacing the front door locks on your Mercedes C320 involves the removal of the door panels, exterior door handle and left window rail before you can remove the lock. Please see our article on removing your front door panel and the front door handle. You must complete the work on the door panel and handle to get you to the point where this job starts.

With the membrane off the door you can see the door lock, pull, release cable and wiring.

Begin by unplugging the lock wiring connection from the panel on the door.

Follow the wires back to the lock clipping the zip ties as you go. Do not pull the zip tie holders from the door frame as you can use them to reattach the harness during reassembly by inserting new zip ties.

Use a T30 Torx and remove the three Torx screws holding the lock to the door frame.

You will need to get the side of the window regulator closes to the lock out of the way to get the lock out of the door. Move the window all the way to the top. Drill out the three rivets holding the rail to the door frame and lift the rail out of its support hole. This will give you enough room to lower the door lock into the bottom of the door and out through the access hole.

Installation is the reverse of removal. Make sure you hook the L shaped part of the door handle behind the bracket on the lock when reassembling.

With the membrane off the door you can see the door lock (green arrow), pull (yellow arrow), release cable (blue arrow) and wiring (red arrow).
Figure 1

With the membrane off the door you can see the door lock (green arrow), pull (yellow arrow), release cable (blue arrow) and wiring (red arrow).

Begin by unplugging the lock wiring connection (red arrow) from the panel on the door.
Figure 2

Begin by unplugging the lock wiring connection (red arrow) from the panel on the door.

Follow the wires back to the lock clipping the zip ties as you go (red arrow).
Figure 3

Follow the wires back to the lock clipping the zip ties as you go (red arrow).

Do not pull the zip tie holders from the door frame as you can use them to reattach the harness during reassembly by inserting new zip ties (red arrow).
Figure 4

Do not pull the zip tie holders from the door frame as you can use them to reattach the harness during reassembly by inserting new zip ties (red arrow).

Use a T30 Torx and remove the three Torx screws (red arrows) holding the lock to the door frame.
Figure 5

Use a T30 Torx and remove the three Torx screws (red arrows) holding the lock to the door frame.

You will need to get the side of the window regulator closes to the lock out of the way to get the lock out of the door.
Figure 6

You will need to get the side of the window regulator closes to the lock out of the way to get the lock out of the door. Move the window all the way to the top. Drill out the three rivets (red arrows) holding the rail to the door frame and lift the rail out of its support hole (yellow arrow). Note: the bottom two rivets had already been drilled out and replaced by nuts and bolts by a previous owner.

This will give you enough room to lower the door lock into the bottom of the door and out through the access hole.
Figure 7

This will give you enough room to lower the door lock into the bottom of the door and out through the access hole.

Make sure you hook the L shaped part of the door handle behind the bracket on the lock (red arrow) when reassembling.
Figure 8

Make sure you hook the L shaped part of the door handle behind the bracket on the lock (red arrow) when reassembling.

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Comments and Suggestions:
John E Comments: Nick,
Here is the post that I errantly put inthe W210 section:
W203 Door Lock Actuator Replacement.
I think that I got it in correctly. drivers door
Now, when I connect the new door lock actuator, the door locks do nothing.
The car isn't responding to the FOB RF at all.
It works in the EIS ignition and starts the car.
I've looked at all the fuses that I can find and none look burned out.
I have 2 FOBs and I tried them both.
Using the Central Locking Control on the dash, I am able to lock and unlock all of the doors except for the drivers.
The trunk release doesn’t work with the FOB.
I notice the red LED on the FOB is working when I use it.
I would like to put the door back together but I want to see the actuator function first.
November 5, 2016
  Followup from the Pelican Staff: Sorry, I can't keep track of the original question when answering, so your vehicle info was only in that one. WAY too many questions and answers.

The receiver is in your door handle. Possible the wire or connection is at fault. - Nick at Pelican Parts
 
John E Comments: Nick,
I unfortunately posted in the wrong model W210 before.
I bought the front driver door lock actuator.
When I installed it, it wouldn't work.
November 5, 2016
  Followup from the Pelican Staff: Thanks for the follow up and note. - Nick at Pelican Parts  
Tdubb Comments: I can't find a good explanation for my 2002 C230. I can't figure out how to remove the door actuator. This explanation is close, but looks like side air bag is in the way.
August 1, 2016
  Followup from the Pelican Staff:
We don't currently have that tech article. If we get a chance to perform the procedure, we will be sure to document it.

I would grab a repair manual. It will have the procedure, special tools and torque specs.

Give our parts specialists a call at 1-888-280-7799. - Nick at Pelican Parts
 
Hélder Carneiro Comments: Hello,
Did spring replacement on the left front lock, but only solved the problem of the door opening , the door lock kept the same effect " machine gun " .
Why is this be happening?
Excuse my English , but I am using the translator .
Thank you.
December 3, 2015
  Followup from the Pelican Staff: The latch may be faulty. I would check it for a broken part. - Nick at Pelican Parts  
Chris Comments: Replaced the lock without problems, however once reassembled the car will unlock it but it will not lock with the central locking no movement whatsoever!. Using the physical key or lock pin suggests no obstructions. Any suggestions?
November 1, 2015
  Followup from the Pelican Staff: Check if the wiring is not connected at the latch or lock cylinder. - Nick at Pelican Parts  
Kyler Comments: Hello. I have Mercedes C203K W203 2004 with "bouncing" door lock on passenger front door I have removed front door panel and the front door handle for your instruction and received this resulthttp://www.pelicanparts.com/techarticles/Mercedes-W203/BODY-Removing_Your_Front_Door_Panels/images_med/pic15.jpg. Should I remove speaker, air bag unit with rivets drilling operation and metall plate left of the air bag unit, with rivets drilling operation? Should I remove whole acoustic foil or only left side until rail?
July 23, 2015
  Followup from the Pelican Staff: is this the advice you are looking for?

You will need to get the side of the window regulator closes to the lock out of the way to get the lock out of the door. Move the window all the way to the top. Drill out the three rivets holding the rail to the door frame and lift the rail out of its support hole. This will give you enough room to lower the door lock into the bottom of the door and out through the access hole. - Nick at Pelican Parts
 
Leo lee Comments: I am certain the spring is installed correctly. I can only assume the door lock actuator is defective. I bought another online. When I remove the lock assembly at the same time I inspected the door handle backing plate and it is broken so I have no spring tension from the backing plate only a little tension from the lock assembly. I am having a problem accessing the front torq screw I can't slide the door handle to access the screw. How is this done to access the second forward screw?
August 22, 2014
  Followup from the Pelican Staff: try this article: http://www.pelicanparts.com/techarticles/Mercedes-W203/BODY-Removing_Your_Front_Door_Handles/BODY-Removing_Your_Front_Door_Handles.htm - Nick at Pelican Parts  
Leo lee Comments: When I installed the door handle in my 2003 E-320 left front. I was careful to slide the "L" bracket toward the door so the "L" would engage and it does and will open the door but it lacks the spring tension of the other doors. I didn't notice this before. Did I install the handle incorrectly or is possible that either the lock assembly or door handle back plate spring is worn?
August 20, 2014
  Followup from the Pelican Staff: If the problem wasn't there when you started, something is likely installed wrong. Remove it again, then reverse the steps in this tech article. - Nick at Pelican Parts  
Leo lee Comments: I removed the front left door lock in my 2003 E-320 Mercedes to replace the broken spring in the actuator. I made certain I chose the correct left spring. I installed the lock assembly back in the car. It did not correct the problem. The spring clicks the door rod up & down now but when I try to open or close with the remote or the switch on the dash it still bounces up & down. Any suggestions?
August 20, 2014
  Followup from the Pelican Staff: I would guess the actuator is faulty and the spring you installed is incorrect.

Give our parts specialists a call at 1-888-280-7799 and they can help figure out which part or repair kit you need.
- Nick at Pelican Parts
 
Eric Comments: Question: once you have drilled out the three rivets, what do you when reassembling?
October 23, 2013
  Followup from the Pelican Staff: You can use nuts and bolts or install new rivets. If there is enough room to use nuts and bolts, I would as it is much easier to deal with. Just double check that the bolt head won't interfere with the travel of the regulator.- Nick at Pelican Parts  

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