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Pelican Technical Article:

Door Latch Replacement

Nick Czerula

Time:

3 hours3 hrs

Tab:

$200

Talent:

***

Tools:

Plastic prying tool, Door panel clip tool, flathead screwdriver, T20, T30 Torx driver

Applicable Models:

Mercedes-Benz E320 (2003-09)
Mercedes-Benz E500 (2003-06)
Mercedes-Benz E55 AMG (2003-06)

Parts Required:

Door panel, vapor barrier, vapor barrier seal, door panel clips

Hot Tip:

Do not tear door vapor barrier

Performance Gain:

Proper door latch and power lock function

Complementary Modification:

Clean and lubricate door latches on other doors

Central locking in Mercedes-Benz W211 models controls door locks, trunk lid or luggage compartment lock and fuel filler flap lock. The electronic functions of central locking are spread out over several door control modules, with sensors and actuators connected directly to a control module in the vicinity of their installed location. The rear electronic (SAM) module is the master control module for central locking.

The lock mechanism in each door consists of a latch, an exterior door handle and an inside door lock release handle. Only the driver door (left front in North America) is equipped with a lock cylinder. The exterior door latch is responsible for locking, unlocking and latching the door shut. The latch itself is pretty reliable. However, having the electronic lock solenoid integrated in the latch creates some problems. The lock solenoids fail over time, leaving you with a malfunctioning lock. If it is the driver lock, you can still lock and unlock with the key. With other kinds of doors, you may not be so lucky. If you are having a problem with the lock, try cleaning and lubricating the latch. I find this will restore function of the lock from time to time. If I can successfully restore function this way, I still replace the latch to avoid future problems. It is a good test to see if the problem is electrical or mechanical.

Keep in mind that when your car was serviced before, parts may have been replaced with different size fasteners used in the replacement. The sizes of the nuts and bolts we give may be different from what you have, so be prepared with different size sockets and wrenches.

Protect your eyes, hands and body from fluids, dust and debris while working on your vehicle. If you're working with the electrical system, disconnect the battery before beginning. Always catch fluids in appropriate containers and properly dispose of any fluid waste. Recycle parts, packaging and fluids when possible. Never work on your vehicle if you feel the task is beyond your ability.

Our vehicle may vary slightly from yours as models do change and evolve, as they grow older. If something seems different, let us know and share your info to help other users. Do you have questions or want to add to the article? Leave a comment below. When leaving a comment, please leave your vehicle information.

Remove the interior door panel. See our tech article on front door panel removing.

Slowly peel the vapor barrier (green arrow) off the door.
Figure 1

Slowly peel the vapor barrier (green arrow) off the door. Be careful not to tear the barrier while removing it. If the vapor barrier tears, replace it. The red arrows points to the butyl seal you are separating from the door.

Working at the outer edge of the door, in line with the outer door handle, pull the seal away from the door (red arrow).
Figure 2

Working at the outer edge of the door, in line with the outer door handle, pull the seal away from the door (red arrow). This will expose the door lock cylinder fastener (red arrow). Loosen the T20 Torx door lock cylinder fastener.

As you loosen the T20 Torx (blue arrow shows Torx as viewed from outside the door), the lock cylinder will move away from the door (red arrow).
Figure 3

As you loosen the T20 Torx (blue arrow shows Torx as viewed from outside the door), the lock cylinder will move away from the door (red arrow).

Pull the door handle out (blue arrow).
Figure 4

Pull the door handle out (blue arrow). Then pull the lock cylinder out of the door. Disconnect the electrical connector by lifting the retaining pin (red arrow) while pulling the connector straight out.

Move to the door module.
Figure 5

Move to the door module. Disconnect the door latch electrical connector (red arrow) by pressing the release tab and pulling it straight out. Then feed the wiring harness through the door vapor barrier (blue arrow).

Next you have to detach the wiring harness (red arrows) from the door.
Figure 6

Next you have to detach the wiring harness (red arrows) from the door. Push the bottom of the retainer up (inset) and pull it out of the door. Then remove the entire clip with the harness from the door.

Pull the inner window seal (red arrow) up off the door completely.
Figure 7

Pull the inner window seal (red arrow) up off the door completely.

Working inside the door at the latch (red arrow), remove the guard from the door latch (blue arrow).
Figure 8

Working inside the door at the latch (red arrow), remove the guard from the door latch (blue arrow). With the window seal removed, it will easily detach from the latch and pull it out of the door.

Once detached, remove the guard (red arrow) from the door.
Figure 9

Once detached, remove the guard (red arrow) from the door.

Now you have to move the outer window regulator rail to the side and out of the way.
Figure 10

Now you have to move the outer window regulator rail to the side and out of the way. Start by removing the door glass. Then remove the rivets and slide the regulator rail over toward the center of the door (red arrow). See our tech article on window regulator replacing.

Remove the three T30 Torx door latch fasteners (red arrows).
Figure 11

Remove the three T30 Torx door latch fasteners (red arrows).

Then remove the door latch (red arrow) from the door by rotating the bottom toward the door skin and feeding the cable and harness out of the door (blue arrow).
Figure 12

Then remove the door latch (red arrow) from the door by rotating the bottom toward the door skin and feeding the cable and harness out of the door (blue arrow).

To install the new latch reverse the order of the steps.
Figure 13

To install the new latch reverse the order of the steps. Remember to check the function of the latch before installing the door panel. I suggest closing the latch with a flathead screwdriver while the door is open. Then open it using the cables once you attached them. This will ensure it is working.



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Page last updated: Fri 12/2/2016 02:44:03 AM