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Door Lock and Latch Replacement
 
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Pelican Technical Article:

Door Lock and Latch Replacement

Tom Morr

Time:

2 hours2 hrs

Tab:

$150 to $170

Talent:

**

Tools:

Torx bits, wrenches, trim panel remover or equivalent, Phillips screwdriver

Applicable Models:

Mercedes-Benz R170 (1998-04)

Parts Required:

Replacement lock, latch

Hot Tip:

Lubricate moving parts and pivot points with Mercedes-Benz lubricating paste or spray lube

Performance Gain:

The door will latch and lock

Complementary Modification:

Replace the exterior handle if necessary

The door locks on pre-facelift R170 SLKs (1996-January 2000) are vacuum actuated. The vacuum-actuated central locking system can be complicated to troubleshoot, but replacing the mechanical part of the system is comparatively straightforward.

The lock assembly removes through the door, so the door panel must be removed along with the exterior handle. Please refer to our articles on door panel and exterior handle removal for further assistance

Some SLK models have the lock/latch riveted to the door panel. Luckily, the early R170 models use two bolts that take T30 Torx bits. Torque spec on these is 8 Nm ±2.

Leaving the window all the way up will maximize clearance inside the door panel. Reverse the removal steps to install the replacement lock/latch.

The door panel must be removed so that the lock/latch can be passed out through the inside.
Figure 1

The door panel must be removed so that the lock/latch can be passed out through the inside.

Please refer to the exterior door handle article for removal details.
Figure 2

Please refer to the exterior door handle article for removal details.

Peel the weather shield membrane forward to uncover the lower access opening (yellow arrow).
Figure 3

Peel the weather shield membrane forward to uncover the lower access opening (yellow arrow).

Pull the rubber drain plug out of the lower rear corner (yellow arrow).
Figure 4

Pull the rubber drain plug out of the lower rear corner (yellow arrow).

The window guide rail (yellow arrow) is held in by two bolts (purple arrows) that take T30 Torx bits.
Figure 5

The window guide rail (yellow arrow) is held in by two bolts (purple arrows) that take T30 Torx bits. The lower bolt is accessed through the plug hole.

Remove the guide rail (yellow arrow).
Figure 6

Remove the guide rail (yellow arrow).

The hinge strap is held to the inner door by a Phillips screw, underneath the exterior handle's forward gasket.
Figure 7

The hinge strap is held to the inner door by a Phillips screw, underneath the exterior handle's forward gasket. For installation, use thread locking compound on this screw (yellow arrow).

Remove the hinge strap through the door opening (yellow arrow).
Figure 8

Remove the hinge strap through the door opening (yellow arrow).

Unhook the interior door handle control cable from the lock/latch (yellow arrow).
Figure 9

Unhook the interior door handle control cable from the lock/latch (yellow arrow).

Carefully pull the vacuum fitting off the port on the lock/latch (purple arrow).
Figure 10

Carefully pull the vacuum fitting off the port on the lock/latch (purple arrow).

Use a T30 Torx to remove the two bolts (purple arrows) that secure the lock/latch to the door.
Figure 11

Use a T30 Torx to remove the two bolts (purple arrows) that secure the lock/latch to the door.

Shimmy the lock rod down through its slot in the door panel; then remove the assembly through the opening at the bottom of the door.
Figure 12

Shimmy the lock rod down through its slot in the door panel; then remove the assembly through the opening at the bottom of the door. Reverse the steps to install the lock/latch. Make sure that the locating tab (purple arrow) is inboard of the door rib.

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Comments and Suggestions:
Hilario Comments: Is the vacuum fitting only available anywhere? Mine has snapped off in the line, and seems that it would be easiest to just replace that piece?
November 3, 2015
  Followup from the Pelican Staff: Not that I know of. Give our parts specialists a call at 1-888-280-7799. They can figure out what part or repair kit you need.
- Nick at Pelican Parts
 
gaz121065 Comments: Thanks.I have been testing it and I agree.With door panel removed it sounds like there is some type of air leak on the mechanism.how does the vacuum line clip off the mechanism.
August 17, 2015
  Followup from the Pelican Staff: If I remember correctly, you press a collar to unlock it and pull the line straight off. If you share a photo I can be more precise. - Nick at Pelican Parts  
gaz121065 Comments: Hi there.I have a 2002 slk230 and the drivers door doesn't lock when using remote.It will lock with key.when using remote to unlock all works fine.As this is a vacuum setup for the central locking system and it will unlock but not lock I'm assuming the vacuum line to door is ok and the actual door mechanism is faulty.Would this be a fair assumption.Cheers.
August 10, 2015
  Followup from the Pelican Staff: Could be a vacuum leak at the actuator. If the other locks work, I would assume the issue with that latch. - Nick at Pelican Parts  
Mb- Comments: Hi, when I start driving my doors/trunk are closing, when I open the driver door all the doors/trunk get unlocked. If I press the lock button on the panel all the doors\trunk are locked/unlocked but when I use the key to close\open the door the signal light are on but the doors\trunk won't work.
March 23, 2015
  Followup from the Pelican Staff: You didn't mention what vehicle you are working on. Might be an issue with the switch in lock cylinder. You will have to repeat your symptoms / tests while monitoring the commands / responses to the body module or module that controls locking. A input or signal seems to be missing. - Nick at Pelican Parts  
marky18 Comments: I need a latch what the door closes on
where would i find them Thank you.
August 16, 2014
  Followup from the Pelican Staff: 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
 

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