Mercedes-Benz Parts Catalog Mercedes-Benz Accessories Catalog Mercedes-Benz Technical Articles Mercedes-Benz Tech Forums
 
Follow Pelican Parts on Facebook Follow Pelican Parts on Twitter Follow Pelican Parts on Instagram Follow Pelican Parts on YouTube Follow Pelican Parts on Pinterest Follow Pelican Parts on Tumblr
  Search our site:    
View Recent Cars  |   Cart  | Project List | Order Status | Help    
Bookmark and Share

Pelican Technical Article:

Trunk Latch Removal

Tom Morr

Time:

30 minutes30 mins

Tab:

$103

Talent:

**

Tools:

T15, T27 Torx bits

Applicable Models:

Mercedes-Benz R170 (1998-04)

Parts Required:

Replacement trunk latch

Hot Tip:

Make sure the connecting rod is seated in the lock and the latch

Performance Gain:

Restores proper trunk locking and opening

Complementary Modification:

Replace the trunk lock

When the trunk won't open, the problem could be electrical, mechanical or pneumatic. If the key fob won't unlock the trunk, the fob might need fresh batteries, or possibly the receiver, wiring or microswitch are faulty. Also, the pneumatic central locking system might have a glitch.

If the key and lock button won't open the trunk, the problem is likely mechanical. The connecting rod might not be seated correctly in the lock or latch, or maybe the latch mechanism itself is worn out.

The latch is fairly easy to access and remove. If the trunk won't open, the Vario top might need to be partially activated to pop the trunk at the front. Then the release cables can be pulled to open the latch.

Trunk Latch Part Number: 170-750-01-84-MBZ

Torque Spec, mounting bolts: 8 Nm

A non-functioning trunk lock/latch often requires getting into the trunk to fix the problem.
Figure 1

A non-functioning trunk lock/latch often requires getting into the trunk to fix the problem. The first Vario roof cycle might need to be actuated to open the trunk from the front. A release cable (arrow) on each side will manually undo the trunk latch. The side panel has been removed here, but the cables are accessible behind removable hatches in the panels.

The latch is actually easier to reach with the trunk unfurled via the Vario top and release cables.
Figure 2

The latch is actually easier to reach with the trunk unfurled via the Vario top and release cables.

Three bolts having T27 Torx heads (red arrows) connect the latch to the body.
Figure 3

Three bolts having T27 Torx heads (red arrows) connect the latch to the body. Removing the recessed handle via a screw with a T15 head (blue arrow) creates an access window for removing the latch. The latch can also be removed from above -the plastic trim panel comes off by pulling its three plastic rivets (purple arrows).

Once the latch is unbolted from the trunk, the wiring plug (blue arrow) can be uncoupled.
Figure 4

Once the latch is unbolted from the trunk, the wiring plug (blue arrow) can be uncoupled. The connecting rod slips out of the socket (red arrow).

New replacement latch assemblies are available.
Figure 5

New replacement latch assemblies are available. If the mechanical mechanism works (actuated by the key in the lock cylinder), the latch's microswitch might be bad.

For reassembly, make sure that the connecting rod is seated in the latch's socket.
Figure 6

For reassembly, make sure that the connecting rod is seated in the latch's socket. Also, plug the wiring harness in to the latch.

With the latch bolted in, make sure that the other end of the connecting rod seats in the lock's socket.
Figure 7

With the latch bolted in, make sure that the other end of the connecting rod seats in the lock's socket.

Bookmark and Share
Comments and Suggestions:
scott Comments: Hi How can I reset the pull cables that release the front of trunk ?cables are slack and after closing trunk I can still pull up front of trunk both sides.and switch inside blinks and buzzer goes off every 10 minutes I checked code reder all was well.
September 17, 2016
  Followup from the Pelican Staff: You will have to replace them. If the handle is working normally, the cables are likely corroded. - Nick at Pelican Parts  
Linda Comments: Problem resolved. Locksmith used inflatable rubber slider to create vacuum between edge of trunk and car; then forced trunk open with hands. Problem was caused by cloth strap of ice chest caught in lock. Trunk opens, closes, locks & unlocks fine now. Only charged $60 while Mercedes wanted $180 just to diagnose problem before any work was done.
August 7, 2016
  Followup from the Pelican Staff: I have seen similar things in the past, usually luggage jammed on the trunk lid. Best bet when that happen is to use the mechanical key and push down on the lid to get it to release. - Nick at Pelican Parts  
Linda Comments: After calling several locksmiths, got an apt tomorrow with local guy. Will let you know results. 4.5 stars on YELP and has worked on Mercedes.

Thx for your help.
August 5, 2016
  Followup from the Pelican Staff: Thanks, keep us posted. - Nick at Pelican Parts  
Linda Comments: Is this something a locksmith can do?
August 5, 2016
  Followup from the Pelican Staff: Maybe. They will likely drill the lock out. - Nick at Pelican Parts  
Linda Comments: Nick,
Hi Nick,
The 1998 Mercedes SLK 230 does not have an external handle. There is a lid above the license plate but that is stationary. Since this is a 2-seat roadster, there is no access to the trunk from inside the car. I'm assuming the latch is inside the trunk which I can't open.
August 5, 2016
  Followup from the Pelican Staff: Ok. So you will have to either break the lock and latch to get it open, or take it a shop to see if they can get it open. - Nick at Pelican Parts  
Linda Comments: 1998 Mercedes Benz SLK 230
Problem: Trunk won't open manually with key or dash board key button. What might cause this? Can this be repaired by a locksmith?

This car is a hard-top convertible; top is up and panel in trunk is not pulled forward because have many items in trunk.
August 5, 2016
  Followup from the Pelican Staff: The latch or the handle for the trunk could be faulty. Start by checking if the handle is stuck in the pulled position. - Nick at Pelican Parts  
bodyman28422 Comments: Just replaced all hydraulic cylinders and rear hatch cables . Refilled hydraulic reservoir and top will not work . Swirch on console blinks fast .I assume rear tilt latches are not locking. What is the problem ? Do the cables need to be adjusted uo or down ?
July 20, 2015
  Followup from the Pelican Staff: Was the top working before the parts were replaced? if so, something may not be adjusted properly. - Nick at Pelican Parts  
cornbeef Comments: hi ive got the roof to go down perfectly in sequence but it wont come back up on the switch no noise nothing
January 19, 2015
  Followup from the Pelican Staff: maybe a microswitch is malfunctioning. I would check the vehicle for fault codes to start. - Nick at Pelican Parts  
cornbeef Comments: hi my 1998 slk 230 r170 if the key fob locks the doors and the petrol cap should,nt it lock my boot aswell or is something wrong
January 19, 2015
  Followup from the Pelican Staff: The trunk should lock as well. The issue may be in the latch or switch for the trunk. - Nick at Pelican Parts  
cornbeef Comments: cant open the boot and the roof wont activate what do i do now im baffled
December 17, 2014
  Followup from the Pelican Staff: Try the mechanical key hole in the trunk.

There will likely be fault codes for the roof issue. I would start by checking the vehicle for fault codes. If the system is not working properly, a fault code will be set. This will be your best bet when diagnosing. - Nick at Pelican Parts
 

  Search our site:    

View Cart & CheckOut | Project List | Order Status |  Help    

 

[Home] [Customer Service] [Shopping Cart] [Project/Wish List]
  [Privacy Statement]  [Contact Us] [About Us] [Shipping] [Careers]

Copyright © Pelican Parts Inc. -    DMCA Registered Agent Contact Page

Page last updated: Wed 12/7/2016 02:27:40 AM