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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.

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Comments and Suggestions:
Tesla6518 Comments: If your trunk/boot is locked with the luggage cover not in place and you cannot open the trunk via the key or central locking then try this.
Open the hood/bonnet and locate the control panel on left for UK cars and right for most others. look for the connector nearest the battery it has a locking clip on the left side back. to find the cable you need you will probably have to cut the retaining cable tie. You are looking for a grey cable with a continuous violet tracer it is a very thin cabledo not mistake for grey/purple. you need to short this cable to earth by whichever means suits you. I soldered a wire to a sewing pin and put it straight through. then turn on ignition and open the top as usual. stop once trunk/boot has opened. and then follw instruction on pelican
September 24, 2017
Kevin Comments: Roof won't open issue. Leaking water from the left passenger side of the boot. This has caused my central locking pump to fail. When I press the red button to open the roof, all four windows open and the hydraulic pump is making the right noise, boot tries to lift up, right hand side lift up about 10 cm but the left only lifts up about 2 cm before stopping.

Please can you confirm what the problem might be? My first thoughts are the hydraulic ram cylinder in the left? Would a water leak affect or burn the hydraulic pump?

Pleas help as Pelican Parts have been able to help me in all aspects relating to Slk 👊🏻.

Btw SLk230 R170 1999 UK
July 25, 2017
  Followup from the Pelican Staff: I can't confirm, but I can guess. I would assume the top seal is leaking and the drain is plugged. - Nick at Pelican Parts  
TY Comments: WHAT IF TRUNK CABLES WONT RELEASE ??? PLEASE HELP
July 25, 2017
  Followup from the Pelican Staff: You will have to break or cut them to open and repair what is preventing them from releasing. - Nick at Pelican Parts  
Andrew Comments: Hi Nick. I have a 98 slk 230. I don't know how to check fault codes for the roof
June 28, 2017
  Followup from the Pelican Staff: You will need an advanced Mercedes-benz scan tool. Something that scans the entire vehicle. - Nick at Pelican Parts  
Andrew Comments: When I try to open the roof the windows go down and the trunk tries to open on the passenger side. The driver's side does not move. I can hear the motor running. Hydrolic fluid is between the lines.
June 25, 2017
  Followup from the Pelican Staff: What vehicle, are there any fault codes stored? - Nick at Pelican Parts  
Sonu Comments: My roof and trunk both operate but the trunk after opening does not close back and the light in the switch is continuosly on
April 25, 2017
  Followup from the Pelican Staff: The latch may be faulty. With the trunk open, try to manually close it using a screwdriver, does it latch? If so, try adjusting it.- Nick at Pelican Parts  
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
 

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Page last updated: Mon 9/25/2017 02:29:52 AM