*HELP* trunk not opening
Thread Starter
Junior Member
Joined: Sep 2009
Posts: 29
Likes: 0
From: Silicon Valley, CA
2003 CL, 2008 SL 500, 2007 BMW, 2005 Prius
*HELP* trunk not opening
Hello fellow MB friends,
My 2003 CL trunk does not open or do anything with remote and from inside the car, and when I put the key in and try to open manually, it pops just less than half an inch and doesn't do anything all locked up. Any way to get in trunk besides trying to break any lens ? Any help will be appreciated. Thanks
My 2003 CL trunk does not open or do anything with remote and from inside the car, and when I put the key in and try to open manually, it pops just less than half an inch and doesn't do anything all locked up. Any way to get in trunk besides trying to break any lens ? Any help will be appreciated. Thanks
MBWorld Fanatic!
Joined: Feb 2008
Posts: 1,803
Likes: 12
From: Charleston, SC
GL450
You're saying it unlatches and opens a crack but doesn't auto-open all the way? If so, just push it the rest of the way open. It sounds like the hydraulic pump ran dry and it can't activate the piston to open the trunk. It will feel tough to open, but it will open manually.
Thread Starter
Junior Member
Joined: Sep 2009
Posts: 29
Likes: 0
From: Silicon Valley, CA
2003 CL, 2008 SL 500, 2007 BMW, 2005 Prius
You're saying it unlatches and opens a crack but doesn't auto-open all the way? If so, just push it the rest of the way open. It sounds like the hydraulic pump ran dry and it can't activate the piston to open the trunk. It will feel tough to open, but it will open manually.
MBWorld Fanatic!
Joined: Nov 2001
Posts: 6,340
Likes: 22
From: Southern California, USA
2003 CL55 AMG
Can be a few things.
* Vacuum pump (if you have the auto open/close option).
* Bad rear SAM
* Wiring issues in the loom between the electric latch and rear SAM.
* Vacuum pump (if you have the auto open/close option).
* Bad rear SAM
* Wiring issues in the loom between the electric latch and rear SAM.
Thread Starter
Junior Member
Joined: Sep 2009
Posts: 29
Likes: 0
From: Silicon Valley, CA
2003 CL, 2008 SL 500, 2007 BMW, 2005 Prius
MBWorld Fanatic!
Joined: Nov 2001
Posts: 6,340
Likes: 22
From: Southern California, USA
2003 CL55 AMG
MBWorld Fanatic!
Joined: Feb 2008
Posts: 1,803
Likes: 12
From: Charleston, SC
GL450
Unfortunately, the SAM is in the trunk. So is the vacuum pump.
There is a mechanical override to the vacuum activated latch, if I recall correctly. The key should unlatch it so you can open it, even if nothing else works correctly. What exactly happens when you try to use the key?
There is a mechanical override to the vacuum activated latch, if I recall correctly. The key should unlatch it so you can open it, even if nothing else works correctly. What exactly happens when you try to use the key?
Trending Topics
Junior Member
Joined: May 2009
Posts: 26
Likes: 0
From: Los Angeles
CL500
Are these trunk vacuum pumps known for going bad? Mine is leaking it sounds like (loud hissing when trying to activate or opening manually), shocks also worn out (won't stay propped open). Seems like parts that should be rock solid when rarely used. Any feedback?
MB World Stories
The Best of Mercedes & AMG
Manual Mercedes? 6 Times Sindelfingen Let Drivers Have All The Fun
Verdad Gallardo
Mercedes SLR McLaren 722 S Is Extremely Rare Example Modified by McLaren
Verdad Gallardo
8 Classic Boxy Mercedes Designs That Have Aged Like Fine Wine
Verdad Gallardo
Flawlessly Restored Mercedes 190E Evo II Heads to Auction
Verdad Gallardo
Electric Mercedes C-Class Unveiled: 11 Things You Need to Know
Verdad Gallardo
Mercedes EQS Gets A Major Update: Everything You Need to Know
Verdad Gallardo
5 Underrated Mercedes-Benz Models That Don't Get the Love They Deserve
Verdad Gallardo
Mercedes 300D Has Pushed Well Past 1 Million Miles and It Ain't Stopping
Verdad Gallardo
10 Most Reliable Mercedes-Benz Models You Can Buy Used
Verdad Gallardo
MBWorld Fanatic!
Joined: Nov 2001
Posts: 6,340
Likes: 22
From: Southern California, USA
2003 CL55 AMG
Read this thread: https://mbworld.org/forums/cl-class-...lfunction.html
Even though it starts out as the soft close vacuum issue on the doors, I also end up discussing the truck latch vacuum pump and fix as well.
MBWorld Fanatic!
Joined: Feb 2008
Posts: 1,803
Likes: 12
From: Charleston, SC
GL450
The latch is pneumatic, and is leaking if you can hear it. The opening mechanism that whirs is hydraulic. If it doesn't go all the way up, there is a leak which you need to patch and then refill the oil, or replace the whole unit.
To get the lid open, use the emergency key underneath, turn the key (try both directions) and once turned, push up on the button. That will mechanically open the lock, bypassing the pneumatics.
To get the lid open, use the emergency key underneath, turn the key (try both directions) and once turned, push up on the button. That will mechanically open the lock, bypassing the pneumatics.
