SL-Class (R230) 2003 -- 2012: Discussion on the SL500, SL550, SL600

SL/R230: Doors won't lock, trunk won't open, roof won't open!!

Old 09-23-2008, 12:17 PM
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Doors won't lock, trunk won't open, roof won't open!!

Sorry I double posted this in the AMG thread.

I had to use the key to manually open the trunk.

The roof just doesn't open.

Doors won't lock.

I've replaced the battery in the trunk already with a brand new one, to no avail.

No error messages otherwise displayed...

What the hell is wrong?
Old 09-23-2008, 12:46 PM
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It sounds like some sort of computer issue that needs resetting. You may need a trip to the dealer.
Old 09-23-2008, 02:36 PM
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Originally Posted by ClayMan
Sorry I double posted this in the AMG thread.

I had to use the key to manually open the trunk.

The roof just doesn't open.

Doors won't lock.

I've replaced the battery in the trunk already with a brand new one, to no avail.

No error messages otherwise displayed...

What the hell is wrong?
Check to see if your seat bolsters still inflate. If not, it is probably a problem with the air pump that controls these functions. It resides in the trunk.
Old 09-28-2008, 11:36 PM
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I'm sure if you ran this by your local MB srevice guy he could probably tell you exactly what it is. Good Luck!
Old 10-23-2008, 11:45 AM
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Points to the battery in the trunk but if you've replaced the battery then maybe some sensor mis-reading the battery if that's possible? Good luck.
Old 10-24-2008, 09:27 AM
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Sounds like you're behind on your car payments, and the bank has shut down your car. Just kidding!
Get the car into the dealer and have them check it out, then get out your check book to get the car out of the dealer. You really don't have many options here.
Old 09-13-2009, 11:54 AM
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I had the same problem it was a fuse in the fuse box right behind the passenger seat... PS, I have a Star Diag, if your in the NYC area
Old 09-13-2009, 01:20 PM
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Originally Posted by JackStraw
Check to see if your seat bolsters still inflate. If not, it is probably a problem with the air pump that controls these functions. It resides in the trunk.
The airpump does not control all these features
Old 09-13-2009, 01:21 PM
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Originally Posted by Scotsman
Points to the battery in the trunk but if you've replaced the battery then maybe some sensor mis-reading the battery if that's possible? Good luck.
If it was battery in trunk, the convience features would be disabled with a message in the instrument cluster.
Old 09-13-2009, 01:23 PM
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THe most likely cause of this is the RCM (roof control module) that needs to be reinitialized, reflashed, and or replaced. reflashing this module usually fixes this issue. I have seen several cars with it. You will need access to a star diag system with the latest software on it. Also, make sure the person doing the reflashing is familiar with the procedure and has a good battery charger plugged in. I usually use a midtronics battery maintainer when reflashing modules.
Old 09-13-2009, 04:53 PM
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It sounds like the same problem I had a couple of months ago. There are fuses behind the passenger seat accessed through the storage compartment . Then there is the pump that controls all the locks, top ,glove box and center console. I had to replace the pump. I hope your car is under some type of warranty . Good luck and keep us posted, no pun LOL
Old 09-13-2009, 05:13 PM
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Just to clarify

The hydraulic pump controls the roof
the pse pump controls all pneumatic aspects
Old 09-13-2009, 07:03 PM
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His wifes head hard into the headboard nightly!!
I have same issue daily....my consumer battery dies overnight. Its going to dealer tomm. ave you tried driving car for abit..does it charge it at all..come back online? drive for min 15minutes..then mine wrks again..i have all new batts also..hopefullt tomm hey will finally find/fix the issue! only thing i HATE about the car.
Old 09-24-2012, 12:34 AM
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Doors won't lock, trunk won't open, close trunk separator??

What did your problem turn out to be? amp yellow fuse behind passenger seat not blow. I have exact same problem that just started..

Last edited by SL55 BLACKBIRD; 09-24-2012 at 01:07 AM.
Old 02-27-2013, 02:40 AM
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Same issue here but in our case trunk wont open at all with or without key. Also passenger door wont unlock or lock with remote.
Old 03-20-2014, 08:34 PM
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Having same issue

[QUOTE=M3AMG43;3714265]I had the same problem it was a fuse in the fuse box right behind the passenger seat... PS, I have a Star Diag, if your in the NYC area[/QUOTE.
Hi are you still in the NYC AREA?
Old 07-17-2014, 08:38 PM
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nmash33 i had the same issue today. what is the star diag? i am in downtown brooklyn. my doors won't lock and trunk won't open on 2005 sl500
Old 07-17-2014, 10:27 PM
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Go to junior's auto repair on Tilden Ave and tell them "fashion" sent you. They have a star diagnostic tool. They do all my Benz work.
Old 03-19-2015, 11:00 AM
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2003 SL500 MERCEDES
DOORS WON'T OPEN AND TOP WON'T RETRACT

i HAVE READ THROUGH THE FORUM AND UNDERSTAND THE PROCESS OF ELIMINATION STARTING WITH THE FUSES BUT I AM HAVING TROUBLE EVEN OPENING MY FUSE BOX BEHIND THE PASSENGER SEAT .ANY SUGGESTIONS
Old 03-19-2015, 04:58 PM
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Lift up the bottom panel of the storage box, the fuses are underneath.
The front panel can be carefully removed by prying forward, 2 clips on top, 2 plastic tabs on bottom.

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