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Old 01-05-2004, 01:34 PM
bhatt's Avatar
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Join Date: Apr 2000
Location: Oakville, Ontario, Canada
Posts: 421
Question 560SL central locking

Recently bought a 560SL and found that the central locking works just like it does in my 300SDL -- when you pull the door release lever from inside the car, all of the doors unlock.

Wondering why they did this in an SL. If I leave the top down and lock the car, all someone needs to do is reach inside, pull the lever, then open my trunk. How do I park with a laptop in the trunk? I would have thought that opening the doors with the inside handle in an SL should *NOT* open the trunk also, considering it's a convertible.

What do you guys with SL's do? Do I have to keep locking & unlocking the trunk separately? (turn the key sideways before pulling it out) This could be a royal pain and kind of defeats the purpose of central locking.

My burglar alarm is disconnected as I expect with most MB's of this vintage. Even if it were connected, I'm not sure I'd trust a honking horn/flashing lights to protect my trunk cargo!

Any help someone could provide would be much helpful!!


'83 300SD 335,000km (207k) mi SOLD
'87 560SL 163,000km (101k mi) SOLD
'86 300SDL 356,000km (220k mi) SOLD
'92 500SEL 250,000km (155k mi) SOLD
'90 300SL 140,000km (87k mi) SOLD
'01 S430 260,000km (161k mi) SOLD
'03 SL500 167,000km (104k mi)
'07 GL320 CDI 4MATIC 289,000km (162k mi)
'07 S550 4MATIC 170,000km (105k mi)
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Old 01-05-2004, 07:04 PM
DanielG's Avatar
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Join Date: Oct 2002
Location: Deerfield, Illinois
Posts: 349
I think that is all you can do as confiugured. When you lock the trunk you lock the doors as well, so when you leave the car lock the trunk (take the key out sideways) instead fo the door and you have locked the entire car (no extra step). Also, when you leave the car with a valet you should have the trunk locked and leave only the valet key (when you have something very valuable in the trunk).

I would guess that you could modify the car to disconnect the trunk lock from the vacuum system so that it is not unlocked by the opening of the doors.

Otherwise, you can retrofit an electronic locking system and disconnect the trunk from the doors -- this has been discussed in this forum (see tech forum) and the generaly consensus seemed to be that owners do not want aftermarket gadgets that inherently cause damage to the car (by necessitating the splicing of wiring etc) and/or take originality out.

1986 560SL (52.5k miles) sold 11/24/04

1987 560sl (55.6k miles)
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Old 01-05-2004, 09:50 PM
Registered User
Join Date: Sep 1999
Location: San Antonio, Texas, USA
Posts: 154
It's easy!
To keep trunk locked independent of the central locking system:
Turn the master key (key with the red dot) completely to the right and pull it out in that position. Valet key will not unlock it now.
The trunk can now only be opened with the master key by turning it back to the left to vertical to remove key. All the way to the left unlocks locked doors.
So a glance at the key slot shows:
Vertical -- locked if doors locked.
Horizontal-- locked all the time.

They that can give up essential liberty to obtain a little temporary safety deserve neither liberty nor safety. Benjamin Franklin, A.D. 1759

1975 240D
1986 560SL
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