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Old 03-27-2007, 03:14 AM
Pancho's Avatar
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Join Date: Mar 2007
Location: Godless Massachusetts
Posts: 25
Remote trunk lock not working on W208 (430CLK Cabriolet)

Remote trunk lock not working on W208 (430CLK Cabriolet)

Can open trunk by inserting key in trunk lock,
but button on fob, and button on dash do not open trunk.

Some tech told me it is a vacuum switch.
Have a friend that had dealer fix his on a C class, $800.

Any repair help/tips would be appreciated.

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Old 03-27-2007, 01:38 PM
Join Date: May 2005
Posts: 40
Check the fuses....does the remote work on the in maybe the remote needs a new battery....or check...
1999 CLK 430
113. Engine
105,000 Miles
Raptor 245/40/17
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Old 03-27-2007, 01:52 PM
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Join Date: Apr 2000
Location: Falls Church, VA
Posts: 5,316
Try looking at the fuse diagram, and locating the fuse for the central locking system. Then remove the fuse for ten seconds, put it back in, and see if that fixes the problem.
Chuck Taylor
Falls Church VA
'66 200, '66 230SL, '96 SL500. Sold: '81 380SL, '86 300E, '72 250C, '95 C220, 3 '84 280SL's '90 420SEL, '72 280SE, '73 280C, '78 280SE, '70 280SL, '77 450SL, '85 380SL, '87 560SL, '85 380SL, '72 350SL, '96 S500 Coupe
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Old 03-27-2007, 11:09 PM
Pancho's Avatar
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Join Date: Mar 2007
Location: Godless Massachusetts
Posts: 25
Key remote operates door locks and alarm OK.

5 fuses in locking system.
Removed all, tested them for continuity--OK.
Re-installed all.

When I press trunk button on key remote, buzzing sound comes from trunk lock. Removed lock, pneumatic actuator extends when press either key remote, or console button Doesn't seem to be air problem.

Hit it with WD40, no help. Trunk still will not open with remote or console button.

If pneumatic, then what is purpose of two electric leads ?

See link:
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Old 03-28-2007, 04:43 PM
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Join Date: Dec 2004
Location: Findlay, Ohio
Posts: 26
Follow thru as to what that plastic arm should to when the plunger moves it. If I remember it turns something to make it open. Also see if the plunger is coming out far enough to move the plastic arm the correct amount. Had mine apart several times and it works OK now but I still have to pull it back out to set the change the lock tumblers so they match the door key. My lock came from a wreck and of course it wasn't set for the same key my door is. Jerry

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