Question about 1999 Mercedes-Benz SLK

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Top won't go down, sometines it won't go up

My 1999 slk's roof wont go down it gets as far as the trunk lid opening then it stops you can still hear the pump and motor but the roof don't go down, but then sometimes it works just fine. Switch light stays on does not blink

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This symptom almost always points to a mechanical issue, not an electrical one. The SLK hardtop is notorious for needing to be lubricated every couple of years. Here is a link with directions and photos:

http://www.benzworld.org/forums/r170-slk-class/1426014-lubing-vario-roof-pics-1-krytox.html

Sticking joints are the most common culprit to intermittent raising and lowering problems. Once those have been lubricated and that has been checked off the list, then look into electrical issues. Remember, you don't rebuild an engine that has only ran out of gas. The switch that is triggered by pulling back the partition separator is likely not the issue. If this switch is faulty, it will not even let the pump run to open the trunk. In order for that switch to be the problem, the switch would need to be shorting out AFTER the trunk lid opens. But that still also means the pump would be stopped and no longer be heard.

Mark Andrews

Posted on Aug 16, 2009

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I have seen this problem many times. One of your microswitches is either giving a false reading or fell of its retaining bracket. It is much easier to diagnose with a scan tool. My first guess would be that your retractable cover in the trunk lost it's switch input. Check the switch that is contacted when your cover is pulled out. If that is o.k. look inside the hard top deck lid cover very carefully and you will probably see either a broken wire or a loose switch. You may have to manually close your top becuse the switch inputs are illogical. Your manual will tell you how to close your roof.

Posted on Jun 26, 2009

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My 1999 slk's roof wont go down it gets as far as the boot lid opning then it stops you can still hear the pump and motor but the roof dont go down, but then sometimes it works just fine, (when its...


This symptom almost always points to a mechanical issue, not an electrical one. The SLK hardtop is notorious for needing to be lubricated every couple of years. Here is a link with directions and photos:

http://www.benzworld.org/forums/r170-slk-class/1426014-lubing-vario-roof-pics-1-krytox.html

Sticking joints are the most common culprit to intermittent raising and lowering problems. Once those have been lubricated and that has been checked off the list, then consider looking into electrical issues.

The moisture from the rain may be helping to lubricate these joints and that might be why it works fine in the rain...

Mark Andrews

Jun 22, 2009 | 1999 Mercedes-Benz SLK

1 Answer

Convertible top will not retrack


Hi Stan

First of all the roof is not even soppose to operate while the trunk is open - So there is the first problem Ive been involved with BMW's for a long time and this is the first Ive heard of a roof opening while the trunk is open. There is a built in feature that tells the car not to open the roof if the trunk is open and the other way roung while the roog lid is open the trunk cant open.

The reason the roof is not working anymore as soon as there is stress on the roof the electric motors(One operates the roof and the other operates the roof lid)  disengages, You said that the roof still worked but the lid did not so probably only the one motor disengaged. So what you have to do is open the trunk on the left hand side right behind the tail light pull away the material and simply just push the electric motor into place. that should fix your problem.

It may happen that the two motors have become out of sync, Disengage both electric motors manualy put the roof away engage the motors and that should put the roof and lid back into sync.

Beamerguy. 

Nov 08, 2008 | 1997 BMW 328

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Now the two motors in the trunk that works the convertable roof can be engaged and disengaged on motor works the roof lid and the other one the roof.

You need to get these motors in sync so that they open and close the roof in the correct order.

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