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
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:
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.
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Re: top won't go down, sometines it won't go up
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.
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the most common problem with those retractable hard tops are leaking hydraulic cylinders. check the insides of your trunk where the top down cylinders are located if there's a leak,and also check the level of the hydraulic fluid situated near the right brake lights.
in your slk manual, there are instructions on how to manually close the roof when the hydraulics fail.
your can check is it something stuck in the lock, first operate your roof either way, if you are going to open the roof as a first action boot lid will open to backward, let boot lid fully open and stop operating the roof, ignition off and have a look if something stuck you can see, if you are going to close the roof let close the roof and before close the boot lid stop operating roof switch, otherwise faulty boot lid lock, if faulty lock but you can try by mettle key blade which is in your electronic key, first take out mettle key from electronic key then insert mettle key in to the key hole in boot lid turn fully left and open boot if not work turn fully left and push it in, is this information helped you?
If the top is half way down that means that the trunk is open and should be touching the trunk switch to continue the process. The switch must be bad and it is inside the rear right fender close the the stop light
First check that you have oil on the hydraulic pump that it is inside the trunk on the rear right fender the oil should be between the marks. If thats ok check when you put the ignition on if the switch that operates the roof is on, should be off, on means that something is wrong, if blinks 6 times one of the 5 or 7 switchs are not closed, check one by one. check the two that close the trunk at the middle, the cover, the trunk limit switch, the trunk switch
Sounds like maybe some pin switches for interlocks have gone bad. Open your trunk and look for the rubber booted switches and try holding them or shorting them, if you make the top move it shows you which ones are bad.
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
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...
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.
The problem is that your roof(SOFT TOP) lid isnt closing properly. If you open the roof lid you see there is a button on one of the latches that tells the car that the roof is securely closed if your roof lid is not secure the trunk wont open. To test this press down on the roof lid and the try to open the trunk.