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Registered 2001 SLK230
Joined
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28 Posts
Discussion Starter #1
Hello friends,

slk 230 roof decided to not go down. Red roof switch is not lighting up in opening mode, no sounds from the roof at all, except when switch is in closing phase, than the light illuminates the switch and i can hear pump working. Hydraulics are fine, no leaks, fluid is at fill level, micro switch on the curtain on the trunk right side is working so is the roof relay located at the pump.

Has anybody experienced this issue.

Thank you.
 

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Premium Member 2001 SLK200K/2001 SLK320
Joined
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1,598 Posts
Hello friends,

slk 230 roof decided to not go down. Red roof switch is not lighting up in opening mode, no sounds from the roof at all, except when switch is in closing phase, than the light illuminates the switch and i can hear pump working. Hydraulics are fine, no leaks, fluid is at fill level, micro switch on the curtain on the trunk right side is working so is the roof relay located at the pump.

Has anybody experienced this issue.

Thank you.
Hi
Q. Is there any lights on on the dashboard - ABS, BAS, ESP?
 

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Registered 2001 SLK230
Joined
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28 Posts
Discussion Starter #6
Hello,

I replaced the Vario roof switch thinking that the vario switch was the cause of roof stuck closed it did not fix the problem, switch flashes upon ignition for a few seconds, light and pump is running when pressing button to close roof, but when I pull switch back roof will not open, no sound, no light nothing, if I ground pin 28 to ccm/mfcu roof opens, and I can close it normally with the Vario switch, all switches test ok with voltmeter i get a 00.0 ground read all but switches s69/11 and s69/12 they read 12.65v, trunk light works, I checked s69/12 tumbler and latch micro switch they are clicking...

Hopefully someone may have had the same problem and may give me some insights.

Thank guys.

::alido pavan
 

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Premium Member 2005 SLK55 AMG; 2005 SLK350
Joined
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4,684 Posts
I have no first hand experience, but I would next check the wire between the red switch and pin 28. This wire doesn't often fail - it does not flex. Did you test your old switch at all?
 

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Registered 2001 SLK230
Joined
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10 Posts
I bought an SLK230 last week. When I first went to see it the same thing happened. He called me back less than an hour later. The problem was, he said, that the cover in the boot (or trunk as you would probably call it) was not pulled back. Once it was pulled back the roof worked fine.
 

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Premium Member 2005 SLK55 AMG; 2005 SLK350
Joined
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4,684 Posts
BTW - here is some additional information to test your old switch. Technically, your switch is a "single pole, double throw momentary contact with center-off". Translated, the switch has a common pole, pin 4, which should be connected to either pin 5 or pin 7 if you push or pull on the switch (i.e. 0 ohms resistance). If you release the switch, pin 4 should not not connected to either (infinite or OL resistance).



In situ, pin 4 should be connected to ground, pin 5 and 7 should be connected to the MFCU pins 28 and 29, respectively.



Pins 1 and 2 are for the bulb inside the switch; I'm not sure what pin 3 does (it is connected to the interior wiring).
 

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Registered 2001 SLK230
Joined
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28 Posts
Discussion Starter #11
Amazing.

Great help,
I am going to check
old switch later on today.

Thank you again for your time and generosity.

::a
 

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Registered 2001 SLK230
Joined
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28 Posts
Discussion Starter #12
efair,
Sorry to enlist your help again, I did not test the old switch but
I tested the new one, and switch is fine, as I mention early if I ground
pin 28 roof opens, I can close the roof with the vario switch, or by ground pin 29,
I looked at the wires under the console and they look okay, is there a way to trace them
to them n10-3. Am I thinking correctly to assume that if the roof opens
by ground pin 28 that the problem is with the switch and or wiring
leading to the n10-3 and not with the various microswitches.

Thanks,
 

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Registered 2002 SLK320
Joined
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2,005 Posts
Hi,

So what happens if you ground the "switch end" of the pin 28 wire ?

If it doesn't work, bad wire / connector between the 2 parts

If it does work, bad switch

HTH, cheers Dave
 

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Registered 2001 SLK230
Joined
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28 Posts
Discussion Starter #15
Hi David,

Smart thinking, I am going to have a go
later this afternoon.

Thank you for your help.

::a
 

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Registered 2001 SLK230
Joined
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28 Posts
Discussion Starter #19
Hello,

and thank you for your response,
I finally got the time to check the switch and wire situation,
switch tests ok, wire is not ok, when i ground wire anywhere from switch to pin 28 roof will not open,
but when I ground pin 28 at the N10-3 roof opens perfectly (and closes when activating the red switch)

Wire from switch leading to pin 28 looks ok, I checked the wiring harness connecting to the switch and it looks fine too.....all wires on pigtail look fine....

Thank again for your feedback.

::alido pavan
 

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Premium Member 2005 SLK55 AMG; 2005 SLK350
Joined
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4,684 Posts
It sounds like you've tested it properly - how exactly did you "ground all along the wire"? With an insulation-piercing probe? I would suspect the connector at the MFCU since this is often disconnected for other reasons.
 
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