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Car Forum / Mercedes-Benz Cars / September 2005

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1992 300D sunroof switch problems...

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Pete Stephenson - 10 Sep 2005 00:41 GMT
Greetings all,

My newly-purchased 1992 300D has an interesting issue with the power
sunroof.

Specifically, the sunroof has the forward-backward movement and the
up-down movement, and the switch is made in such a way to mimic the
movement of the roof.

However, the "down" option doesn't work...and rather makes the roof go
"up". Pushing it "forward" will bring the roof forward, and then up.
Basically anything other than "back" will move it "up".

If I release the switch while moving it "forward", I can stop the roof
before it goes "up".

Any ideas on what's causing it? Seems like a bad switch, which should be
pretty easy to replace.

On a different note, I occasionally hear intermittent ticking noises
that appear to be coming from the rear axle area. They appear to
correspond to each tire revolution. Occasionally they stop, but come
back either in a few minutes or the next time I get into the car to
drive it. Not sure what's causing it, as I can't really localize the
sound. It doesn't seem to be tied to any particular driving habit (i.e.
it happens when I'm going fast, slow, etc.), road condition, or other
external condition. Very odd.

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Pete Stephenson
HeyPete.com

Wan-ning Tan - 10 Sep 2005 05:16 GMT
IIRC, the switch only mimics the movement but makes no different signal
between forward and up (or backward and down).  There is a stop
mechanism in the roof when it is fully closed (before going up).  That
mechanism is broken.

The switch has only 6 pins.  Two for illumination.  One is 12v.  The
rest three are only enough to change between 2 directions, not enough for 4.

> Greetings all,
>
[quoted text clipped - 23 lines]
> it happens when I'm going fast, slow, etc.), road condition, or other
> external condition. Very odd.
Pete Stephenson - 10 Sep 2005 06:46 GMT
> IIRC, the switch only mimics the movement but makes no different signal
> between forward and up (or backward and down).  There is a stop
> mechanism in the roof when it is fully closed (before going up).  That
> mechanism is broken.

Interesting. Where would one find this mechanism, and how would one go
about determining where it's broken? How would one repair it?

> The switch has only 6 pins.  Two for illumination.  One is 12v.  The
> rest three are only enough to change between 2 directions, not enough for 4.

Interesting. One learns something new every day.

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Pete Stephenson
HeyPete.com

 
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