W124 Passenger window switch opens sunroof!

scottan

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Apr 30, 2007
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64
Location
London
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C240 Sport Tip (gone) C124 E320 coupe
Must have a short somewhere because the passenger window switch closes the passenger window and opend the sunroof at the same time!!! Not good when its raining!. :eek:
Where to look...behind the dash?

Thanks
 

Dec

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Jul 28, 2004
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4,475
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C180,A.
Might be an earth problem somewhere. Taking a look inside the Convenience Control unit, it might yield some clues as to what’s wrong.

If you open up the unit you will find 8 relays, 4 to raise each window and 4 to lower each window, you could manually close the points on a relay with your finger, depending which relay you operate, the window will either close or open.

Not sure if this unit has any connection with the sunroof or if there is a relay somewhere else for the sunroof.

Operating the cabin window switches will click each relay and will identify which relay belongs to which window.



Dec


 

hotrodder

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Sep 28, 2008
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south east
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'93 320te
There's a relay on the back/underside of the sunroof motor, my random guess would also be to start with the convenience module under the back seat as comfort opening/closing via the key or fob opens/shuts the roof as well as the windows. Off the top of my head that's the only common link between windows and roof?
 
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scottan

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Joined
Apr 30, 2007
Messages
64
Location
London
Car
C240 Sport Tip (gone) C124 E320 coupe
Thanks guys...already have the seats/carpets out so will take a look tomorrow
 

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