Join Date: May 2010
Vehicle: 2005 SLK 55; 2005 SLK 350
Other Toys: Several past R170's
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I've never heard anybody rave about that... Where?
If the roof is unlatching, my guess (extreme emphasis on guess) is the relay or a solenoid is not functioning, and pressure is not being switched to the two roof cylinders. There's no sensor to detect such a failure, and that's probably why there's no code.
Try replacing the relay first since it's cheap.