rear sunroof tilt on the w203 c220?

[DMK/Happy]

Changed to new battery a couple of weeks ago at diagnostic center.No settings seem to be interrupted,however the front sunroof was a bit sluggish to respond at first,and the rear is not tilting ,neither is the rear blind rolling back.Do I have to return to diagnostic center? Thank you.

 

[Blobcat]

No, you need to clean and lubricate the sunroof mechanism. It gets dirty and this causes the sluggish behavior.
It also wears out the mechanism and can jam / break it. So clean and lubricate