Roof won't open/close correctly on Mercedes-Benz SLK32 AMG

Problem Description and Possible Solution

Position switches for the vario roof can fail, causing the roof to stop in the process of opening or closing.

Problem Data
RepairPal Verified
Average mileage: 51,500 (6,000–97,000)
3 model years affected: 2002, 2003, 2004
5 people reported this problem
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windows go down but top doesn't move. Can hear motor whirring.
roof will not open , flicking roof switch eventually opens windows but nothing else, relay on pump ok