SL/R230: load assist sl55
Load assist will not work until the trunk lid is fully raised, so make sure that it is. If so, then you may have a bad limit switch S124.
Here is a diagnostic aid for the vario roof that might be helpful with other issues:
http://benzbits.com/r230/roof/VarioR...gnosticAid.pdf
Here's where S124 is located:


