The convertible control module may have been replaced with a European component, running afoul of US safety regulations.
General Motors has issued a recall for a small batch of just four Buick Cascada convertibles.
Service technicians may have installed an incorrect convertible control module designed only for the European market. A few specific behaviors run afoul of US safety regulations.
"The European replacement module can close the vehicle windows automatically when the convertible roof is closed and can allow windows to be closed remotely from distances beyond 11 meters using the key fob, which is not the intended operation in the US," recall documents note.
The problem was first identified when US dealers reported problems attempting to program replacement control modules. An investigation determined that the parts were not supposed to be distributed in the US.
Service technicians will simply swap the Euro-spec control module for the proper FMVSS-compliant version.