Hello dear SL-R230 owner! I come from the S-Class Forum and drive an S500 (W220). Both vehicle types are in common that the middle circuit 1. is not alive forever and 2. is no longer available at MB. My vehicle is currently incapacitated and has a problem with the Shift Lock. Maybe there is also in this forum someone who is deep in the matter and can contribute to the DAS diagnosis something in this S-Class post If someone has recently received the middle circuit at MB I would be grateful for information. Has it ever been possible to activate a used center circuit without having to change the ignition lock and engine control unit for another vehicle? @db-fuchs will you please stop by?