560SL (107048) V8-56L (117967) Air Bag Control Module - Technical Service Bulletin - Page 297
When disconnection the 10-pole plug connection (X29/9), pins 3, 5, 6, 7, 8 are short-circuited on the lower half of the plug.
When disconnecting the connection for the ETR squibs (R12/1, R12/2) and the airbag squib (R12/3), they are short-circuited.