Where does this plug go (1991 300e)?
 

Just finished replacing the seatbelt relay, and in reattaching everything I have a loose black wire at the end of which is a silver pin surrounded by a long, plastic plug enclosure about 1/4 inch square. On one of the relays there is a hole for a pin but it has a round enclosure, so it doesn't go there. Anyone know where it should go or what it would be for, maybe a phone? Thanks.