July 1: So it begins. Don't worry, this is not in the correct legal jurisdiction!

Body Function Controller (BFC)

NOTE: When removing BFC, disconnect C3 connector FIRST. When installing BFC, connect connector C3 LAST. Program new BFC after installation. See REPROGRAMMING BFC in appropriate BODY CONTROL MODULE article.

Fig 1: Identifying PASSLOCK(R) Lock Cylinder Components

Courtesy of GENERAL MOTORS CORP.