Vehicle Communication Interface Module (VCIM) C4 Connector End View

Courtesy of GENERAL MOTORS CORP.
Connector Part Information		OEM: 15398939 Service: 88953373 12-Way F (BK)
Pin	Wire Color	Circuit No.	Function
1	-	-	Not Used
2	TN/BK	2500	High Speed GMLAN Serial Data (+) (1)
3	TN	2501	High Speed GMLAN Serial Data (-) (1)
4-7	-	-	Not Used
8	TN/BK	2500	High Speed GMLAN Serial Data (+) (1)
9	TN	2501	High Speed GMLAN Serial Data (-) (1)
10-12	-	-	Not Used