Idle Air Control (IAC) Valve Connector End View

Courtesy of GENERAL MOTORS CORP.
Connector Part Information		12162190 4-Way F Metri-Pack 150.2 Series Pull to Seat (BLK)
Pin	Wire Color	Circuit No.	Function
A	LT GRN/BLK	444	IAC Coil B Low
B	LT GRN/WHT	1749	IAC Coil B High
C	LT BLU/BLK	1748	IAC Coil A Low
D	LT BLU/WHT	1747	IAC Coil A High