Vehicle Interface Unit (VIU) Control Module - C1 Connector End View

Courtesy of GENERAL MOTORS CORP.
Connector Part Information		12110113 32-Way F Micro-Pack 100 Series (RED)
Pin	Wire Color	Circuit No.	Function
A1	-	-	Not Used
A2	ORN	1044	Radio Class 2 Serial Data
A3	DK GRN	835	Entertainment and Comfort Serial Data
A4-A5	-	-	Not Used
A6	BLK/WHT	372	Remote Radio Audio Output (-)
A7	DK GRN/ WHT	368	Remote Playback Device Right Audio Signal
A8	BRN/WHT	367	Remote Playback Device Left Audio Signal
A9	BARE	814	Drain Wire
A10	LT BLU	1235	Audio Low Reference
A11	BRN/WHT	2506	Audio Return Signal
A12	DK GRN/ WHT	2507	Audio Transmit Signal
A13	BARE	1792	Drain Wire
A14	GRY/BLK	2508	Microphone Signal
A15	BARE	1782	Drain Wire
A16	ORN	2540	Battery Positive Voltage
B1-B8	-	-	Not Used
B9	GRY	655	Cellular Microphone Signal
B10	BARE	1705	Drain Wire
B11	TAN/BLK	2510	OnStar Serial Data Return
B12	DK BLU/ WHT	2511	OnStar Serial Data (-)
B13	LT BLU/ BLK	2512	OnStar Serial Data (+)
B14	GRY	2520	Transceiver Low Reference
B15	PPL/WHT	2513	Ignition ON Signal
B16	-	-	Not Used