Transmission Control Module C1 Connector End View

Courtesy of GENERAL MOTORS CORP.
Connector Part Information		1928403820 Conn 38F (BK)
Pin	Wire Color	Circuit No.	Function
1-15	-	-	Not Used
16	BN/WH	2960	Keyword Serial Data
17-21	-	-	Not Used
22	PK	639	Ignition 1 Voltage
23	BK/WH	451	Ground
24	-	-	Not Used
25	TN/WH	2500	High Speed GMLAN Serial Data Bus+
26	TN	2501	High Speed GMLAN Serial Data Bus-
27-30	-	-	Not Used
31	PK	639	Ignition 1 Voltage
32	BK/WH	451	Ground
33	OR	1440	Battery Positive Voltage
34	-	-	Not Used
35	TN/WH	2500	High Speed GMLAN Serial Data Bus+
36	TN	2501	High Speed GMLAN Serial Data Bus-
37-38	-	-	Not Used