Back View of the PCM Connector C1 Connector End View

Courtesy of GENERAL MOTORS CORP.
Connector Part Information		2.5L VIN 4 Powertrain 35 Pin Gray Connector C1 with Blue Terminal Secondary Lock Insert
Pin	Wire Color	Function
C1-1	WHT/GRN	Fuel Pump Relay Control
C1-2	-	Not Used
C1-3	PNK/BLU	Cruise Control Module Signal
C1-4	BRN	Tachometer
C1-5	YEL/BLU	A/C Condenser Fan Relay Control
C1-6	GRY	TP Signal (for cruise control, if equipped)
C1-7	WHT/BLK	O/D Indicator Lamp Control
C1-8	BLU	Main Relay Control
C1-9	ORN/BLU	Shift Mode Switch Input
C1-10	GRY/BLU	Power/Normal Indicator Lamp Control
C1-11	-	Not Used
C1-12	BLU/WHT	Fuel Tank Level Sensor Input
C1-13	PNK/WHT	HVAC Blower Motor Idle-Up Signal
C1-14	YEL/RED	O/D Switch Signal
C1-15	BLK/ORN	Electrical Load Idle-Up Signal (rear defogger switch)
C1-16 to C1-17	-	Not Used
C1-18	PNK/BLK	EBCM Idle-Up Signal (ABS equipped vehicles only)
C1-19	GRY/GRN	Fuel Vapor Temperature Sensor Input
C1-20	BRN/RED	Fuel Tank Pressure Sensor Input
C1-21 to C1-24	-	Not Used
C1-25	PPL/GRN	Serial Data Output
C1-26	BLU/ORN	PSP Switch Idle-Up Signal
C1-27	GRY/WHT	A/C Cut-Out Control
C1-28	YEL/BLK	A/C Idle-Up Signal
C1-29	RED/YEL	Tail Lamp Switch Idle-Up Signal
C1-30	-	Not Used
C1-31	GRN/WHT	Brake Switch Signal
C1-32	GRY/YEL	Fuel Tank Pressure Sensor Ground
C1-33	GRY/RED	Fuel Tank Pressure Sensor Reference Voltage
C1-34	PPL/YEL	MIL Control
C1-35	WHT	Battery Positive Voltage