Safety Warning

DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.

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HOMESERVICE MANUALSCHEVROLET2001CHEVY EXPRESS G2500, VAN CARGO EXTENDED, 5.7 R, L31/KL8REPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 808 (BODY CONTROL SYSTEM)COMPONENT LOCATORBODY CONTROL SYSTEM CONNECTOR END VIEWS

2001 Chevrolet Chevy Express G2500, Van Cargo Extended, 5.7 R, L31/KL8

Body Control System Connector End Views

2001 Chevrolet Chevy Express G2500, Van Cargo Extended, 5.7 R, L31/KL8SECTION Body Control System Connector End Views

WARNING: This page is about a different car, the 2003 Saturn Vue. However, it is still accessible from the selected car via links, so may be relevant.

Body Control Module (BCM) Terminal Identification C1

Courtesy of GENERAL MOTORS CORP.
Connector Part Information		12084945 16-Way F Micro-Pack 100 Series (GY)
Pin	Wire Color	Circuit Number	Function
A1	-	-	Not Used
A2	L-GN	1391	Driver Door Unlock Relay Control
A3	L-BU	195	Door Lock Relay Control
A4	WH	194	Door Unlock Relay Control
A5-A6	-	-	Not Used
A7	OG/BK	781	Driver Door Lock Switch Unlock Signal
A8	RD/BK	780	Driver Door Lock Switch Lock Signal
B1	-	-	Not Used
B2	D-BU	1201	Headlamp Low Beam Signal
B3	-	-	Not Used
B4	GY	731	EVAP Temperature Sensor Signal
B5-B7	-	-	Not Used
B8	L-GN	66	A/C Request Signal

Body Control Module (BCM) C2

Courtesy of GENERAL MOTORS CORP.
Connector Part Information		12110088 24-Way F Micro-Pack 100 Series (GY)
Pin	Wire Color	Circuit Number	Function
A1	-	-	Not Used
A2	L-BU	1134	Park Brake Switch Signal
A3	PK	1200	Headlamp High Beam Signal
A4	WH	1579	Oil Life Reset Switch Signal
A5	PU	333	Brake Fluid Level Switch Signal
A6	BN	96	Windshield Wiper Switch Pulse Delay Signal
A7	-	-	Not Used
A8	PK	94	Windshield Washer Switch Signal
A9	RD	228	Windshield Washer Pump Control
A10	PK	339	Ignition 1 Voltage
A11	L-GN	80	Key In Ignition Switch Signal
A12	BK/WH	746	Passenger Doors Ajar Switch Signal
B1	YE	749	Security Indicator Control
B2	GY/BK	745	Left Front Door Ajar Switch Signal
B3	L-BU	292	Rear Defog Switch Signal
B4	RD/BK	744	Liftgate Ajar Switch Signal
B5	D-GN	392	Rear Window Washer Switch Signal
B6	-	-	Not Used
B7	OG	192	Fog Lamp Switch Signal (w/ Fog Lamps)
B8	-	-	Not Used
B9	YE	743	Accessory Voltage
B10	BN	9	Park Lamp Supply Voltage
B11	L-GN	1478	Coolant Level Switch Signal
B12	PU	719	Low Reference

Body Control Module (BCM) C3

Courtesy of GENERAL MOTORS CORP.
Connector Part Information		12110244 24-Way F Micro-Pack 100 Series (PK)
Pin	Wire Color	Circuit Number	Function
A1	WH	156	Dome Lamp Control
A2	RD/WH	812	12 Volt Reference
A3	-	-	Not Used
A4	YE	317	Fog Lamp Relay Control (w/ Fog Lamps)
A5	OG/BK	1445	BCM Program Enable Signal
A6	RD	2445	Rear Wiper Relay Control
A7	-	-	Not Used
A8	L-GN/BK	592	DRL Relay Control
A9	BN/WH	230	I/P Lamps Dimming Control
A10	PU	1807	Class 2 Serial Data
A11	-	-	Not Used
A12	TN	2501	CAN Low
B1	TN/WH	816	A/T Shift Lock Switch Signal
B2	BK	28	Horn Relay Control
B3	OG/BK	1057	Low Reference
B4	GY	112	Windshield Wiper Switch Signal 1
B5	TN	470	Low Reference
B6	WH	193	Rear Defog Relay Control
B7	YE	1836	Security System Sensor Signal
B8	D-GN	113	Windshield Wiper Switch Signal 2
B9	PU	1807	Class 2 Serial Data
B10	PU	1807	Class 2 Serial Data
B11	-	-	Not Used
B12	TN/WH	2500	CAN High

Body Control Module (BCM) C4

Courtesy of GENERAL MOTORS CORP.
Connector Part Information		12110626 8-Way F Metri-Pack 280 Series (GY)
Pin	Wire Color	Circuit Number	Function
A	OG	1732	Courtesy Lamps Supply Voltage
B-C	-	-	Not Used
D	OG	2540	Battery Positive Voltage
E	GY	8	I/P Lamps Dimmer Switch Signal
F	BK/WH	151	Ground
G	-	-	Not Used
H	OG	1640	Battery Positive Voltage

RENDER: 1.0x

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.
• Brakes feel soft, pull hard to one side, or make grinding noises.
• The engine overheats, stalls repeatedly, or misfires under load.
• You are missing required tools, torque specs, or safe lifting equipment.
• You are not confident in the next step or safety outcome.