Chevrolet Express (2003 – 2007) – fuse box diagram

Year of production: 2003, 2004, 2005, 2006, 2007

Passenger Compartment Relay Box

No.	A	Protected Component
1	–	–
2	10	Outside Rearview Mirror Switch
3	15	Courtesy Lamp Relay
4	10	Left Rear Stop/Turn Signal
5	10	Cargo Unlock Relay
6	10	Right Rear Stop/Turn Signal
7	10	Driver Unlock Relay
8	10	Center High Mounted Stop Lamp (CHMSL), Cruise Control Module (CCM), Throttle Actuator Control Module (TCM (’06-’07)), Transmission Control Module (Diesel), Engine Control Module (Diesel)
9	10	HVAC Control Assembly, Air Temperature Actuator, HVAC Control Processor (’06-’07), Auxiliary Blower Motor Relays (’06-’07), Air/Mode Actuator (’06-’07)
10	20	HVAC Control Assembly, Vacuum Pump (Diesel)
11	10	Electronic Brake Control Module (EBCM), High Idle Switch (’06-’07), Traction Control Switch (’06-’07)
12	30	Rear Window Defogger Relay
13	30	Auxiliary Blower Motor Relays (Low/MED/High Speed)
14	10	Driver Turn Mirror
15	20	Door Lock Relay
16	10	Upfitter Park
17	–	–
18	10	Left Tail Lamp, License Lamp
19	10	Passengers Turn Mirror
20	10	Right Ttail Lamp
21	15	Trailer Park Lamp
22	10	Inflatable Restraint l/P Module Disable Switch, Front Park/Turn Signal Lamps, Front Marker Lamps
23	50	Upfitter Wiring Harness
	20	Cooling Fan (SEO) (’03-’05)
	60	Electronic Brake Control Module (EBCM) (’06-’07)
24	50	Auxiliary Relay (YF7)
	20	Auxiliary Relay (SEO)
Circuit Breaker
CB1	25	Power Window (Driver/Front Passenger)
Relay
R1	Rear Window Defogger
R2	Front Passenger Lock Actuator, LR/RR Door Lock Actuators
R3	Driver/Front Passenger/Cargo Lock Actuators, LR/RR Door Lock Actuators
R4	Auxiliary Relay
R5	Courtesy Lamp
R6	Cargo Unlock
R7	Driver Unlock
R8	Park Lamp
R9	Window Residual Accessory Power

Engine Compartment Fuse Box

No.	A	Protected Component
1	15	Radio, Vehicle Communication Interface Module (VCIM (’03-’05)), Chime Module (’06-’07)
2	20	Gasoline: Powertrain Control Module (PCM)
	20	Diesel: Engine Control Module (ECM), Transmission Control Module (TCM), Coolant Heater
3	10	Trailer Stop/Turn Relay (Left)
4	10	Trailer Stop/Turn Relay (Right)
5	10	Back-Up Lamps Trailer or C405 (Cutaway)
6	10	Gasoline: Powertrain Control Module (PCM), Automatic Transmission, Body Control Module (BCM)
	10	Diesel: Engine Control Module (ECM), Glow Plug Control Module (GPCM), Automatic Transmission, Body Control Module (BCM)
7	15	Stop Lamp Switch
8	20	Rear Window Defogger, Heated Mirror
9	10	Right Daytime Running Lamp/Turn Signal
10	10	Left Daytime Running Lamp/Turn Signal
11	15	Body Control Module (BCM)
12	20	Fuel Pump Relay
13	30	Trailer Wiring Harness
14	15	Turn Signal Hazard Flasher Module
15	15	Horn Relay
16	15	Body Control Module (BCM)
17	15	Trailer Stop/Turn Relay (Left and Right)
18	15	Body Control Module (BCM)
19	10	Body Control Module (BCM)
20	10	Remote Control Door Lock Receiver (RCDLR)
21	10	4.8L/5.3L/6.0L (Gasoline): Even Fuel Injectors, Even Ignition Coils
	10	4.3L (Gasoline): Even Fuel Injectors, Ignition Coil
22	10	Stop Lamp Switch and A/C Relay
23	15	4.8L/5.3L/6.0L (Gasoline): Odd Fuel Injectors, Odd Ignition Coils, EVAP Canister Purge Solenoid, Mass Air Flow (MAF) Sensor, Park/Neutral Position (PNP) Switch
	15	4.3L (Gasoline): Odd Fuel Injectors, Ignition Control Module, EVAP Canister Purge Solenoid, Mass Air Flow (MAF) Sensor, Park/Neutral Position (PNP) Switch
	10	Diesel: MAF/IAT Sensor, Park/Neutral Position (PNP) Switch
24	10	Body Control Module (BCM)
25	20	Diesel: Fuel Heater
26	10	Inside Rearview Mirror
27	10	Crankcase, Powertrain Control Module (Gasoline), Engine Control Module (Diesel)
28	10	Brake Transmission Shift Interlock System
29	20	Auxiliary Power Outlet
30	15	Cigar Lighter, Data Link Connector (DLC)
31	10	Instrument Panel Cluster (IPC)
32	10	A/C Relay
33	30	Diesel: Engine Control Module (ECM)
34	10	EVAP Canister Vent Solenoid (Gasoline), Rear Fog Lamp Relay
35	10	Diesel: Cooling Fan Relay
36	15	Back-Up Lamps, Park/Neutral Position (PNP) Switch
37	10	Supplemental Inflatable Restraint System
38	15	Gasoline: Powertrain Control Module (PCM), Cruise Control Module (CCM), Throttle Actuator Control (TAC) Module, Steering WheelSpeed/Position Sensor
	10	Diesel: Engine Control Module (ECM), Glow Plug Control Module (GPCM), Transmission Control Module
39	15	Gasoline: Oxygen Sensor
40	15	Gasoline: Oxygen Sensor
41	15	Windshield Wipers Relay
42	10	Right Headlamp (Low Beam)
43	10	Left Headlamp (Low Beam)
44	10	Left Headlamp (High Beam)
45	10	Right Headlamp (High Beam )
46	10	Body Control Module (BCM)
47	25	Windshield Wiper Motor
48	60	Electronic Brake Control Module (EBCM)
49	40	Starter Relay, Ignition Switch
50	30	Trailer Wiring Harness
51	40	Blower Motor Resistor
52	40	Ignition Switch
53	10	Diesel: Engine Control Module (ECM)
54	–	–
55	125	Fuse Block – Body
Circuit Breaker
CB1	30	Power Seat
Relay
R1	Windshield Wiper
R2	Air Conditioning
R3	Rear Fog Lamp
R4	Headlamp (High Beam)
R5	Fuel Pump
R6	Headlamp (Low Beam)
R7	Horn
R8	Starter
R9	Diesel: Engine Control Module (ECM)

Auxiliary Fuse Box

No.	A	Circuit Breaker
2	10	Dome Fluorescent Work Lamps
3	15	Access Panel Relays
4	–	–
Relay
1	Access Panel Latches (Left Side Rear)
5	Access Panel Latches (Left Side Front)
6	Access Panel Latches (Right Side)

WARNING: Terminal and harness assignments for individual connectors will vary depending on vehicle equipment level, model, and market.