Fuse Box Diagrams GMC Envoy (2002-2009)

Page Contents:

In this article, you will find information about the fuses of the GMC Envoy (models 2002, 2003, 2004, 2005, 2006, 2007, 2008, and 2009), including diagrams of the fuse boxes, a list of fuses and relays, their designation, and the location of the fuse blocks within the vehicle.

GMC Envoy (2002-2009)

Checking and Replacing Fuses in GMC Envoy

The wiring circuits in the vehicle are protected from short circuits by a combination of fuses and circuit breakers. This greatly reduces the chance of damage caused by electrical problems.

Look at the silver-colored band inside the fuse. If the band is broken or melted, replace the fuse. Be sure you replace a bad fuse with a new one of the identical size and rating.

Caution!

Spilling liquid on any electrical components on your vehicle may damage it.
Always keep the covers on any electrical component.
Be sure you replace a bad fuse with a new one of the identical size and rating.

Location of Fuse Boxes

Engine Compartment Fuse Block:
The fuse block is located under the hood in the engine compartment on the driver’s side of the vehicle. GMC Envoy (2002-2009): Engine compartment fuse box location

Remove the primary cover by pressing the two locking tabs.
Remove the secondary cover by snapping off while lifting.
To reinstall the fuse panel cover, reverse the sequence.

Rear Underseat Fuse Block:
The rear underseat fuse block is located under the rear seat on the driver’s side of the vehicle.

Fuse Box Diagrams

2002

Engine Compartment Fuse Block

List of fuses in the Engine Compartment Fuse Block (2002)

№	Usage
Mini Fuses
1	EGAS
2	Passenger’s Side High-Beam Headlamp
3	Passenger’s Side Low-Beam Headlamp
4	Back-Up Trailer Lamps
5	Driver’s Side High-Beam Headlamp
6	Driver’s Side Low-Beam Headlamp
7	WASH
8	ATC
9	Windshield Wipers
10	Powertrain Control Module B
11	Fog Lamps
12	ST/LP
13	Cigarette Lighter
14	COILS
15	RIDE
16	TBD - Ignition 1
17	Crank
18	Air Bag
19	ELEK Brake
20	Cooling Fan
21	Horn
22	Ignition E
23	ETC
24	Instrument Panel Cluster, Driver Information Center
25	Automatic Shift Lock Control System
26	ENG 1
27	Back-Up
28	Powertrain Control Module 1
29	Oxygen Sensor
30	Air Conditioning
31	TBC
50	Passenger’s Side Trailer TRN
51	Driver’s Side Trailer TRN
52	Hazard Flashers
J-Case fuses
32	Trailer
33	Anti-Lock Brakes (ABS)
34	Ignition A
35	Blower Motor
36	Ignition B
Micro Relays
37	Headlamp Washer
38	Rear Window Washer
39	Fog Lamps
40	Horn
41	Fuel Pump
42	Windshield Wipers/Washcr
43	High-Beam Headlamp
44	Air Conditioning
Solid State Relays
45	Cooling Fan
46	HDM
Mini Relay
47	Starter
Miscellaneous
48	Instrument Panel Battery
49	Fuse Puller

Rear Underseat Fuse Block

№	Usage
01	Right Door Control Module
02	Left Door Control Module
03	LGM 2
04	TBC 3
05	Rear Fog Lamps
06	LGM/DSM
07	TBC 2
08	Power Seats
09	Blank
10	DDM
11	AMP
12	PDM
13	Rear Climate Controls
14	Left Rear Parking Lamps
15	Auxiliary Power 2
16	VEH CHMSL
17	Right Rear Parking Lamps
18	LOCK
19	Blank
20	Sunroof
21	LOCKS
23	Blank
24	UNLOCK
25	Blank
26	Blank
27	OH Battery / OnStar System
29	Rainsense Wipers
30	Parking Lamps
31	TBC 4CC
32	TBC 5
33	Front Wipers
34	VEH STOP
35	Blank
36	HVACB
37	Front Parking Lamps
38	Left Turn Signal
39	HVAC 1
40	TBC 4
41	Radio
42	TR PARK
43	Right Turn Signal
44	HVAC
45	Rear Fog Lamps
46	Auxiliary Power 1
47	Ignition 0
48	Four-Wheel Drive
49	Blank
50	TBC IG
51	Brakes
52	TBC RUN

List of fuses in the Rear Underseat Fuse Block (2002)

2003

Engine Compartment Fuse Block

List of fuses in the Engine Compartment Fuse Block (2003)

№	Usage
1	Electrically-Controlled Air Suspension
2	Passenger’s Side High-Beam Headlamp
3	Passenger’s Side Low-Beam Headlamp
4	Back-Up-Trailer Lamps
5	Driver’s Side High-Beam Headlamp
6	Driver’s Side Low-Beam Headlamp
7	Wash
8	Automatic Transfer Case
9	Windshield Wipers
10	Powertrain Control Module B
11	Fog Lamps
12	Stop Lamp
13	Cigarette Lighter
14	Ignition Coils
15	Air Suspension Ride
16	TBD-Ignition 1
17	Crank
18	Air Bag
19	Electric Brake
20	Cooling Fan
21	Horn
22	Ignition E
23	Electronic Throttle Control
24	Instrument Panel Cluster, Driver Information Center
25	Automatic Shift Lock Control System
26	Engine 1
27	Back-Up
28	Powertrain Control Module 1
29	Oxygen Sensor
30	Air Conditioning
31	Truck Body Controller
32	Trailer
33	Anti-Lock Brakes (ABS)
34	Ignition A
35	Blower Motor
36	Ignition B
50	Passenger’s Side Trailer Turn
51	Driver’s Side Trailer Turn
52	Hazard Flashers
Relays
37	Blank
38	Rear Window Washer
39	Fog Lamps
40	Horn
41	Fuel Pump
42	Windshield Wipers/Washer
43	High-Beam Headlamp
44	Air Conditioning
45	Cooling Fan
46	Headlamp Driver Module
47	Starter
Miscellaneous
48	Instrument Panel Battery
49	Blank

Rear Underseat Fuse Block

List of fuses in the Rear Underseat Fuse Block (2003)

№	Usage
01	Right Door Control Module
02	Left Door Control Module
03	Liftgate Module 2
04	Truck Body Controller 3
05	Rear Fog Lamps
06	Liftgate Module / Driver Seat Module
07	Truck Body Controller 2
08	Power Seats
09	Blank
10	Driver Door Module
11	Amplifier
12	Passenger Door Module
13	Rear Climate Controls
14	Left Rear Parking Lamps
15	Auxiliary Power 2
16	Vehicle Center High-Mounted Stop Lamp
17	Right Rear Parking Lamps
18	Locks
19	Blank
20	Sunroof
21	Lock
23	Blank
24	Unlock
25	Blank
26	Blank
27	OH Battery / OnStar System
29	Rainsense Wipers
30	Parking Lamps
31	Truck Body Controller 4 Cruise Control
32	Truck Body Controller 5
33	Front Wipers
34	Vehicle Stop
35	Blank
36	Heat Ventilation Air Conditioning B
37	Front Parking Lamps
38	Left Turn Signal
39	Heat Ventilation Air Conditioning 1
40	Truck Body Controller 4
41	Radio
42	Trailer Park
43	Right Turn Signal
44	Heat Ventilation Air Conditioning
45	Rear Fog Lamps
46	Auxiliary Power 1
47	Ignition 0
48	Four-Wheel Drive
49	Blank
50	Truck Body Controller Ignition
51	Brakes
52	Truck Body Controller Run

2004

Engine Compartment Fuse Block

List of fuses in the Engine Compartment Fuse Block (2004)

№	Usage
1	Electrically-Controlled Air Suspension
2	Passenger’s Side High-Beam Headlamp
3	Passenger’s Side Low-Beam Headlamp
4	Back-Up-Trailer Lamps
5	Driver’s Side High-Beam Headlamp
6	Driver’s Side Low-Beam Headlamp
7	Rear Window Washer, Headlamp Washer
8	Active Transfer Case
9	Windshield Washer
10	Powertrain Control Module B
11	Fog Lamps
12	Stop Lamp
13	Cigarette Lighter
14	Ignition Coils
15	Blank
16	TBC-Ignition 1
17	Crank
18	Air Bag
19	Trailer Electric Brake
20	Cooling Fan
21	Horn
22	Ignition E
23	Electronic Throttle Control
24	Instrument Panel Cluster, Driver Information Center
25	Automatic Shift Lock Control System
26	Backup
27	Engine 1
28	Powertrain Control Module 1
29	Oxygen Sensor
30	Air Conditioning
31	Truck Body Controller
32	Trailer
33	Anti-Lock Brakes (ABS)
34	Ignition A
35	Blower Motor
36	Ignition B
50	Passenger’s Side Trailer Turn
51	Driver’s Side Trailer Turn
52	Hazard Flashers
53	Electric Adjustable Pedal
54	A.I.R. Solenoid
56	A.I.R. Pump
Relays
37	Headlamp Washer
38	Rear Window Washer
39	Fog Lamps
40	Horn
41	Fuel Pump
42	Windshield Washer
43	High-Beam Headlamp
44	Air Conditioning
45	Cooling Fan
46	Headlamp Driver Module
47	Starter
49	Electric Adjustable Pedal
55	A.I.R. Solenoid
Miscellaneous
48	Instrument Panel Battery
49	Blank

Rear Underseat Fuse Block

List of fuses in the Rear Underseat Fuse Block (2004)

№	Usage
01	Right Door Control Module
02	Left Door Control Module
03	Liftgate Module 2
04	Truck Body Controller 3
05	Rear Fog Lamps
06	Blank
07	Truck Body Controller 2
08	Power Seats
09	Rear Wiper
10	Driver Door Module
11	Amplifier
12	Passenger Door Module
13	Rear Climate Controls
14	Left Rear Parking Lamps
15	Blank
16	Vehicle Center High-Mounted Stop Lamp
17	Right Rear Parking Lamps
18	Locks
19	Liftgate Module/Driver Seat Module
20	Sunroof
21	Lock
23	Blank
24	Unlock
25	Blank
26	Blank
27	OH Battery / OnStar System
29	Rainsense Wipers
30	Parking Lamps
31	Truck Body Controller Accessory
32	Truck Body Controller 5
33	Front Wipers
34	Vehicle Stop
35	Blank
36	Heat Ventilation Air Conditioning B
37	Front Parking Lamps
38	Left Turn Signal
39	Heat Ventilation Air Conditioning 1
40	Truck Body Controller 4
41	Radio
42	Trailer Park
43	Right Turn Signal
44	Heat Ventilation Air Conditioning
45	Rear Fog Lamps
46	Auxiliary Power 1
47	Ignition 0
48	Four-Wheel Drive
49	Blank
50	Truck Body Controller Ignition
51	Brakes
52	Truck Body Controller Run

2005

Engine Compartment Fuse Block

List of fuses in the Engine Compartment Fuse Block (2005)

№	Usage
1	Electrically-Controlled Air Suspension
2	Passenger’s Side High-Beam Headlamp
3	Passenger’s Side Low-Beam Headlamp
4	Back-Up Trailer Lamps
5	Driver’s Side High-Beam Headlamp
6	Driver’s Side Low-Beam Headlamp
7	Rear Window Washer, Headlamp Washer
8	Active Transfer Case
9	Windshield Washer
10	Powertrain Control Module B
11	Fog Lamps
12	Stoplamp
13	Cigarette Lighter
14	Ignition Coils
15	Electric Adjustable Pedals
16	Truck Body Controller, Ignition 1
17	Crank
18	Airbag
19	Trailer Electric Brake
20	Cooling Fan
21	Horn
22	Ignition E
23	Electronic Throttle Control
24	Instrument Panel Cluster, Driver Information Center
25	Automatic Shift Lock Control System
26	Engine 1
27	Backup
28	Powertrain Control Module 1
29	Oxygen Sensor
30	Air Conditioning
31	Truck Body Controller
32	Trailer
33	Anti-Lock Brakes (ABS)
34	Ignition A
35	Blower Motor
36	Ignition B
50	Passenger’s Side Trailer Turn
51	Driver’s Side Trailer Turn
52	Hazard Flashers
53	Headlamp Driver Module
54	Air Injection Reactor (AIR) Solenoid
56	Air Injection Reactor (AIR) Pump
Relays
37	Headlamp Washer
38	Rear Window Washer
39	Fog Lamps
40	Horn
41	Fuel Pump
42	Windshield Washer
43	High-Beam Headlamp
44	Air Conditioning
45	Cooling Fan
46	Headlamp Driver Module
47	Starter
49	Electric Adjustable Pedal
55	Air Injection Reactor (AIR) Solenoid
Miscellaneous
48	Instrument Panel Battery

Rear Underseat Fuse Block

List of fuses in the Rear Underseat Fuse Block (2005)

№	Usage
01	Right Door Control Module
02	Left Door Control Module
03	Liftgate Module 2
04	Truck Body Controllers
05	Rear Fog Lamps
06	Blank
07	Truck Body Controller 2
08	Power Seats
09	Rear Wiper
10	Driver Door Module
11	Amplifier
12	Passenger Door Module
13	Rear Climate Controls
14	Left Rear Parking Lamps
15	Blank
16	Vehicle Center High-Mounted Stop Lamp
17	Right Rear Parking Lamps
18	Locks
19	Liftgate Module/Driver Seat Module
20	Blank
21	Lock
23	Blank
24	Unlock
25	Blank
26	Blank
27	OnStar Overhead Battery / OnStar System
28	Sunroof
29	Rainsense Wipers
30	Parking Lamps
31	Truck Body Controller Accessory
32	Truck Body Controllers
33	Front Wipers
34	Vehicle Stop
35	Transmission Control Module
36	Heat Ventilation Air Conditioning B
37	Front Parking Lamps
38	Left Turn Signal
39	Heat Ventilation Air Conditioning 1
40	Truck Body Controller 4
41	Radio
42	Trailer Park
43	Right Turn Signal
44	Heat Ventilation Air Conditioning
45	Rear Fog Lamps
46	Auxiliary Power 1
47	Ignition 0
48	Four-Wheel Drive
49	Blank
50	Truck Body Controller Ignition
51	Brakes
52	Truck Body Controller Run

2006

Engine Compartment Fuse Block

List of fuses in the Engine Compartment Fuse Block (2006)

№	Usage
1	Electrically-Controlled Air Suspension
2	Passenger’s Side High-Beam Headlamp
3	Passenger’s Side Low-Beam Headlamp
4	Back-Up Trailer Lamps
5	Driver’s Side High-Beam Headlamp
6	Driver’s Side Low-Beam Headlamp
7	Rear Window Washer, Headlamp Washer
8	Active Transfer Case
9	Windshield Washer
10	Powertrain Control Module B
11	Fog Lamps
12	Stoplamp
13	Cigarette Lighter
14	Not Used
15	Electric Adjustable Pedals
16	Truck Body Controller, Ignition 1
17	Crank
18	Airbag
19	Trailer Electric Brake
20	Cooling Fan
21	Horn
22	Ignition E
23	Electronic Throttle Control
24	Instrument Panel Cluster, Driver Information Center
25	Automatic Shift Lock Control System
26	Engine 1
27	Backup
28	Powertrain Control Module 1
29	Oxygen Sensor
30	Air Conditioning
31	Truck Body Controller
32	Trailer
33	Anti-Lock Brakes (ABS)
34	Ignition A
35	Blower Motor
36	Ignition B
50	Passenger’s Side Trailer Turn
51	Driver’s Side Trailer Turn
52	Hazard Flashers
53	Headlamp Driver Module
54	Air Injection Reactor (AIR) Solenoid
56	Air Injection Reactor (AIR) Pump
58	Vehicle Stability Enhancement System (StabiliTrak)
Relays
37	Headlamp Washer
38	Rear Window Washer
39	Fog Lamps
40	Horn
41	Fuel Pump
42	Windshield Washer
43	High-Beam Headlamp
44	Air Conditioning
45	Cooling Fan
46	Headlamp Driver Module
47	Starter
49	Electric Adjustable Pedal
55	Air Injection Reactor (AIR) Solenoid
57	Powertrain
Miscellaneous
48	Instrument Panel Battery

Rear Underseat Fuse Block

List of fuses in the Rear Underseat Fuse Block (2006)

№	Usage
01	Right Door Control Module
02	Left Door Control Module
03	Liftgate Module 2
04	Truck Body Controllers
05	Rear Fog Lamps
06	Blank
07	Truck Body Controller 2
08	Power Seats
09	Rear Wiper
10	Driver Door Module
11	Amplifier
12	Passenger Door Module
13	Rear Climate Controls
14	Left Rear Parking Lamps
15	Blank
16	Vehicle Center High-Mounted Stop Lamp
17	Right Rear Parking Lamps
18	Locks
19	Liftgate Module / Driver Seat Module
20	Blank
21	Lock
23	Blank
24	Unlock
25	Blank
26	Blank
27	OnStar Overhead Battery / OnStar System
28	Sunroof
29	Rainsense Wipers
30	Parking Lamps
31	Truck Body Controller Accessory
32	Truck Body Controller 5
33	Front Wipers
34	Vehicle Stop
35	Transmission Control Module
36	Heat Ventilation Air Conditioning B
37	Front Parking Lamps
38	Left Turn Signal
39	Heat Ventilation Air Conditioning 1
40	Truck Body Controller 4
41	Radio
42	Trailer Park
43	Right Turn Signal
44	Heat Ventilation Air Conditioning
45	Rear Fog Lamps
46	Auxiliary Power 1
47	Ignition 0
48	Four-Wheel Drive
49	Blank
50	Truck Body Controller Ignition
51	Brakes
52	Truck Body Controller Run

2007

Engine Compartment Fuse Block

L6 Engine

List of fuses in the Engine Compartment Fuse Block (L6) (2007)

№	Usage
1	Electrically-Controlled Air Suspension
2	Passenger's Side High-Beam Headlamp
3	Passenger’s Side Low-Beam Headlamp
4	Back-Up Trailer Lamps
5	Driver’s Side High-Beam Headlamp
6	Driver’s Side Low-Beam Headlamp
7	Windshield Wiper
8	Active Transfer Case
9	Windshield Washer
10	Powertrain Control Module B
11	Fog Lamps
12	Stoplamp
13	Cigarette Lighter
15	Electric Adjustable Pedals
16	Truck Body Controller, Ignition 1
17	Crank
18	Airbag
19	Trailer Electric Brake
20	Cooling Fan
21	Horn
22	Ignition E
23	Electronic Throttle Control
24	Instrument Panel Cluster, Driver Information Center
25	Automatic Shift Lock Control System
26	Transmission Control Module Canister
27	Backup
28	Powertrain Control Module 1
29	Oxygen Sensor
30	Air Conditioning
31	Truck Body Controller 1
32	Trailer
33	Anti-lock Brakes (ABS)
34	Ignition A
35	Blower Motor
36	Blower
50	Passenger’s Side Trailer Turn
51	Driver’s Side Trailer Turn
52	Hazard Flashers
53	Headlamp Driver Module
54	Air Injection Reactor (AIR) Solenoid
56	Air Injection Reactor (AIR) Pump
58	Vehicle Stability Enhancement System (StabiliTrak)
59	Regulated Voltage Control
Relays
37	Headlamp Wiper
38	Rear Window Wiper/Washer
39	Fog Lamps
40	Horn
41	Fuel Pump
42	Windshield Washer
43	High-Beam Headlamp
44	Air Conditioning
45	Cooling Fan
46	Headlamp Driver Module
47	Starter
49	Electric Adjustable Pedal
55	Air Injection Reactor (AIR) Solenoid
57	Powertrain
Miscellaneous
48	Instrument Panel Battery

V8 Engine

List of fuses in the Engine Compartment Fuse Block (V8) (2007)

№	Usage
1	Electrically-Controlled Air Suspension
2	Passenger's Side High-Beam Headlamp
3	Passenger’s Side Low-Beam Headlamp
4	Back-Up Trailer Lamps
5	Driver’s Side High-Beam Headlamp
6	Driver’s Side Low-Beam Headlamp
7	Windshield Wiper
8	Active Transfer Case
9	Windshield Washer
10	Powertrain Control Module B
11	Fog Lamps
12	Stoplamp
13	Cigarette Lighter
14	Ignition Coils
15	Transmission Control Module (TCM) Canister Vent
16	Truck Body Controller, Ignition 1
17	Crank
18	Airbag
19	Trailer Electric Brake
20	Cooling Fan
21	Horn
22	Ignition E
23	Electronic Throttle Control
24	Instrument Panel Cluster, Driver Information Center
25	Automatic Shift Lock Control System
26	Engine 1
27	Backup
28	Powertrain Control Module 1
29	Powertrain Control Module
30	Air Conditioning
31	Injector Bank A
32	Trailer
33	Anti-lock Brakes (ABS)
34	Ignition A
35	Blower Motor
36	Ignition B
50	Passenger’s Side Trailer Turn
51	Driver’s Side Trailer Turn
52	Hazard Flashers
53	Transmission
54	Oxygen Sensor Bank B
55	Oxygen Sensor Bank A
56	Injector Bank B
57	Headlamp Driver Module
58	Truck Body Controller 1
59	Electric Adjustable Pedal
61	Vehicle Stability Enhancement System (StabiliTrak)
62	Regulated Voltage Control
Relays
37	Headlamp Wiper
38	Rear Window Wiper/Washer
39	Fog Lamps
40	Horn
41	Fuel Pump
42	Windshield Washer
43	High-Beam Headlamp
44	Air Conditioning
45	Cooling Fan
46	Headlamp Driver Module
47	Starter
49	Electric Adjustable Pedal
60	Powertrain
Miscellaneous
48	Instrument Panel Battery

Rear Underseat Fuse Block

List of fuses in the Rear Underseat Fuse Block (2007)

№	Usage
01	Passenger Door Control Module
02	Driver Door Control Module
03	Liftgate Module 2
04	Truck Body Controller 3
05	Rear Fog Lamps
06	Blank
07	Truck Body Controller 2
08	Power Seats
09	Rear Wiper
10	Driver Door Module
11	Amplifier
12	Passenger Door Module
13	Rear Climate Controls
14	Driver Side Rear Parking Lamps
15	Blank
16	Vehicle Center High-Mounted Stoplamp (CHMSL)
17	Passenger Side Rear Parking Lamps
18	Locks
19	Liftgate Module / Driver Seat Module
20	Blank
21	Lock
23	Blank
24	Unlock
25	Blank
26	Blank
27	OnStar Overhead Battery / OnStar System
28	Sunroof
29	Rainsense Wipers
30	Parking Lamps
31	Truck Body Controller Accessory
32	Truck Body Controller 5
33	Front Wipers
34	Vehicle Stop
35	Transmission Control Module
36	Heat Ventilation Air Conditioning B
37	Front Parking Lamps
38	Driver Side Turn Signal
39	Heat Ventilation Air Conditioning 1
40	Truck Body Controller 4
41	Radio
42	Trailer Park
43	Passenger Side Turn Signal
44	Heat Ventilation Air Conditioning
45	Rear Fog Lamps
46	Auxiliary Power 1
47	Ignition 0
48	Four-Wheel Drive
49	Blank
50	Truck Body Controller Ignition
51	Brakes
52	Truck Body Controller Run

2008

Engine Compartment Fuse Block

L6 Engine

List of fuses in the Engine Compartment Fuse Block (L6) (2008)

№	Usage
1	Electrically-Controlled Air Suspension
2	Passenger Side High-Beam Headlamp
3	Passenger Side Low-Beam Headlamp
4	Back-Up Trailer Lamps
5	Driver Side High-Beam Headlamp
6	Driver Side Low-Beam Headlamp
7	Windshield Wiper
8	Active Transfer Case
9	Windshield Washer
10	Powertrain Control Module B
11	Fog Lamps
12	Stoplamp
13	Cigarette Lighter
15	Electric Adjustable Pedals
16	Truck Body Controller, Ignition 1
17	Crank
18	Airbag
19	Trailer Electric Brake
20	Cooling Fan
21	Horn
22	Ignition E
23	Electronic Throttle Control
24	Instrument Panel Cluster, Driver Information Center
25	Automatic Shift Lock Control System
26	Transmission Control Module Canister
27	Backup
28	Powertrain Control Module 1
29	Oxygen Sensor
30	Air Conditioning
31	Truck Body Controller 1
32	Trailer
33	Antilock Brakes (ABS)
34	Ignition A
35	Blower Motor
36	Blower
50	Passenger Side Trailer Turn
51	Driver Side Trailer Turn
52	Hazard Flashers
53	Headlamp Driver Module
54	Air Injection Reactor (AIR) Solenoid
56	Air Injection Reactor (AIR) Pump
58	Vehicle Stability Enhancement System (StabiliTrak)
59	Regulated Voltage Control
Relays
37	Headlamp Wiper
38	Rear Window Wiper/Washer
39	Fog Lamps
40	Horn
41	Fuel Pump
42	Windshield Washer
43	High-Beam Headlamp
44	Air Conditioning
45	Cooling Fan
46	Headlamp Driver Module
47	Starter
49	Electric Adjustable Pedal
55	Air Injection Reactor (AIR) Solenoid
57	Powertrain
Miscellaneous
48	Instrument Panel Battery

V8 Engine

List of fuses in the Engine Compartment Fuse Block (V8) (2008)

№	Usage
1	Electrically-Controlled Air Suspension
2	Passenger Side High-Beam Headlamp
3	Passenger Side Low-Beam Headlamp
4	Back-Up Trailer Lamps
5	Driver Side High-Beam Headlamp
6	Driver Side Low-Beam Headlamp
7	Windshield Wiper
8	Active Transfer Case
9	Windshield Washer
10	Powertrain Control Module B
11	Fog Lamps
12	Stoplamp
13	Cigarette Lighter
14	Ignition Coils
15	Transmission Control Module (TCM) Canister Vent
16	Truck Body Controller, Ignition 1
17	Crank
18	Airbag
19	Trailer Electric Brake
20	Cooling Fan
21	Horn
22	Ignition E
23	Electronic Throttle Control
24	Instrument Panel Cluster, Driver Information Center
25	Automatic Shift Lock Control System
26	Engine 1
27	Backup
28	Powertrain Control Module 1
29	Powertrain Control Module
30	Air Conditioning
31	Injector Bank A
32	Trailer
33	Antilock Brakes (ABS)
34	Ignition A
35	Blower Motor
36	Ignition B
50	Passenger Side Trailer Turn
51	Driver Side Trailer Turn
52	Hazard Flashers
53	Transmission
54	Oxygen Sensor Bank B
55	Oxygen Sensor Bank A
56	Injector Bank B
57	Headlamp Driver Module
58	Truck Body Controller 1
59	Electric Adjustable Pedal
61	Vehicle Stability Enhancement System (StabiliTrak)
62	Regulated Voltage Control
Relays
37	Headlamp Wiper
38	Rear Window Wiper/Washer
39	Fog Lamps
40	Horn
41	Fuel Pump
42	Windshield Washer
43	High-Beam Headlamp
44	Air Conditioning
45	Cooling Fan
46	Headlamp Driver Module
47	Starter
49	Electric Adjustable Pedal
60	Powertrain
Miscellaneous
48	Instrument Panel Battery

Rear Underseat Fuse Block

List of fuses in the Rear Underseat Fuse Block (2008)

№	Usage
01	Passenger Door Control Module
02	Driver Door Control Module
03	Liftgate Module 2
04	Truck Body Controller 3
05	Rear Fog Lamps
06	Blank
07	Truck Body Controller 2
08	Power Seats
09	Rear Wiper
10	Driver Door Module
11	Amplifier
12	Passenger Door Module
13	Rear Climate Controls
14	Driver Side Rear Parking Lamps
15	Blank
16	Vehicle Center High-Mounted Stoplamp (CHMSL)
17	Passenger Side Rear Parking Lamps
18	Locks
19	Liftgate Module/Driver Seat Module
20	Blank
21	Lock
23	Blank
24	Unlock
25	Blank
26	Blank
27	OnStar Overhead Battery / OnStar System
28	Sunroof
29	Not Used
30	Parking Lamps
31	Truck Body Controller Accessory
32	Truck Body Controller 5
33	Front Wipers
34	Vehicle Stop
35	Transmission Control Module
36	Heat Ventilation Air Conditioning B
37	Front Parking Lamps
38	Driver Side Turn Signal
39	Heat Ventilation Air Conditioning 1
40	Truck Body Controller 4
41	Radio
42	Trailer Park
43	Passenger Side Turn Signal
44	Heat Ventilation Air Conditioning
45	Rear Fog Lamps
46	Auxiliary Power 1
47	Ignition 0
48	Four-Wheel Drive
49	Blank
50	Truck Body Controller Ignition
51	Brakes
52	Truck Body Controller Run

2009

Engine Compartment Fuse Block

List of fuses in the Engine Compartment Fuse Block (2009)

№	Usage
1	Electrically-Controlled Air Suspension
2	Passenger Side High-Beam Headlamp
3	Passenger Side Low-Beam Headlamp
4	Back-Up Trailer Lamps
5	Driver Side High-Beam Headlamp
6	Driver Side Low-Beam Headlamp
7	Windshield Wiper
8	Active Transfer Case
9	Windshield Washer
10	Powertrain Control Module B
11	Fog Lamps
12	Stoplamp
13	Cigarette Lighter
14	Ignition Coils
15	Transmission Control Module Canister
16	Truck Body Controller, Ignition 1
17	Crank
18	Airbag
19	Trailer Electric Brake
21	Horn
22	Ignition E
23	Electronic Throttle Control
24	Instrument Panel Cluster, Driver Information Center
25	Brake Transmission Shift Interlock
26	Engine 1
27	Backup
28	Engine Control Module 1
29	Engine Control Module
30	Air Conditioning
31	Injector A
32	Trailer
33	Antilock Brakes (ABS)
34	Ignition A
35	Blower
36	Ignition B
50	Passenger Side Trailer Turn
51	Driver Side Trailer Turn
52	Hazard Flashers
53	Transmission
54	Oxygen Sensor B
55	Oxygen Sensor A
56	Injector B
57	Headlamp Driver Module
58	Body Controller 1
59	Electric Adjustable Pedals
61	Vehicle Stability Enhancement System
62	Regulated Voltage Control
63	Air Solenoid
64	Air Pump
37	Headlamp Wiper
38	Rear Window Wiper/Washer
39	Fog Lamps
40	Horn
41	Fuel Pump
42	Windshield Washer
43	High-Beam Headlamp
44	Air Conditioning
46	Headlamp Driver Module
47	Starter
49	Electric Adjustable Pedal
60	Powertrain
69	Air Solenoid
Miscellaneous
48	Instrument Panel Battery

Rear Underseat Fuse Block

List of fuses in the Rear Underseat Fuse Block (2009)

№	Usage
01	Passenger Door Control Module
02	Driver Door Control Module
03	Liftgate Module 2
04	Truck Body Controller 3
05	Rear Fog Lamps
06	Blank
07	Truck Body Controller 2
08	Power Seats
09	Rear Wiper
10	Driver Door Module
11	Amplifier
12	Passenger Door Module
13	Rear Climate Controls
14	Driver Side Rear Parking Lamps
15	Blank
16	Vehicle Center High-Mounted Stoplamp (CHMSL)
17	Passenger Side Rear Parking Lamps
18	Locks
19	Liftgate Module / Driver Seat Module
20	Blank
21	Lock
23	Blank
24	Unlock
25	Blank
26	Blank
27	OnStar Overhead Battery / OnStar System
28	Sunroof
29	Not Used
30	Parking Lamps
31	Truck Body Controller Accessory
32	Truck Body Controller 5
33	Front Wipers
34	Vehicle Stop
35	Transmission Control Module
36	Heat Ventilation Air Conditioning B
37	Front Parking Lamps
38	Driver Side Turn Signal
39	Heat Ventilation Air Conditioning 1
40	Truck Body Controller 4
41	Radio
42	Trailer Park
43	Passenger Side Turn Signal
44	Heat Ventilation Air Conditioning
45	Rear Fog Lamps
46	Auxiliary Power 1
47	Ignition 0
48	Four-Wheel Drive
49	Blank
50	Truck Body Controller Ignition
51	Brakes
52	Truck Body Controller Run