Fuse Box Diagram GMC Envoy (2002-2009)

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In this article, we consider the second-generation GMC Envoy, produced from 2002 to 2009. Here you will find fuse box diagrams of GMC Envoy 2002, 2003, 2004, 2005, 2006, 2007, 2008 and 2009, get information about the location of the fuse panels inside the car, and learn about the assignment of each fuse (fuse layout) and relay.

See other GMC Envoy:

GMC Envoy (1998-2000)…>>

Fuse Layout GMC Envoy 2002-2009

Cigar lighter (power outlet) fuses are the fuse #13 (Cigarette Lighter) in the Engine compartment fuse box, and fuses #15 (2002-2004: Auxiliary Power 2), #46 (Auxiliary Power 1) in the Rear Underseat Fuse Block.

Table of Contents

Fuse box location

Rear Underseat Fuse Block

It is located under the rear seat on the driver’s side of the vehicle (tilt the seat up, remove the fuse box cover).

Engine compartment fuse box

It is located under the hood in the engine compartment on the driver’s side of the vehicle.

Remove the primary cover by pressing the two lockingtabs. Remove the secondary cover by snapping offwhile lifting.

Fuse box diagrams

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2002

Engine compartment

Assignment of the fuses in the engine compartment (2002)

№	Usage
Mini Fuses
1	ECAS
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

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/Washer
43	High-Beam Headlamp
44	Solid State

Solid State Relays
45	Cooling Fan
46	HDM

Mini Relays
47	Starter

Miscellaneous
48	Instrument Panel Battery
49	Fuse Puller

Rear Underseat Fuse Block

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

№	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	HVAC B
37	Front Parking Lamps
38	Left Turn Signal
39	HVAC1
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

2003, 2004

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Engine compartment (L6 Engine)

Assignment of the fuses in the engine compartment, L6 Engine (2003, 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	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

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Engine compartment (V8 Engine)

Assignment of the fuses in the engine compartment, V8 Engine (2003, 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	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	Cannister Vent
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
30	Air Conditioning
31	Truck Body Controller 1
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	Oxygen Sensor Bank A
54	Oxygen Sensor Bank B
55	Injector Bank A
56	Injector Bank B

Relays
37	Headlamp Washer
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
58	Ignition 1

Miscellaneous
48	Instrument Panel Battery

Rear Underseat Fuse Block (Envoy)

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Assignment of the fuses in the Rear Underseat Fuse Block, Envoy (2003, 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	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

Rear Underseat Fuse Block (Envoy XL)

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Assignment of the fuses in the Rear Underseat Fuse Block, Envoy XL (2003, 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	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 Parting 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
22	Retained Accessory Power
23	Blank
24	Unlock
25	Blank
26	Blank
27	OH Battery/OnStar System
28	Sunroof
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

2005

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Engine compartment (L6 Engine)

Assignment of the fuses in the engine compartment, L6 Engine (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	Automatic Transfer Case
9	Windshield Wipers
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	Foglamps
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

Engine compartment (V8 Engine)

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Assignment of the fuses in the engine compartment, V8 Engine (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	Automatic Transfer Case
9	Windshield Wipers
10	Powertrain Control Module B
11	Fog Lamps
12	Stop Lamp
13	Cigarette Lighter
14	Ignition Coils
15	Cannister Vent
16	Truck Body Controller, 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	Engine 1
27	Back-Up
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

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
60	Powertrain

Miscellaneous
48	Instrument Panel Battery

Rear Underseat Fuse Block (Envoy)

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Assignment of the fuses in the Rear Underseat Fuse Block, Envoy (2005)

№	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	Blank
21	Lock
23	Blank
24	Unlock
25	Blank
26	Blank
27	OH Battery/OnStar System
28	Sunroof
29	Rain sense Wipers
30	Parking Lamps
31	Truck Body Controller 4 Cruise Control
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

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Rear Underseat Fuse Block (Envoy XL)

Assignment of the fuses in the Rear Underseat Fuse Block, Envoy XL (2005)

№	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	Vent Window
21	Lock
22	Retained Accessory Power
23	Blank
24	Unlock
25	Blank
26	Blank
27	OH Battery/OnStar System
28	Sunroof
29	Rainsense Wipers
30	Parking Lamps
31	Truck Body Controller Cruise Control
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
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
BLANK	Blank
BLANK	Blank
BLANK	Blank
BLANK	Blank
BLANK	Blank
BLANK	Blank

2006

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Engine compartment (L6 Engine)

Assignment of the fuses in the engine compartment, L6 Engine (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 Wipers
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	Passengers Side Trailer Turn
51	Drivers 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

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Engine compartment (V8 Engine)

Assignment of the fuses in the engine compartment, V8 Engine (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	Automatic Transfer Case
9	Windshield Wipers
10	Powertrain Control Module B
11	Fog Lamps
12	Stop Lamp
13	Cigarette Lighter
14	Ignition Coils
15	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	Passengers Side Trailer Turn
51	Drivers 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

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
60	Powertrain
61	Vehicle Stability Enhancement System (StabiliTrak®)

Miscellaneous
48	Instrument Panel Battery

Rear Underseat Fuse Block (Envoy)

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Assignment of the fuses in the Rear Underseat Fuse Block, Envoy (2006)

№	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	Blank
21	Lock
23	Blank
24	Unlock
25	Blank
26	Blank
27	OH Battery/OnStar System
28	Sunroof
29	Rainsense Wipers
30	Parking Lamps
31	Truck Body Controller Cruise Control
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

Rear Underseat Fuse Block (Envoy XL)

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Assignment of the fuses in the Rear Underseat Fuse Block, Envoy XL (2006)

№	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	Vent Window
21	Lock
22	Retained Accessory Power
23	Blank
24	Unlock
25	Blank
26	Blank
27	OH 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
BLANK	Blank
BLANK	Blank
BLANK	Blank
BLANK	Blank
BLANK	Blank
BLANK	Blank

2007, 2008, 2009

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Engine compartment (L6 Engine)

Assignment of the fuses in the engine compartment, L6 Engine (2007, 2008, 2009)

№	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 Wipers
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
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 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

Engine compartment (V8 Engine)

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Assignment of the fuses in the engine compartment, V8 Engine (2007, 2008, 2009)

№	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	Automatic Transfer Case
9	Windshield Wipers
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	Airhag
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 Washer
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

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Assignment of the fuses in the Rear Underseat Fuse Block (2007, 2008, 2009)

№	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	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

Learn more:

How to check the fuses?

How to replace a blown fuse?

Why do car fuses blow?

Types of automotive fuses

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