Fuse Box Diagrams Chevrolet TrailBlazer EXT (2003-2006)

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In this article, you will find information about the fuses of the Chevrolet TrailBlazer EXT (models 2003, 2004, and 2005), including diagrams of the fuse boxes, a list of fuses and relays, their designation, and the location of the fuse blocks within the vehicle.

Chevrolet TrailBlazer EXT (2003-2006)

Checking and Replacing Fuses in Chevy TrailBlazer EXT

The wiring circuits in your vehicle are protected from short circuits by a combination of fuses and circuit breakers. This greatly reduces the chance of fires 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!

Fuses and circuit breakers are marked with their ampere rating. Do not exceed the specified amperage rating when replacing fuses and circuit breakers. Use of an oversized fuse or circuit breaker can result in a vehicle fire.

Location of Fuse Boxes

Rear Underseat Fuse Block:
The rear underseat fuse block is located under the rear seat on the driver’s side of the vehicle. Chevrolet TrailBlazer EXT (2003-2006): Passenger compartment fuse panel location

Engine Compartment Fuse Block:
The fuse block 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 locking tabs. Remove the secondary cover by snapping off while lifting. To reinstall the fuse panel cover, reverse the sequence.

Fuse Box Diagrams

2003

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	Rear Wiper
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	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 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

Engine Compartment Fuse Block

4200 L6 Engine

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

5300 V8 Engine

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

2004

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	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	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

Engine Compartment Fuse Block

4200 L6 Engine

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

5300 V8 Engine

List of fuses in the Engine Compartment Fuse Block (V8) (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	Automatic Transfer Case
9	Windshield Washer
10	Powertrain Control Module B
11	Fog Lamps
12	Stop Lamp
13	Cigarette Lighter
14	Ignition Coils
15	Canister Vent
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
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	Oxygen Sensor Bank B
54	Oxygen Sensor Bank A
55	Injector Bank A
56	Injector Bank B
57	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
58	Ignition 1
Miscellaneous
48	Instrument Panel Battery

2005

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 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	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

Engine Compartment Fuse Block

4200 L6 Engine

List of fuses in the Engine Compartment Fuse Block (L6) (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 Washer
10	Powertrain Control Module B
11	Fog Lamps
12	Stoplamp
13	Cigarette Lighter
14	Ignition Coils
15	Electric Adjustable Pedal
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

5300 V8 Engine

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