This guide will show you the location of the fuse box on your Chevrolet Trailblazer / GMC Envoy. At the end of the article, you can also see a complete list of fuse assignments.

Make: Chevrolet, GMC
Model: Trailblazer, Envoy
Years: 2002 2003 2004 2005 2006 2007 2008 2009
Difficulty: Easy

What you will need 

Main Fuse Box - Engine Bay

trailblazer fuse box location

The main fuse block is located in the engine bay. Open the hood and look on the drivers side. You will see the fuse box. Remove the fuse box cover to access the fuses underneath.

Mini Fuses
1 ECAS
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 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 Side Trailer TRN
51 Driver Side Trailer TRN
52 Hazard Flashers

J-Case Fuses Usage

32 Trailer
33 Anti-Lock Brakes (ABS)
34 Ignition A
35 Blower Motor
36 Ignition B
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

Solid State Relays
45 Cooling Fan
46 HDM

Mini Relay Usage

47 Starter
Miscellaneous Usage
48 Instrument Panel Battery
49 Fuse Puller

Rear Underseat Fuse Block

trailblazer fuse box gmc envoy 2002 2003 2004 2005 2006

The interior fuses are located under the rear seat on the driver?s side. To access the fuses under the rear seat start by tilting the rear seat forward. Remove the cover and underneath you will see the fuses.

Fuse 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 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 TBC 4CC
32 TBC5
33 Front Wipers
34 VEH STOP
35 Blank
36 HVAC B
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

J-Case Fuses Usage
32 Trailer
33 Anti-Lock Brakes (ABS)
34 Ignition A
35 Blower Motor
36 Ignition B
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
Solid State Relays
45 Cooling Fan
46 HDM

Mini Relay Usage
47 Starter
Miscellaneous Usage
48 Instrument Panel Battery
49 Fuse Puller

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Thank you! 

Visitor
Member since 2020-07

You are the "man" thanks for this information

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Visitor
Member since 2020-07

Whats the key name for my car radio fuse on a 2002 chevy trailblazer

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Visitor
Member since 2020-07

Check fuse 41 in the rear fuse box.

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Visitor
Member since 2020-07

Front heater control cluster stopped working, ideas?

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Visitor
Member since 2020-07

trying to find the replacement interior fuse for #8 seats

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Visitor
Member since 2020-07

Okay...rained hard in my driver window last night...this morning, none of the controls work on driver door, including mirror. Passenger works. I pulled the 25 relay under the seat and swapped it, still nothing...is there another fuse I'm missing somewhere?

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Visitor
Member since 2020-07

When I turn my left signal on the hazards go on and the right signal works when it wants to. What fuses should I look at?

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Visitor
Member since 2020-07

we replaced the DDM and the power windows still don't work. This has been an issue since we replaced the battery.

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Visitor
Member since 2020-07

Same thing happened to mine Eric. The rained slips thru the creases in between buttons on your master control window switch. Your going to have to replace eventually, but in the meantime you can switch your passenger side window control lock to your driver side. Found this video on youtube. Good Luck. https://www.youtube.com/watch?v=RBNCyioHsR8

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Visitor
Member since 2020-07

Bad flasher bleeding over

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Visitor
Member since 2020-07

There's no light to see how fast I'm going? Is that a blown fuse??

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Visitor
Member since 2020-07

Here's a good one for you. We went to the dealer for an oil change today, started the car and turned the A/C on....worked for 5 seconds then stopped. I've checked Engine fuses: #35 along with J-case #44 and both seem fine. I've checked Interior fuses: #36, #39, & #44 along with J-Case: #35 & #44, all of these seem fine. When I turn the dial to anywhere from off to 5 and I can feel the A/C start but nothing coming out of the dash.

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Visitor
Member since 2020-07

which fuse is for the backlight of the license plate for a 2005 trailblazer

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zeus
Member since 2017-07

Had the same problem, problem was with the wiring harness to the blower motor. The plug connection had melted and destroyed the contacts. solution was to replace the wiring harness and plug. very common problem in trailblazer. https://www.youtube.com/watch?v=M4pka5BMoQE

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Visitor
Member since 2020-07

Fuse # for running lights?

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Visitor
Member since 2020-07

I think I need to replace the fuse for the power seat in my 2008 Chevy Trailblazer. Can someone please tell me what kind of fuse it is I need? It's not one of the mini fuses from what I've been told and that's all that comes up for part replacements. I was told it's one of the bigger silver fuses.

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Visitor
Member since 2020-07

All my dash lights are out in the instrument cluster.

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Visitor
Member since 2020-07

I have a 2003 GMC envoy an none of my gauges work on my Dash it's saying that it's an unknown driver none of my windows or my locks my Clicker when I take out one of the fuses everything works but I can't start my car and as soon as I put it back in it stops working

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Visitor
Member since 2020-07

my headlight do not work, I have changed them twice. any advise on what I need to do to get them to work 2007 chevy trailblazer ls

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Visitor
Member since 2020-07

my headlight do not work, I have changed them twice. any advise on what I need to do to get them to work 2007 chevy trailblazer ls

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