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.
If you ever have a problem on the road and don't have a spare fuse, you can borrow one that has the same amperage. Just pick some feature of your vehicle that you can get along without -- like the radio or cigarette lighter-- and use its fuse, if it is the correct amperage. Replace it as soon as you can.
Engine Compartment Fuse Block
The fuse block is located under the hood in the engine compartment on the driver's side of the vehicle. See Engine Compartment Overview for more information on 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.
L6 Engine
Fuses | 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 | Blank |
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 |
53 | Electric Adjustable Pedal |
54 | A.I.R. Solenoid |
56 | A.I.R. Pump |
Relays | Usage |
37 | Blank or Headlamp Wash |
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 |
49 | Electric Adjustable Pedal |
55 | A.I.R. Solenoid |
Miscellaneous | Usage |
48 | Instrument Panel Battery |
49 | Blank |
V8 Engine
Fuses | 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 |
57 | Electric Adjustable Pedal |
Relays | Usage |
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 |
49 | Electric Adjustable Pedal |
58 | Ignition 1 |
Miscellaneous | Usage |
48 | Instrument Panel Battery |
Rear Underseat Fuse Block
Fuses | Usage |
|---|---|
01 | Right Door Control Module |
02 | Left Door Control Module |
03 | Endgate Module 2 |
04 | Truck Body Controller 3 |
05 | Blank |
06 | Roof Regulator |
07 | Truck Body Controller 2 |
08 | Power Seats |
09 | Endglass Regulator |
10 | Driver Door Module |
11 | Amplifier |
12 | Passenger Door Module |
13 | Midgate Regulator |
14 | Left Rear Parking Lamps |
15 | Auxiliary Power 2 |
16 | Vehicle Center High-Mounted Stop Lamp (CHMSL) |
17 | Right Rear Parking Lamps |
18 | Locks |
19 | Power Latch |
20 | Blank |
21 | Lock |
22 | Midgate |
23 | Endgate Module/Driver Seat Module |
24 | Unlock |
25 | Roof Module |
26 | OH Battery/OnStar |
27 | Midgate |
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 | Blank |
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 |
