Chevrolet Express 2003 Fuse Replacement

Having an electrical issue? It could be a blown fuse — an easy fix you can do yourself.

Follow the steps below to find and replace the fuse:

Find the Fuse Box
Identify the Corresponding Fuse
Check the Fuse
How to Get a Replacement
Replace the Fuse

Step 1: Find the Fuse Box

In your Chevrolet Express 2003, the interior fuse box is typically located under the dashboard on the driver's side. Some vehicles also have an additional fuse box in the engine compartment. Check your owner's manual or the fuse box cover for the exact location.

Step 2: Identify the Corresponding Fuse

Below is the complete fuse list for your vehicle. Find the circuit that isn't working and note the fuse number and amperage.

Floor Console Fuse Box Fuse Box

Fuse #	Function	Amperage
1	Spare
2	Outside Rear View Mirror
3	Courtesy Lamp/SEO
4	Left Rear Stop/Turn Signal
5	Cargo Locks
6	Right Rear Stop/Turn Signal
7	Driver Locks
8	Stop/Center High Mounted Stop Lamp
9	Climate Control 1
10	Climate Control
11	Brakes
12	Heated Mirror/Defogger
13	Right Rear Blower
14	Driver Turn Mirror
15	Door Locks
16	Upfitter Park
17	Not Available
18	Left Rear Park Lamp
19	Pass Turn Mirror
20	Right Rear Park Lamp
21	Trailer Park Lamp
22	Front Park Lamp
32	Auxilary 1
33	Auxilary 2
CircuitBreaker	Spare
34	Power Window
Relays	Spare
23	Window Residual Accessory Power
24	Auxiliary
25	Right Rear Defogger
26	Courtesy Lamp
27	Cargo Unlock
28	Driver Unlock
29	Park Lamp
30	Door Locks
31	Passenger Unlock

Engine Compartment Fuse Box

Fuse #	Function	Amperage
1	Radio Battery
2	Gasoline: Powertrain Control Module Battery Diesel: FOH, Engine Control Module, Transmission Control Module Battery
3	Left Rear Turn Lamp
4	Right Rear Turn Lamp
5	Backup Lamps Trailer Wiring
6	Ignition 0
7	Stop Lamp
8	Right Rear Defogger/Heated Mirror
9	Right Daytime Running Lamp/Turn Signal
10	Left Daytime Running Lamp/Turn Signal
11	Truck Body Control Module 4
12	Fuel Pump
13	Trailer
14	Hazard Flashers
15	Horn
16	Truck Body Control Module 3
17	Trailer Stop/Turn Signal
18	Truck Body Control Module 2
19	Truck Body Control Module
20	Remote Function Actuator
21	Gasoline: Engine 2 Diesel: Spare
22	Ignition E
23	Engine 1
24	Truck Body Control Module Ignition 1
25	Gasoline: Spare Diesel: Fuel Heater
26	Inside Rearview Mirror
27	Crankcase
28	Brake Transmission Shift Interlock System
29	Auxiliary Power Outlets
30	Cigarette Lighter
31	Instrument Panel Cluster
32	Air Conditioning
33	Gasoline: Spare Diesel: Engine Control Module
34	Gasoline: Canister Vent Solenoid Diesel: Rear Fog Lamps
35	Spare
36	Brake Transmission Shift Interlock, Vehicle Back-Up
37	Airbag
38	Gasoline: Powertrain Control Module Ignition 1 Diesel: Engine Control Module, Transmission Control Module, Glow Plug Control Module Ignition 1
39	Gasoline: Oxygen Sensor B Diesel: Spare
40	Oxygen Sensor A
41	Windshield Wipers
42	Right Headlamp – Low Beam
43	Left Headlamp – Low Beam
44	Left Headlamp – High Beam
45	Right Headlamp – High Beam
46	Gasoline: Truck Body Controller- Accessory Diesel: Truck Body Controller, Transmission Control Module Accessory
47	Front Windshield Wiper
48	Anti-lock Brakes, Vehicle Stability Enhancement System
49	Ignition A
50	Trailer
51	Climate Control Blower
52	Ignition B
63	Gasoline: Spare Diesel: Engine Control Module Actuator
64	Spare
Relays	Spare
53	Windshield Wiper
54	Air Conditioning
55	Gasoline: Spare Diesel: Rear Fog Lamps
56	Headlamp – High Beam
57	Fuel Pump
58	Headlamp – Low Beam
59	Horn
62/SPAREGECMD	Gasoline: Spare Diesel: Engine Control Module
61/STRTR	Starter
CircuitBreaker	Spare
60/PWRSEAT	Spare	2003

Step 3: Check the Fuse

Use the plastic fuse puller, typically found in the fuse box, to remove the fuse. Hold it up to a light source. If the metal filament inside is broken or charred, the fuse is bad and needs to be replaced.

Comparison of a good fuse and a blown fuse — the blown fuse has a broken filament

Step 4: How to Get a Replacement

You can buy a replacement fuse at any auto parts store. Make sure you match the **amperage (A)** and **physical size** of the fuse exactly. For example, if you need a 20A fuse, get a 20A fuse.

Step 5: Replace the Fuse

Gently press the new fuse into the empty slot. You should feel a slight click when it's securely in place. Test the affected circuit to confirm it's working again.

What Now?

Fuse Was Blown — What to Buy

Ask at any auto parts store (AutoZone, O'Reilly, Advance Auto) for a blade fuse with the same amperage printed on the old one (e.g., 10A, 15A, 20A). Also match the physical size — mini (most modern cars), standard, or maxi. Replacement fuses cost under $5 and most stores sell assorted packs.

Fuse Looks Fine — Other Causes

If the fuse is intact, the problem isn't a blown fuse. Common alternatives include a bad relay (a click-sized electrical switch), a faulty wiring connection, or a failed component (motor, switch, module). At this point, a mechanic's diagnostic is the most reliable next step.

Frequently Asked Questions

What happens if I put in the wrong amperage fuse?

Higher amperage fuses won't protect the circuit and can cause wiring damage or fire. Lower amperage fuses will blow again immediately. Always match the exact amperage.

Why does my fuse keep blowing?

A repeatedly blown fuse indicates an underlying short circuit or overload. Replacing it again won't fix the root cause — consult a mechanic.

Do I need any tools?

Most cars come with a plastic fuse puller in the fuse box lid. If not, fine-tip needle-nose pliers work. A small flashlight helps.

How do I know what size fuse to buy?

Match the amperage printed on the old fuse (e.g., 10A, 15A, 20A) and the physical blade size (mini, standard, maxi). Auto parts stores carry assorted packs.