Chevrolet Suburban 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:
Step 1: Find the Fuse Box
In your Chevrolet Suburban 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.
Instrument Panel Fuse Box
| Fuse # | Function | Amperage |
|---|---|---|
| RRWiper | Rear Window Wiper Switch | |
| SEOACCY | Special Equipment Option Accessory | |
| WSWPR | Windshield Wipers | |
| TBCACCY | Truck Body Controller Accessory | |
| IGN3 | Ignition, Heated Seats | |
| 4WD | Four-wheel Drive System, Auxiliary Battery | |
| HTRA/C | Climate Control System | |
| LOCK | Power Door Lock Relay (Lock Function) | |
| HVAC1 | Inside Rearview Mirror, Climate Control System | |
| LDOOR | Driver’s Door Harness Connection | |
| CRUISE | CRUISE Control | |
| UNLOCK | Power Door Lock Relay (Unlock Function) | |
| RRFOGLP | Rear Fog Lamp (Export Only) | |
| BRAKE | Anti-Lock Brake System | |
| DRIVERUNLOCK | Power Door Lock Relay (Drive’s Door Unlock Function) | |
| IGN0 | PCM, TCM | |
| TBCIGN0 | Truck Body Controller | |
| VEHCHMSL | Vehicle and Trailer High Mounted Stoplamp | |
| LTTRLRST/TRN | Left Turn Signal/Stop Trailer | |
| LTTRN | Left Turn Signals and Sidemarkers | |
| VEHSTOP | Vehicle Stoplamps, Brake Module, Electronic Throttle Control Module | |
| RTTRLRST/TRN | Right Turn Signal/Stop Trailer | |
| RTTRN | Right Turn Signals and Sidemarkers | |
| BODY | Harmess Connector | |
| DDM | Driver Door Module | |
| AUXPWR2 | Rear Cargo Area Power Outlet | |
| LOCKS | Power Door Lock System | |
| TBC2C | Truck Body Controller | |
| FLASH | Flasher Module | |
| CBLTDOORS | Left Power Window Circuit Breaker | |
| TBC2B | Truck Body Controller | |
| TBC2A | Truck Body Controller |
Center instrument panel relay box Fuse Box
| Fuse # | Function | Amperage |
|---|---|---|
| SEO | Special Equipment Option | |
| TRAILER | Trailer Brake Wiring | |
| UPFIT | Upfitter (Not Used) | |
| SLRIDE | Ride Control Harness Connection | |
| HDLR2 | Headliner Wiring Connector | |
| BODY | Body Wiring Connector | |
| HDLNR1 | Headliner Wiring Connector 1 | |
| SPARERELAY | Not Used | |
| CBSEAT | Driver and Passenger Seat Module Circuit Breaker | |
| CBRTDOOR | Right Power Window Circuit Breaker | |
| SPARE | Not Used | |
| INFO | Infotainment Harness Connection |
Engine Compartment Fuse Box
| Fuse # | Function | Amperage |
|---|---|---|
| GLOWPLUG | Not Used | |
| CUSTFEED | Gasoline Accessory Power | |
| HYBRID | Hybrid | |
| STUD1 | Auxiliary Power (Single Battery and Diesels Only)/Dual Battery (TP2) Do not install fuse. | |
| MBEC | Mid Bussed Electrical Center Power Feed, Front Seats, Right Doors | |
| BLOWER | Front Climate Control Fan | |
| LBEC | Left Bussed Electrical Center, Door Modules, Door Locks, Auxiliary Power Outlet-Rear Cargo Area and Instrument Panel | |
| STUD2 | Accessory Power/Trailer Wiring Brake Feed | |
| ABS | Anti-Lock Brakes | |
| VSES/ECAS | Vehicle Stability | |
| IGNA | Iqnition Power | |
| IGNB | Iqnition Power | |
| LBEC1 | Left Bussed Electrical Center, Left Door, Truck Body Controller, Flasher Module | |
| TRLPARK | Parking Lamps, Trailer Wiring | |
| RRPARK | Right Rear Parking and Sidemarker Lamps | |
| LRPARK | Left Rear Parking and Sidemarker Lamps | |
| PARKLP | Parking Lamps Relay | |
| STARTER | Starter Relay | |
| INTPARK | Interior Lamps | |
| STOPLP | Stoplamps | |
| TBCBATT | Truck Body Controller Battery Feed | |
| SUNROOF | Sunroof | |
| SEOB2 | Off-Road Lamps | |
| 4WS | Vent Solenoid Canister/QUADRASTEER Module Power | |
| RRHVAC | Rear Climate Control | |
| AUXHVAC | Auxiliary Power Outlet – Console | |
| IGN1 | Ignition Relay | |
| PCM1 | Powertrain Control Module | |
| ETC/ECM | Electronic Throttle Control, Electronic Brake Controller | |
| IGNE | Instrument Panel Cluster, Air Conditioning Relay, Turn Signal/Hazard Switch, Starter Relay | |
| RTD | Ride Control | |
| TRLB/U | Backup Lamps Trailer Wiring | |
| PCMB | Powertrain Control Module, Fuel Pump | |
| F/PMP | Fuel Pump (Relay) | |
| B/ULP | Back-up Lamps, Automatic Transmission Shift Lock Control System | |
| RRDEFOG | Rear Window Defogger | |
| HDLP-HI | Headlamp High Beam Relay | |
| PRIME | Not Used | |
| AIRBAG | Supplemental Inflatable Restraint System | |
| FRTPARK | Front Parking Lamps, Sidemarker Lamps | |
| DRL | Daytime Running Lamps (Relay) | |
| SEOIGN | Rear Defog Relay | |
| TBCIGN1 | Truck Body Controller Ignition | |
| HIHDLP-LT | High Beam Headlamp-Left | |
| LHHID | Not Used | |
| DRL | Daytime Running Lamps | |
| IPC/DIC | Instrument Panel Cluster/Driver Information Center | |
| HVAC/ECAS | Climate Control Controller | |
| CIGLTR | Cigarette Lighter | |
| HIHDLP-RT | High Beam Headlamp-Right | |
| HDLP-LOW | Headlamp Low Beam Relay | |
| A/CCOMP | Air conditioning Compressor | |
| A/CCOMP | Air conditioning Compressor Relay | |
| RRWPR | Rear Wiper/Washer | |
| RADIO | Audio System | |
| SEOB1 | Mid Bussed Electrical Center, HomeLink, Rear Heated Seats | |
| LOHDLP-LT | Headlamp Low Beam-Left | |
| BTSI | Brake Transmission Shift Interlock System | |
| CRANK | Starting System | |
| LOHDLP-RT | Headlamp Low Beam-Right | |
| FOGLP | Fog lamp Relay | |
| FOGLP | Fog Lamp | |
| HORN | Horn Fuse | |
| HORN | Horn Relay | |
| W/SWASH | Windshield and Rear Window Washer Pump Relay | |
| W/SWASH | Windshield and Rear Window Washer Pump | |
| INFO | OnStar/Rear Seat Entertainment | |
| RADIOAMP | Radio Amplifier | |
| RHHID | Not Used | |
| EAP | Electric Adjustable Pedals | |
| TREC | All-Wheel Drive Module | |
| SBA | Supplemental Brake Assist | |
| INJ2/15A | Fuel Injection Rail #2 | |
| INJ1/15A | Fuel Injection Rail #1 | |
| 02A/15A | Oxygen Sensors | |
| 02B/15A | Oxygen Sensors | |
| IGN1 | Ignition 1 | |
| ECMRPV/15A | Engine Control Module | |
| FUELHT/15A | Fuel Heater | |
| ECMI/15A | Engine Control Module |
Center instrument panel relay box Fuse Box
| Fuse # | Function | Amperage |
|---|---|---|
| SEO | Special Equipment Option | |
| TRAILER | Trailer Brake Wiring | |
| UPFIT | Upfitter (Not Used) | |
| SLRIDE | Ride Control Harness Connection | |
| HDLR2 | Headliner Wiring Connector | |
| BODY | Body Wiring Connector | |
| HDLNR1 | Headliner Wiring Connector 1 | |
| SPARERELAY | Not Used | |
| CBSEAT | Driver and Passenger Seat Module Circuit Breaker | |
| CBRTDOOR | Right Power Window Circuit Breaker | |
| SPARE | Not Used | |
| INFO | Infotainment Harness Connection |
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.
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.