Hyundai Sonata (2003 – 2004) – fuse box diagram
Year of production: 2003, 2004
Under hood junction box
| Description | Ampere rating [A] | Protected component |
| COND FAN | 20 | Condenser fan |
| PWR WIND | 40 | Power window |
| ABS 2 | 20 | ABS |
| IGN SW-1 | 30 | Ignition switch |
| ABS 1 | 40 | ABS |
| IGN SW-2 | 30 | Ignition switch |
| RAD FAN MTR | 30 | Radiator fan motor |
| FUEL PUMP | 20 | Fuel pump |
| HD LP LO | 15 | Headlights (LO) |
| ABS | 10 | ABS |
| INJECTOR | 10 | Injector |
| A/C COMPR | 10 | Air-con compressor |
| ATM RLY | 20 | ATM Relay |
| ECU RLY | 30 | Engine control unit relay |
| IG COIL | 20 | Ignition coil |
| O2 SNSR | 15 | Oxygen sensor |
| ECU | 15 | Engine control unit |
| HORN | 10 | Horn |
| HEAD LP HI | 15 | Headlights (HI) |
| HEAD LP WASH | 20 | — |
| DRL | 15 | DRL |
| FR FOG | 15 | Front fog lights |
| HEAD LP LO RH | 15 | Headlight (Low) |
| DIODE-1 | — | Diode 1 |
| SPARE | 30 | Spare fuse |
| SPARE | 20 | Spare fuse |
| SPARE | 15 | Spare fuse |
| SPARE | 10 | Spare fuse |
| DIODE-2 | — | Diode 2 |
| BLOWER | 30 | Blower |
| PWR FUSE-2 | 30 | Power fuse 2 |
| PWR AMP | 20 | Power amp |
| SUNROOF | 15 | Sunroof |
| TAIL LP | 20 | Tail lights |
| PWR FUSE-1 | 30 | Power fuse 1 |
| ECU | 10 | ECU |
| RR HTD | 30 | Rear window defroster |
Instrument panel junction box
| Description | Ampere rating [A] | Protected component |
| RR HTD IND | 10 | Rear window defroster, Outside rear view mirror heater |
| HAZARD | 10 | Hazard light, Turn signal lights |
| RR FOG | 15 | Rear fog light |
| A/CON | 10 | Air conditioning system |
| ETACS | 10 | ETACS, Keyless entry system, Door lock system |
| DR LOCK | 15 | Power door lock |
| P/SEAT | 25 | Power seat |
| T/LID OPEN | 15 | Remote trunk lid |
| STOP LP | 15 | Stop lights |
| H/LP | 10 | Head light |
| A/BAG IND | 10 | Air-bag |
| T/SIG | 10 | Turn signal lights |
| A/CON SW | 10 | Air conditioning system |
| ACC SOCKET | 15 | Power outlet |
| S/HTR | 15 | Seat heater |
| A/BAG | 15 | Air-bag |
| B/UP | 10 | Backup lights |
| CLUSTER | 10 | Cluster |
| START | 10 | Engine switch |
| SP1 | 15 | Spare fuse |
| SP2 | 15 | Spare fuse |
| P/SEAT (RH) | 25 | Power Seat |
| SP4 | 15 | Spare fuse |
| D/CLOCK | 10 | Digtal clock |
| TAIL(LH) | 10 | Position lights, License plate lights, Tail lights |
| AUDIO | 10 | Audio |
| WIPER | 20 | Wiper |
| ROOM LP | 10 | Dome lights, Front door edge warning lights |
| TAIL(RH) | 10 | Position lights, License plate lights, Tail lights |
| C/LIGHTER | 15 | Cigar lighter |
| EPS | 10 |
WARNING: Terminal and harness assignments for individual connectors will vary depending on vehicle equipment level, model, and market.