2018 Hyundai Sonata Replacing Fuses | Fuse Diagrams and Relay
This tutorial will help you replace the fuses in your 2018 Hyundai Sonata. Fuses are essential parts that guard against overloads and short circuits in the electrical system of your car. A blown fuse could be the source of your electrical problems, such as broken lights or power accessories. Do not be alarmed! This article will ensure that replacing a fuse is hassle-free by taking you step-by-step through the process. This article will give you the confidence to replace the fuses in your Hyundai Sonata, regardless of your level of experience at DIY projects. Now let’s get going!
FUSES
A vehicle’s electrical system is protected from electrical overload dam-age by fuses.
This vehicle has 2 (or 3) fuse panels, one located in the driver’s side panel bolster, the other in the engine compartment near the battery.
If any of your vehicle’s lights, accessories, or controls do not work, check the appropriate circuit fuse. If a fuse has blown, the element inside the fuse will be melted or broken.
If the electrical system does not work, first check the driver’s side fuse panel. Before replacing a blown fuse, turn the engine and all switches off, and then disconnect the negative battery cable. Always replace a blown fuse with one of the same rating.
If the replacement fuse blows, this indicates an electrical problem. Avoid using the system involved and immediately consult an authorized HYUNDAI dealer.
Information
Three kinds of fuses are used: blade type for lower amperage rating, cartridge type, and fusible link for higher amperage ratings.
WARNING
NEVER replace a fuse with anything but another fuse of the same rating.
- A higher capacity fuse could cause damage and possibly cause a fire.
- Do not install a wire or aluminium foil instead of the proper fuse – even as a temporary repair. It may cause extensive wiring damage and possibly a fire.
CAUTION
Do not use a screwdriver or any other metal object to remove fuses because it may cause a short circuit and damage the system.
Instrument Panel Fuse Replacement
- Turn the engine off.
- Turn all other switches OFF.
- Open the fuse panel cover.
- Refer to the label on the inside of the fuse panel cover to locate the suspected fuse location.
- Pull the suspected fuse straight out. Use the removal tool provided in the engine compartment fuses panel.
- Check the removed fuse; replace it if it is blown. Spare fuses are provided in the instrument panel fuse panels (or in the engine compartment fuse panel).
- Push in a new fuse of the same rating, and make sure it fits tightly in the clips. If it fits loosely, consult an authorized HYUNDAI dealer.
In an emergency, if you do not have a spare fuse, use a fuse of the same rating from a circuit you may not need for operating the vehicle, such as the cigarette lighter fuse.
If the headlamps or other electrical components do not work and the fuses are OK, check the fuse panel in the engine compartment. If a fuse is blown, it must be replaced with the same rating.
Fuse switch
Always, place the fuse switch to the ON position.
If you move the switch to the OFF position, some items such as the audio system and digital clock must be reset and the smart key may not work properly.
Information
If the fuse switch is OFF, the above message will appear.
NOTICE
- Always place the fuse switch in the ON position while driving the vehicle.
- Do not move the transportation fuse switch repeatedly. The fuse switch may be damaged.
Engine Compartment Panel Fuse Replacement
- Turn the engine off.
- Turn all other switches OFF.
- Remove the fuse panel cover by pressing the tap and pulling up.
- Check the removed fuse; replace it if it is blown. To remove or insert the fuse, use the fuse puller in the engine compartment fuse panel.
- Push in a new fuse of the same rating, and make sure it fits tightly in the clips. If it fits loosely, consult an authorized HYUNDAI dealer.
Main fuse
If the main fuse is blown, it must be removed as follows:
- Turn off the engine.
- Disconnect the negative battery cable.
- Remove the fuse panel cover by pressing the tab and pulling it up.
- Remove the nuts shown in the picture above.
- Replace the fuse with a new one of the same rating.
- Reinstall in the reverse order of removal.
Information
If the main fuse is blown, consult an authorized HYUNDAI dealer.
Multi fuse
If the multi fuse is blown, it must be removed as follows:
- Turn off the engine.
- Disconnect the negative battery cable.
- Remove the fuse panel cover by pressing the tab and pulling it up.
- Remove the nuts shown in the picture above.
- Replace the fuse with a new one of the same rating.
- Reinstall in the reverse order of removal.
Information
If the multi fuse is blown, consult an authorized HYUNDAI dealer.
Fuse/Relay Panel Description
Instrument panel fuse panel
Inside the fuse/relay box cover, you can find the fuse/relay label describing fuse/relay name and capacity.
Information
Not all fuse panel descriptions in this manual may be applicable to your vehicle; the information is accurate at the time of printing. When you inspect the fuse box on your vehicle, refer to the fuse box label.
Instrument panel fuse panel
|
Fuse Name |
Fuse rating |
Protected Component |
| SAFETY WINDOW LH | 25A | Driver Safety Power Window Module |
| P/SEAT PASS | 30A | Passenger Seat Manual Switch |
| P/WDW LH | 20A | Power Window Main Switch, Rear Power Window Module LH |
| P/WDW RH | 25A | Power Window Main Switch, Rear Power Window Module RH, Passenger Door Module, Passenger Power Window Switch |
| DR LOCK | 20A | Door Lock Relay, Door Unlock Relay |
| S/HEATER FRT | 25A | Front Air Ventilation Seat Module, Front Seat Warmer Module |
| BRAKE SWITCH | 10A | Stop Lamp Switch, Immobilizer Module, Smart Key Control Module |
| 8 MODULE | 7.5A | BCM, Smart Key Control Module |
| SAFETY POWER WINDOW RH | 25A | Passenger Safety Power Window Module |
| SMART KEY | 15A | Smart Key Control Module |
| TRUNK | 10A | Trunk Lid Relay, Fuel Filler Door & Trunk Lid Switch |
| 7 MODULE | 10A | Digital Clock, Driver/Passenger Door Module |
| INTERIOR LAMP | 10A | Ignition Key Ill. & Door Warning Switch, Front Vanity Lamp Switch LH/RH,
Overhead Console Lamp, Room Lamp, Rear Personal Lamp LH/RH, Trunk Room Lamp, Driver/Passenger Smart Key Outside Handle |
| 2 MEMORY | 7.5A | Not used |
| P/SEAT DRV | 30A | Driver Seat Manual Switch, Driver IMS Module |
| CLUSTER | 10A | Instrument Cluster |
| Fuse Name | Fuse rating | Protected Component |
| 4 MODULE | 10A | Immobilizer Module, Smart Key Control Module |
| MULTI MEDIA | 15A | A/V & Navigation Head Unit |
| 1 MEMORY | 10A | Driver/Passenger Door Module, Driver IMS Module, A/C Control Module, Auto Light & Photo Sensor, Electro Chromic Mirror, Instrument Cluster,
Tire Pressure Monitoring Module, Digital Clock, Wireless Charger, A/V & Navigation Head Unit |
| S/HEATER RR | 25A | Rear Seat Warmer Module |
| 2 SUN ROOF | 20A | Panoramic Sunroof Motor |
| 9 MODULE | 7.5A | Front Air Ventilation Seat Module, Front Seat Warmer Module, Rear Seat Warmer Module |
| MDPS | 7.5A | MDPS Unit (Column Type/Rack Type) |
| 3 MODULE | 10A | BCM, Sport Mode Switch, Stop Lamp Switch |
| 1 MODULE | 7.5A | Key Solenoid, Driver/Passenger Door Module |
| 1 SUN ROOF | 20A | [With Panorama] Panorama Sunroof Motor [W/O Panorama] Sunroof Motor |
| A/CON | 7.5A | A/C Control Module, E/R Junction Block (Blower Relay) |
| 2 MODULE | 10A | A/V & Navigation Head Unit, Digital Clock, USB Charger, BCM, AMP, Power Outside Mirror Switch, Wireless Charger, Smart Key Control Module, Overhead Console Lamp, E/R Junction Block (Power Outlet Relay) |
| A/BAG IND | 7.5A | Instrument Cluster |
| 6 MODULE | 10A | Multipurpose Check Connector, A/C Control Module, A/V & Navigation Head Unit,
Front Air Ventilation Seat Module, Front Seat Warmer Module, Rear Seat Warmer Module, Driver IMS Module, Head Lamp LH/RH (DBL), A/T Shift Lever IND. |
| AMP | 25A | AMP (JBL/MOBIS) |
| Fuse Name | Fuse rating | Protected Component |
| HTD STRG | 15A | BCM |
| 5 MODULE | 10A | Front Console Switch, Tire Pressure Monitoring Module, Lane Keeping Assist Module, Smart Cruise Control Unit, Fuel Filler Door & Trunk Lid Switch, AEB Module,
Head Lamp LH/RH (DBL), Rear Parking Assist Sensor LH/RH, Rear Parking Assist Sensor LH/RH (Center), Blind Spot Detection Radar LH/RH |
| IG1 | 25A | PCB Block (Fuse – VACUUM PUMP2/ TCU2/ ECU3/ ABS3) |
| WASHER | 15A | Multifunction Switch (Wiper Low & Washer Switch) |
| POWER OUTLET | 20A | Front Power Outlet |
| A/BAG | 15A | SRS Control Module, Occupant Detection Sensor |
| START | 7.5A | [W/O Smart Key & IMMO.] ICM Relay Box (Burglar Alarm Relay) [With Smart Key / IMMO.]
Transaxle Range Switch, PCM (G4KJ/G4KH) |
| 10 MODULE | 10A | BCM |
Engine compartment fuse panel
Inside the fuse/relay box cover, you can find the fuse/relay label describing fuse/relay name and capacity.
Information
Not all fuse panel descriptions in this manual may be applicable to your vehicle; the information is accurate at the time of printing. When you inspect the fuse panel in your vehicle, refer to the fuse panel label. 
Engine compartment main fuse panel
| Fuse Name | Fuse rating |
Protected Component | |
| MULTI FUSE (TYPE A) | IG2 | 30A | [Without Smart Key] (Start Relay), Ignition Switch, [With Smart Key] (Start Relay), PCB Block (IG2 Relay) |
| 3 TCU | 40A | [G4FJ – DCT] TCM | |
| BLOWER | 40A | (Blower Relay) | |
| 1 ABS | 40A | ESC Module | |
| REAR HEATED | 50A | (Rear Heated Relay) | |
| 1 B+ | 50A | Smart Junction Block (IPS2 (4CH), IPS3 (4CH)) | |
| 1 COOLING FAN | 50A | [G4KH/G4FJ] (Cooling Fan Relay), [G4KJ] (Cooling Fan Relay) | |
| 2 COOLING FAN | 60A | [G4KH/G4FJ] (Cooling Fan Relay) | |
| 1 MDPS | 80A | MDPS Unit (Column Type) | |
| MULTI FUSE (TYPE B) | 2 ABS | 30A | ESC Module, Multipurpose Check Connector |
| IG1 | 40A | [Without Smart Key] Ignition Switch, [With Smart Key] PCB Block (IG1/ACC Relay) | |
| 4 TCU | 40A | [G4FJ – DCT] TCM | |
| 3 POWER OUTLET | 40A | (Power Outlet Relay) | |
| 2 B+ | 50A | Smart Junction Block (IPS1 (4CH), IPS4 (4CH), IPS5 (4CH), IPS6 (2CH), IPS7 (1CH),
Fuse – AMP) |
|
| 5 B+ | 60A | PCB Block (Engine Control Relay, Fuse – TUC1, ECU1, HORN, AMS, WIPER) | |
| 1 B+ | 60A | Smart Junction Block (Power Window Relay, Fuse – SAFETY POWER WINDOW LH, P/SEAT PASS,SAFETY POWER WINDOW RH, P/SEAT DRV, MODULE1, P/WDW LH, P/WDW RH, TRUNK, S/HEATER RR, SUNROOF2, SUNROOF1) | |
| 2 MDPS | 100A | MDPS Unit (Rack Type) | |
| Fuse Name | Fuse rating | Protected Component | |
| FUSE | 3 E-CVVT | 20A | [G4KJ/G4KH] PCM |
| 2 E-CVVT | 20A | [G4KJ/G4KH] PCM | |
| FUEL PUMP | 20A | (Fuel Pump Relay) | |
| H/LAMP HI | 20A | [With HID] (Head Lamp High Relay) | |
| 1 VACUUM PUMP | 20A | [G4KH/G4FJ] Vacuum Pump | |
| 1 E-CVVT | 40A | [G4KJ/G4KH] (E-CVVT Relay) | |
| 4 B+ | 40A | Smart Junction Block (Leak Current Auto-cut Device Fuse – INTERIOR LAMP, MULTI MEDIA, MEMORY1, Fuse – DOOR LOCK, S/HEATER FR, BRAKE SWITCH, SMART KEY, MODULE10) | |
| A/CON | 10A | A/C Control Module | |
| HEATED MIRROR | 10A | ECM (G4FJ), A/C Control Module, Drover/Passenger Power Outside Mirror | |
Engine compartment main fuse panel – PCB Block
| Fuse Name | Fuse rating | Protected Component | |
|
FUSE |
2 VACUUM PUMP | 10A | [G4KH/G4FJ] Vacuum Pump, Vacuum Switch |
| 3 ECU | 10A | PCM/ECM | |
| 1 POWER OUTLET | 20A | Front Cigarette Lighter & Power Outlet #2 | |
| FUEL PUMP | 20A | Fuel Pump Relay | |
| HORN | 20A | Horn Relay, ICM Relay Box (Burglar Alarm Horn Relay) | |
| WIPER | 30A | Front Wiper (Low) Relay, Front Wiper (High) Relay | |
| 2 TCU | 15A | Transmission Range Switch, TCM (G4FJ-DCT) | |
| 3 ABS | 10A | ESC Module | |
| 2 POWER OUTLET | 20A | Rear Power Outlet | |
|
B/UP LAMP |
10A | Transmission Range Switch, PCM (G4KJ/G4KH-A/T), TCM (G4FJ-DCT), Electro Chromic Mirror, Rear Combination Lamp (IN) LH/RH | |
| 1 SENSOR | 15A | Oxygen Sensor (Up/Down) | |
| 2 SENSOR | 15A | Purge Control Solenoid Valve, Canister Close Valve, RCV Control Solenoid Valve, Fuel Pump Relay, E/R Junction Block (Cooling Fan High Relay, Fuel Pump Relay), [G4KJ/G4KH] Variable Intake Solenoid Valve, Oil Control Valve (Exhaust), [G4FJ] Oil Control Valve #1/#2 (Intake/Exhaust) |
|
| 1 ECU | 10A | PCM/ECM | |
| 1 TCU | 10A | PCM (G4KJ/G4KH-A/T), TCM (G4FJ-DCT) | |
| 1 ECU | 10A | PCM/ECM | |
| IGN COIL | 20A | Ignition Coil #1/#2/#3/#4 | |
| INJECTOR | 15A | Not Used | |
| AMS | 10A | Battery Sensor | |
FAQs
In a 2018 Hyundai Sonata, the fuse box is usually found on the driver’s side under the dashboard or in the engine bay.
For the engine bay fuse box, you might need to open the hood; for the interior fuse box, look for a panel under the dashboard on the driver’s side.
Typically, all you need is a fuse puller tool that comes with your car’s fuse box or a pair of needle-nose pliers.
A blown fuse will show signs of melting or disconnecting, or it will have a damaged filament inside.
Replacing a fuse with a higher amperage is not advised since it may cause damage to the electrical system or perhaps present a fire hazard.
No, swapping out a fuse for a lower amperage fuse may cause the new one to explode too soon or not protect you enough.
Fuse diagrams are frequently available online via vehicle forums or the website of the manufacturer. If not, you might need to speak with a dealership or a licensed mechanic.
While it’s normally not required, unplugging the battery is a smart precaution to prevent unintentional short circuits when changing a fuse.
Gently grip the blown fuse and pull it straight out of the socket using a fuse puller tool or a pair of needle-nose pliers.
Keep your hands away from the metal components of the fuses to avoid electric shocks or fuse damage.
Yes, a fuse’s transparent window on top allows you to see through it to visually inspect it most of the time. It’s possible that the fuse is fine if the metal strip inside looks intact.
If changing the fuse doesn’t resolve the problem, there might be a more serious electrical issue that needs to be professionally diagnosed and fixed.
Spare fuses for certain cars are kept in an adjacent compartment or in the fuse box. For a list of extra fuses, consult the fuse box or your owner’s handbook.
Most car owners can perform the safe and easy task of replacing fuses on their own. However, it’s better to get help from a qualified mechanic if you’re unsure of yourself or feel uneasy working with electrical systems.
Useful Links
View Full PDF: 2018 Hyundai Sonata Owner’s Manual| Auto User Guide
2023 Hyundai Sonata Specs, Price, Features, Milage (Brochure)