2020 Kia Optima Phev Fuses and Fuse Box | How To Replace
As a hybrid car, the 2020 Kia Optima PHEV depends on an intricate electrical system to function well. This complex system, along with the car’s other electrical parts, are safeguarded by a fuse box that holds a variety of fuses. Fuses are essential for protecting these electrical circuits because they “pop” or explode when an excessive current flow occurs, averting potential component damage. When a fuse blows, the circuit it is protecting is disrupted, and it must be replaced to get the circuit operating again. Usually found in the engine compartment or behind the dashboard on the driver’s side, the 2020 Kia Optima PHEV fuse box is easily accessible. There is a schematic inside the fuse box that shows the purpose and amperage rating of each fuse. Maintaining and guaranteeing the smooth operation of the vehicle’s electrical systems requires knowing how to repair a blown fuse. To help you maintain your Kia Optima PHEV in top shape, we’ve included detailed instructions on how to repair a blown fuse in the sections that follow.
FUSES
A vehicle’s electrical system is protected from electrical overload damage by fuses. This vehicle has 2 (or 3) fuse panels, one located in the driver’s side panel bolster, and 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 melt. If the electrical system does not work, first check the driver’s side fuse panel. 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 Kia dealer. Three kinds of fuses are used: blade type for lower amperage ratings, cartridge type, and multi fuse for higher amperage ratings.
WARNING – Fuse replacement
- Never replace a fuse with anything but another fuse of the same rating.
- A higher capacity fuse could cause damage and possibly a fire.
- Never install a wire or aluminium foil instead of the proper fuse even as a temporary repair. It may cause extensive wiring damage and a possible fire.
- Do not arbitrarily modify or add electric wiring to the vehicle.
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.
NOTICE
- When replacing a fuse, turn the ignition “OFF” and turn off switches of all electrical devices then remove the battery (-) terminal.
- The actual fuse/relay panel label may differ from the equipped items.
WARNING – Electrical Fire
Always ensure replacement fuses and relays are securely fastened when installed. Failure to do so can result in a vehicle fire.
CAUTION
- When replacing a blown fuse or relay, make sure the new fuse or relay fits tightly into the clips. Failure to tightly install the fuse or relay may cause damage to the wiring and electric systems.
- Do not remove fuses, relays and terminals fastened with bolts or nuts. The fuses, relays and terminals may not be fastened correctly which may cause vehicle damage.
- Do not input any other objects except fuses or relays into fuse/relay terminals, such as a driver or wiring. It may cause contact failure and system malfunction.
- Do not plug in screwdrivers or aftermarket wiring into the terminal originally designed for fuse and relays only. The electrical system and wiring of the vehicle interior may be damaged or burned due to contact failure.
- If you directly connect the wire on the taillight or replace the bulb which is over the regulated capacity to install trailers, etc., the inner junction block can get burned.
CAUTION – Random wiring is prohibited when retrofitting equipment
The use of random wiring in the vehicle might cause danger due to failure and damage to the vehicle’s performance. Using random wires especially when retrofitting the AVN or theft alarm system, remote engine control, car phone or radio, might damage the vehicle or cause fire.
CAUTION – Remodeling Prohibited
Do not rewire your vehicle in any way as doing so may affect the performance of several safe-ty features in your vehicle. Rewiring your vehicle may also void your warranty and cause you to be responsible for any subsequent vehicle damage which may result.
Inner panel fuse replacement
- Turn the engine start/stop button to the OFF position and all other switches off.
- Open the fuse panel cover.
If the switch is located in the “OFF” position, a caution indicator will be displayed in the cluster.
- Pull the suspected fuse straight out. Use the removal tool provided on the engine compartment fuse panel cover.
- Check the removed fuse; replace it if it is blown.
Spare fuses are provided 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 Kia dealer. If you do not have a spare, use a fuse of the same rating from a circuit you may not need for operating the vehicle, such as the power outlet fuse. If the headlamp, turn signal lamp, stop signal lamp, fog lamp, DRL, tail lamp, and mounted Stop Lamp 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.
NOTICE
If the headlamp, fog lamp, turn signal lamp, or tail lamp malfunctions even without any problem with the lamps, have the vehicle checked by an authorized Kia dealer.
CAUTION – Fuse Panel Covers
- Set all switches to ON before driving.
- If the vehicle is going to be unused for over 1 month, set all switches to OFF to prevent the batteries from draining.
- The contact points of the switches may wear out with excessive use. Please refrain from excessive use of the switches (except for long-term parking for over 1 month).
Fuse switch
Always set the fuse switch to the ON position before using the vehicle.
If you move the switch to the OFF position, some items such as audio and the digital clock must be reset and the transmitter (or smart key) may not work properly. When the switch is Off, the caution indicator will be displayed on the instrument cluster. Always place the fuse switch in the ON position while driving the vehicle. If the switch is located in the “OFF” position, a caution indicator will be displayed in the cluster.
Engine compartment fuse replacement
- Turn the engine start/stop button to the OFF position and all other switches off.
- Remove the fuse panel cover by pressing the tab and pulling the cover-up. When the blade-type fuse is disconnected, remove it by using the clip designed for changing fuses located in the engine compartment fuse box. Upon removal, securely insert a reserve fuse of the same rating.
- 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 Kia dealer.
CAUTION
After checking the fuse panel in the engine compartment, securely install the fuse panel cover to protect against any electrical failure which may occur from water contact. Listen for the audible clicking sound to ensure the fuse panel cover is securely fastened.
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 nuts shown in the pic-ture above.
- Replace the fuse with a new one of the same rating.
- Reverse these steps to reinstall the multi-fuse.
NOTICE
Do not disassemble nor assemble the multi-fuse when it is secured with nuts and bolts. Incorrect or partial assembly torque may cause a fire. Have the vehicle checked by an authorized Kia 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 nuts shown in the pic-ture above.
- Replace the fuse with a new one of the same rating.
- Reverse these steps to reinstall the main fuse.
NOTICE
The electronic system may not function correctly even when the engine compartment and internal fuse box’s individual fuses are not disconnected. In such a case, the cause of the problem may be the disconnection of the main fuse (BFT type), which is located inside the positive battery terminal (+) cap. Since the main fuse is designed more intricately than other parts, have the vehicle checked by an authorized Kia dealer.
CAUTION
Visually inspect the battery cap to ensure it is securely closed. If the battery cap is not securely closed, moisture may enter the system and damage the electrical components.
Fuse/relay panel description
Driver’s side fuse panel
Inside the fuse/relay panel covers, you can find the fuse/relay label describing fuse/relay name and capacity.
NOTICE
Not all fuse panel descriptions in this manual may be applicable to your vehicle. It is accurate at the time of printing. When you inspect the fuse panel in your vehicle, refer to the fuse panel label on the inside of the fuse cover.
Instrument panel (Driver’s side fuse panel)
| Fuse Name | Fuse rating | Circuit Protected |
| MODULE 7 | 10A | Surround View Monitor Unit, Front Air Ventilation Seat Control Module, Front Seat Warmer Control Module, Rear Seat Warmer Control Module |
|
MODULE 5 |
10A |
A/C Control Module, Electro Chromic Mirror, Driver IMS Module, Head Lamp LH/RH, Auto Head Lamp Leveling Device Module, Fuel Lid & Trunk Open Switch, Shift Lever Indicator, Front Air Ventilation Seat Control Module, Front Seat Warmer Control Module, Rear Seat Warmer Control Module |
| MODULE 6 | 10A | BCM, Smart Key Control Module |
| A/CON | 10A | A/C Control Module, E/R Junction Block (RLY. 4 – Blower Relay), Ionizer, Active Incar Sensor, Electronic A/C Compressor |
| START | 10A | Transmission Range Switch, Smart Key Control Module |
| A/BAG | 15A | SRS Control Module, Passenger Occupant Detection Sensor |
| MODULE 3 | 10A | BCM, Stop Lamp Switch, AFLS Unit, Keyboard, VESS Unit, A/V & Navigation Head Unit, Sport Mode Switch |
|
MODULE 4 |
10A |
Console Switch, Blind-spot Collision Warning Radar LH/RH, Parking Assist Control Module, Smart Cruise Control Unit, Lane Keeping Assist Module, Active Air Flap Unit, Electric Parking Brake Module, BMS Control Module |
|
INTERIOR LAMP |
10A |
Trunk Room Lamp, Driver/Passenger Door Lamp, Glove Box Lamp, Driver/Passenger Smart Key Outside Handle, Front Vanity Lamp Switch LH/RH, Overhead Console Lamp, Rear Personal Lamp LH/RH, Driver/Passenger Foot Lamp, Room Lamp, Center Personal Lamp |
| Fuse Name | Fuse rating | Circuit Protected |
| MDPS | 10A | MDPS Unit (Column/Rack) |
| IG1 | 25A | PCB Block (Fuse – OPCU2/ELECTRICAL WATER PUMP/TCU2/ACTIVE HYDRAULIC BOOTER 3/HEV ECU2/ECU3) |
| MODULE 9 | 10A | Smart Key Control Module |
| WASHER | 15A | Multifunction Switch (Wiper Low & Washer Switch) |
| MODULE 8 | 10A | Driver/Passenger Door Module |
| CLUSTER | 10A | Instrument Cluster |
| MULTI MEDIA | 15A | Audio, A/V & Navigation Head Unit, Keyboard |
| HTD STRG | 15A | BCM (Steering Wheel Heated) |
| MODULE 1 | 10A | Console Switch, Active Air Flap Unit, Gateway, Driver/Passenger Door Module |
| DR LOCK | 20A | Door Lock Relay, Door Unlock Relay, ICM Relay Box (Dead Lock Relay) |
| MEMORY 2 | 10A | Siren Control Module, Ultrasonic Instrusion Protection Sensor |
| SMART KEY | 15A | Smart Key Control Module |
| Fuse Name | Fuse rating | Circuit Protected |
| A/BAG IND | 10A | Instrument Cluster (Air Bag IND. Power) |
| TRUNK | 10A | Trunk Lid Relay, Fuel Filler & Trunk Open Switch, ICM Relay Box (Fuel Filler Open Relay) |
| SUNROOF 2 | 20A | Sunroof Control Unit (Roller) |
| BATTERY MANAGEMENT | 10A | BMS Control Module |
|
MEMORY 1 |
10A |
Instrument Cluster, A/C Control Module, Data Link Connector, BCM, Wireless Charger, Driver IMS Module, Rain Sensor, ICM Relay Box (Outside Mirror Folding/Unfolding Mirror Relay), Security Indicator, Auto Light & Photo Sensor, Driver/Passenger Door Module |
| FOG LAMP REAR | 10A | ICM Relay Box (Rear Fog Lamp Relay) |
| GATEWAY | 10A | Gateway |
| S/HEATER REAR | 25A | Rear Seat Warmer Control Module |
| SUNROOF 1 | 20A | Sunroof Control Unit (Glass) |
| S/HEATER FRONT | 25A | Front Air Ventilation Seat Control Module, Front Seat Warmer Control Module |
| ECS | 15A | Not Used |
|
MODULE 2 |
10A |
Audio, A/V & Navigation Head Unit, Keyboard, Wireless Charger, Surround View Monitor Unit, AMP, Power Outside Mirror Switch, Smart Key Control Module, BCM, Rear USB Charger, VESS Unit, E/R Junction Block (RLY. 7 – Power Outlet Relay) |
| Fuse Name | Fuse rating | Circuit Protected |
|
P/WDW RH |
25A |
Power Window RH Relay, Rear Safety Power Window Module LH, Rear Power Window Switch LH, Power Window Main Switch,
[LHD] Passenger Safety Power Window Module [RHD] Driver Safety Power Window Module |
| P/SEAT PASS | 30A | Passenger Seat Manual Switch, Walk In Relay Module, Passenger Reclining Limit Switch |
| AMP | 25A | AMP |
| BRAKE SWITCH | 10A | Stop Lamp Switch, Smart Key Control Module, Start/Stop Button Switch |
|
P/WDW LH |
25A |
Power Window LH Relay, Rear Safety Power Window Module RH, Rear Power Window Switch RH, Power Window Main Switch,
[LHD] Driver Safety Power Window Module [RHD] Passenger Safety Power Window Module |
| P/SEAT DRV | 30A | Driver Seat Manual Switch, Driver IMS Module |
| POWER OUTLET | 20A | Front Power Outlet #1, Front Cigarette Lighter & Power Outlet #2 |
| RR WIPER | 15A | – |
| SPARE 1 | 10A | – |
| SPARE 2 | 10A | – |
Engine compartment fuse panel (For Hybrid)
Engine compartment fuse panel (For Plug-in Hybrid)
Engine room compartment fuse panel
| Fuse Name | Fuse rating | Circuit Protected | |
|
MULTI FUSE |
MDPS 1 | 80A | MDPS Unit (Column) |
| COOLING FAN | 60A | RLY. 2 (Cooling Fan Relay) | |
| B+5 | 50A | PCB Block (Engine Control Relay, Fuse -FUEL PUMP/ECU2/TCU1/HORN/WIPER1/BATTERY C/FAN) | |
| B+3 | 50A | Smart Junction Block (IPS 2 (IPS 5), IPS 3 (IPS 6), IPS 7, IPS 8) | |
| REAR HEATED | 50A | RLY. 11 (Rear Heated Relay) | |
| ACTIVE HYDRAULIC BOOSTER 2 |
40A |
Integrated Brake Actuation Unit |
|
| BLOWER | 40A | RLY. 4 (Blower Relay) | |
| POWER OUTLET1 | 40A | RLY. 7 (Power Outlet Relay) | |
| IG2 | 30A | PCB Block (IG2 Relay) | |
| Fuse Name | Fuse rating | Circuit Protected | |
|
MULTI FUSE |
B+1 | 60A | Smart Junction Block (Fuse – TRUNK, SUNROOF2, S/HEATER REAR, SUNROOF1, P/WDW RH, P/SEAT PASS, P/WDW LH, P/SEAT DRV) |
| EEWP | 60A | Engine Electric Water Pump | |
| B+2 | 60A | Smart Junction Block (IPS 1, IPS 4, Fuse – FOG LAMP REAR, S/HEATER FRONT, AMP) | |
| ACTIVE HYDRAULIC BOOSTER 1 |
40A |
Integrated Brake Actuation Unit |
|
| IG1 | 40A | PCB Block (IG1/ACC Relay) | |
| PTC HEATER 1 | 50A | PTC HEATER | |
| Fuse Name | Fuse rating | Circuit Protected | |
|
FUSE |
EPB1 | 30A | Electric Parking Brake Module |
| H/Lamp Washer | 30A | RLY. 9 (H/Lamp Washer Relay) | |
| B+4 | 40A | Smart Junction Block (Leak Current Autocut Device Fuse – INTERIOR LAMP, MULTI MEDIA, MEM- ORY2, MEMORY1, Fuse – MODULE1, DR LOCK, SMART KEY, BRAKE SWITCH) | |
| EPB 2 | 30A | Electric Parking Brake Module | |
| OPCU 1 | 20A | Electric Oil Pump Unit | |
| DEICER | 20A | RLY. 10 (Deicer Relay) | |
| AMS | 10A | Battery Sensor | |
| HEATED MIRROR | 10A | A/C Control Module, Driver/Passenger Power Outside Mirror | |
| WIPER 2 | 10A | BCM, PCM | |
| H/LAMP HI | 20A | RLY. 6 (Head Lamp High Relay) | |
| HEV ECU 1 | 10A | HPCU | |
| OPCU2 | 10A | Electric Oil Pump Unit | |
| ELECTRICAL WATER PUMP | 10A | Electric Water Pump (HEV) | |
| Fuse Name | Fuse rating | Circuit Protected | |
|
FUSE |
FUEL PUMP | 20A | Fuel Pump Relay |
| ECU 1 | 20A | PCM | |
| SENSORS 2 | 10A | Mass Air Flow Sensor, Fuel Pump Relay, Oil Control Valve #1/#2, Canister Close Valve, Camshaft Position Sensor #1/#2, Purge Control Solenoid Valve | |
| TCU 2 | 15A | Transmission Range Switch | |
| ACTIVE HYDRAULIC BOOTER 3 |
10A |
Multipurpose Check Connector, Integrated Brake Actuation Unit |
|
| POWER OUTLET 3 | 20A | Rear Power Outlet | |
| B/UP LAMP | 10A | PCM, Transmission Range Switch, Electro Chromic Mirror, Rear Combination Lamp (IN) LH/RH | |
| OBC | 10A | HEV OBC SIG, INLET | |
| IG3 4 | 20A | IG3 1 RLY | |
| IG3 1 | 10A | HEV WATER PUMP | |
| IG3 2 | 15A | HEV OBC SIG | |
| IG3 3 | 10A | PCU, HPCU, POSITION SW, CLUSTER, BMS EXTN, AVN, IGPM, CHARGER IND | |
| Fuse Name | Fuse rating | Circuit Protected | |
|
FUSE |
SENSOR 1 | 15A | Oxygen Sensor (Up/Down), E/R Junction Block (Cooling Fan Relay) |
| IGN COIL | 20A | Ignition Coil #1/#2/#3/#4 | |
| ECU 2 | 10A | PCM | |
| TCU 1 | 10A | PCM | |
| HEV ECU 2 | 10A | HPCU, E/R Junction Block (Battery C/Fan Relay) | |
| ECU 3 | 10A | PCM | |
| POWER OUT- LET2 | 20A | Front Power Outlet #1 | |
| HORN | 20A | Horn Relay, ICM Relay Box (Burglar Alarm Horn Relay) | |
| WIPER 1 | 30A | Wiper Power Relay | |
| BATTERY C/FAN | 15A | E/R Junction Block (Battery C/Fan Relay) | |
Relay
| Relay Name | Type |
| COOLING FAN Relay | MINI |
| BLOWER Relay | MICRO |
| BATTERY C/FAN Relay | MICRO |
| H/LAMP HI Relay | MICRO |
| POWER OUTLET Relay | MICRO |
| H/LAMP WASHER Rela | MICRO |
| DEICER Relay | MICRO |
| REAR HEATED Relay | MINI |
| PTC HEATER 1 | MINI |
| PTC HEATER 2 | MINI |
| IG3 3 | MICRO |
Battery terminal cover
NOTICE
Not all fuse panel descriptions in this manual may be applicable to your vehicle. It is accurate at the time of printing. When you inspect the fuse panel in your vehicle, refer to the fuse panel label on the inside of the fuse cover.
FAQs
Fuses in the 2020 Kia Optima PHEV protect the vehicle’s electrical circuits by interrupting the flow of current when there’s an overload or fault.
The fuse box in the 2020 Kia Optima PHEV is typically located either under the dashboard on the driver’s side or in the engine compartment.
A blown fuse can usually be identified by visually inspecting the fuse element; if it’s broken or melted, the fuse is blown.
You’ll need a fuse puller tool or a pair of needle-nose pliers to safely remove and replace a blown fuse.
No, always replace a blown fuse with one of the same amperage rating to prevent electrical issues or damage.
Refer to the fuse box diagram inside your vehicle or consult your owner’s manual for the correct amperage rating for each fuse.
Some vehicles come with spare fuses stored in the fuse box, but it’s a good practice to keep a set of spare fuses on hand.
Yes, you can use a multimeter or a fuse tester to check if a fuse is still functional without removing it.
To access the fuse box in the engine compartment, you’ll usually need to remove the cover by releasing the clips or fasteners holding it in place.
If you can’t find the blown fuse, consult your owner’s manual or seek assistance from a qualified mechanic.
Common electrical issues include short circuits, faulty wiring, or malfunctioning electrical components.
While you can’t prevent blown fuses entirely, you can avoid overloading electrical circuits and ensure proper maintenance to minimize the likelihood of blown fuses.
Yes, the 2020 Kia Optima PHEV may use different types of fuses, including blade fuses and mini fuses, depending on the circuit’s requirements.
Replacing a fuse is generally a simple task that most car owners can do themselves. However, if you’re unsure or encounter difficulties, it’s wise to seek professional assistance.
Always disconnect the vehicle’s battery before working on the fuse box to ensure safety. Ensure the vehicle is parked and turned off when replacing fuses.
Useful Link
View Full PDF: Kia Optima Phev 2020 User Manual
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