Fuse Diagrams: 2018 Kia Optima Phev Fuses and Relay Guide
Let’s learn more about electricity as we look into the complicated world of 2018 Kia Optima PHEV Fuse Diagrams and the secrets of its Fuses and Relays system. This complete guide will help you find your way through the maze of circuits and links, giving you a clear idea of how to handle possible electrical problems or fuse replacements. The Fuse Diagrams show what important role each fuse and switch plays in keeping different parts, like power windows and engine control units, working at their best. This guide will help you understand, fix problems with, and effectively manage the 2018 Kia Optima PHEV’s electrical environment, no matter how experienced you are with cars or how new you are to doing your own maintenance. Get ready to understand the switch box better and enjoy driving more once you know more about how the car’s electricity works.
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FUSES
Left side: Normal
Right side: Blown
- 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, the others 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.
- Before replacing a blown fuse, 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 a professional workshop. Kia recommends to consult an authorised Kia dealer/service partner.
- Three kinds of fuses are used: blade type for lower amperage rating, 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 aluminum 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 on electric wiring of 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
The actual fuse/relay panel label may differ from the equipped items.
CAUTION
- When replacing a blown fuse or relay with a new one, make sure the new fuse or relay fits tightly into the clips. The incomplete fastening fuse or relay may cause the vehicle wiring and electric systems damage and a possible fire.
- Do not remove fuses, relays and terminals fastened with bolts or nuts. The fuses, relays and terminals may be fastened incompletely, and it may cause a possible fire. If fuses, relays and terminals fastened with bolts or nuts are blown, consult a professional work-shop. Kia recommends consulting an authorised Ki dealer /service partner.
- 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.
Inner panel fuse replacement
- Turn the ignition switch and all other switches off.
- Open the fuse panel cover.
If the switch is located in the “OFF”, caution will be displayed in the cluster.
- Pull the suspected fuse straight out. Use the removal tool provided in the main fuse box in the engine compartment.
- Check the removed fuse; replace it if it is blown.
Spare fuses are provided in the instrument panel fuse panel (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 a professional workshop. Kia recommends to consult an authorised Kia dealer/service partner.
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 cigarette lighter fuse.
If the headlights or taillights, stoplights, courtesy lamp, and daytime running lights (D.R.L) 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.
Fuse switch
Always, put the fuse switch at the ON position.
If you move the switch to the OFF position, some items such as audio and digital clock must be reset and the transmitter (or smart key) may not work properly.
If the fuse switch is in OFF, a warning sign will illuminate on the dashboard.
CAUTION
- Put all switches in ON when driving.
- If the vehicle remains idle for over 1 month, put all switches in OFF to prevent the batteries from being discharged.
- Excluding long-term parking for over 1 month, the contact points of switches may wear out upon extensive use. Please refrain from excessive use of switches.
Engine compartment fuse replacement
- Turn the ignition switch 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 room fuse box. Upon removal, securely insert reserve fuse of equal quantity.
- 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 a professional workshop. Kia recommends to consult an authorised Kia dealer/service partner.
CAUTION
After checking the fuse panel in the engine compartment, securely install the fuse panel. If not, cover through the audible clicking sound. Electrical failures may occur from water contact.
Multi fuse
If the multi fuse is blown, it must be removed as follows
- Disconnect the negative battery cable.
- 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.
NOTICE
If the multi fuse is blown, consult a professional workshop. Kia recommends to consult an authorised Kia dealer/service partner.
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 picture above.
- Replace the fuse with a new one of the same rating.
- Reinstall in the reverse order of removal
NOTICE
The electronic system may not function correctly even when the engine room and internal fuse box’s individual fuses are not disconnected. In such 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, visit a professional workshop. Kia recommends visiting the nearest authorised Kia dealer/service partner.
CAUTION
Visually inspect the battery cap for secure closing. If the battery cap is not securely latched, the electrical system may be damaged to due influx of moisture into the system.
Fuse/relay panel description
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.
Driver’s side fuse panel (Sedan)
Driver’s side fuse panel (Wagon)
Instrument panel (Driver’s side fuse panel)
Fuse Name |
Symbol |
Fuse rating |
Circuit Protected |
MODULE 7 |
7MODULE |
10A |
Around View Monitor Unit, Front Air Ventilation Seat Control Module, Front Seat Warmer Control Module, Rear Seat Warmer Control Module |
MODULE 5 |
5MODULE |
10A |
A/C Control Module, Electro Chromic Mirror, Driver IMS Module, Head Lamp LH/RH, Auto Head Lamp Levelling 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 |
6 MODULE |
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 |
Transaxle Range Switch, Smart Key Control Module |
A/BAG |
|
15A |
SRS Control Module, Passenger Occupant Detection Sensor |
MODULE 3 |
3 MODULE |
10A |
BCM, Stop Lamp Switch, AFLS Unit, Keyboard, VESS Unit, A/V & Navigation Head Unit, Sport Mode Switch |
MODULE 4 |
4 MODULE |
10A |
Console Switch, Blind Spot Detection Radar LH/RH, Smart 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, Centre Personal Lamp |
Fuse Name |
Symbol |
Fuse rating |
Circuit Protected |
MDPS |
1 |
10A |
MDPS Unit (Column/Rack) |
IG1 |
IG1 |
25A |
PCB Block (Fuse – OPCU2/ELECTRICAL WATER PUMP/TCU2/ACTIVE HYDRAULIC BOOTER 3/HEV ECU2/ECU3) |
MODULE 9 |
9 MODULE |
10A |
Smart Key Control Module |
WASHER |
|
15A |
Multifunction Switch (Wiper Low & Washer Switch) |
MODULE 8 |
8 MODULE |
10A |
Driver/Passenger Door Module |
CLUSTER |
CLUSTER |
10A |
Instrument Cluster |
MULTI MEDIA |
MULTIMEDIA |
15A |
Audio, A/V & Navigation Head Unit, Keyboard |
HTD STRG |
|
15A |
BCM (Steering Wheel Heated) |
MODULE 1 |
1 MODULE |
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 |
2 MEMORY |
10A |
Siren Control Module, Ultrasonic Intrusion Protection Sensor |
SMART KEY |
SMART KEY |
15A |
Smart Key Control Module |
Fuse Name |
Symbol |
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 |
2 |
20A |
Sunroof Control Unit (Roller) |
BATTERY MANAGEMENT |
BATTERY MANAGEMENT |
20A |
BMS Control Module |
MEMORY 1 |
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 |
GATEWAY |
10A |
Gateway |
S/HEATER REAR |
25A |
Rear Seat Warmer Control Module |
|
SUNROOF 1 |
1 |
20A |
Sunroof Control Unit (Glass) |
S/HEATER FRONT |
25A |
Front Air Ventilation Seat Control Module, Front Seat Warmer Control Module |
|
ECS |
ECS |
15A |
Not Used |
MODULE 2 |
2 MODULE |
10A |
Audio, A/V & Navigation Head Unit, Keyboard, Wireless Charger, Around 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 |
Symbol |
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 |
AMP |
25A |
AMP |
BRAKE SWITCH |
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 |
POWER OUTLET |
20A |
Front Power Outlet #1, Front Cigarette Lighter & Power Outlet #2 |
Engine compartment fuse panel (Sedan)
Engine compartment fuse panel (Wagon)
Battery terminal cover
Engine room compartment fuse panel
Fuse Name |
Symbol |
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 |
2 ACTIVE HYDRAULIC BOOSTER |
40A |
Integrated Brake Actuation Unit |
|
BLOWER |
|
40A |
RLY. 4 (Blower Relay) |
|
POWER OUTLET1 |
1 POWER OUTLET |
40A |
RLY. 7 (Power Outlet Relay) |
|
IG2 |
IG2 |
30A |
PCB Block (IG2 Relay) |
Fuse Name |
Symbol |
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 |
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 |
1 ACTIVE HYDRAULIC BOOSTER |
40A |
Integrated Brake Actuation Unit |
|
IG1 |
IG1 |
40A |
PCB Block (IG1/ACC Relay) |
Fuse Name |
Symbol |
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, MEMORY2, MEMORY1, Fuse – MODULE1, DR LOCK, SMART KEY, BRAKE SWITCH) |
|
EPB 2 |
30A |
Electric Parking Brake Module |
||
OPCU 1 |
1 OPCU |
20A |
Electric Oil Pump Unit |
|
DEICER |
|
20A |
RLY. 10 (Deicer Relay) |
|
AMS |
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 |
Not used |
|
HEV ECU 1 |
1 HEV ECU |
10A |
HPCU |
|
OPCU2 |
2 |
10A |
Electric Oil Pump Unit |
Fuse Name |
Symbol |
Fuse rating |
Circuit Protected |
|
FUSE |
IG3 3 |
3 |
10A |
HYBRID OBC SIG |
IG3 4 |
|
20A |
IG3 3 RELAY |
|
SENSOR 1 |
|
15A |
Oxygen Sensor (Up/Down), E/R Junction Block (Cooling Fan Relay) |
|
IGN COIL |
IGN COIL |
20A |
Ignition Coil #1/#2/#3/#4 |
|
ECU 2 |
10A |
PCM |
||
TCU 1 |
|
10A |
PCM |
|
HEV ECU 2 |
2 HEV ECU |
10A |
HPCU, E/R Junction Block (Battery C/Fan Relay) |
|
ECU 3 |
10A |
PCM |
||
POWER OUT- LET2 |
2 POWER OUTLET |
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 |
BATTERY C/FAN |
15A |
E/R Junction Block (Battery C/Fan Relay) |
Symbol |
Relay Name |
Type |
COOLING FAN Relay |
MINI |
|
BLOWER Relay |
MICRO |
|
BATTERY C/FAN |
BATTERY C/FAN Relay |
MICRO |
POWER OUTLET |
POWER OUTLET Relay |
MICRO |
H/LAMP WASHER Rela |
MICRO |
|
|
DEICER Relay |
MICRO |
REAR HEATED Relay |
MINI |
|
1 |
PTC HEATER RELAY 1 |
MINI |
2 |
PTC HEATER RELAY 2 |
MINI |
IG 3 |
IG 3 RELAY |
MICRO |
How to replace the 2018 Kia Optima Phev Fuse
If you need to replace a fuse in your 2018 Kia Optima PHEV, follow these general steps.
Materials:
- New fuse of the correct amperage (refer to the owner’s manual for the correct rating).
- Fuse puller or needle-nose pliers.
Instructions:
-
Turn off the vehicle:
- Ensure the ignition is turned off, and the key is removed from the ignition.
-
Locate the fuse box:
- The fuse box is typically located in the engine compartment or under the dashboard on the driver’s side.
-
Remove the fuse:
- Use the fuse puller tool or needle-nose pliers to grasp the fuse. Apply gentle, even pressure, and pull the fuse straight out.
-
Inspect the fuse:
- Examine the fuse for any signs of damage, such as a broken filament or discolouration. If the fuse is blown, you will need to replace it.
-
Install the new fuse:
- Take the new fuse of the same amperage rating and push it firmly into the slot where the old fuse was removed.
-
Close the fuse box:
- Ensure that the new fuse is securely in place and that there are no loose wires or debris in the fuse box.
-
Test the component:
- Turn on the ignition and test the component associated with the fuse to ensure it is now functioning properly.
Tips:
- Always use a fuse with the correct amperage rating to prevent electrical issues or damage to the vehicle.
- If a fuse blows repeatedly, it may indicate an underlying electrical problem and professional assistance may be needed.
FAQs
The engine compartment of the 2018 Kia Optima PHEV is normally home to the fuse box.
Lift the cover and press the tab or release latch to open the fuse box cover.
The owner’s manual or the inside of the fuse box cover frequently have the fuse box diagram printed on them.
A blown fuse typically has visible damage to the filament or a broken metal strip. Examine them with a flashlight.
To remove and replace fuses, you usually just need a fuse puller or a pair of needle-nose pliers.
No, it isn’t advised. To avoid problems or damage to your electrical system, always replace a blown fuse with one that has the same amp rating.
The amp rating of each fuse will be indicated in the owner’s manual orfuse box diagram.
Electrical problems, a short circuit, or a malfunctioning part can cause blown fuses.
The order isn’t set in stone. Make sure the car is off before replacing the blown fuse with the proper one
To find the matching fuse, consult the fuse box diagram. If required, replace it.
In most cases, you can change fuses without unplugging the battery. Disconnecting the battery is safer if you’re working on large electrical components, though.
Should the fuse continue to blow, there might be a deeper electrical problem.
Spare fuses for certain cars are kept in the fuse box.
To ensure compatibility, it is advised to use the same brand and type of fuse as the original.
Useful Links
View Full PDF: 2018 Kia Optima Phev Owner’s Manual| Auto User Guide