Fuse Diagrams: 2018 Kia Optima Phev Fuses and Relay Guide

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

1. Turn the ignition switch and all other switches off.
2. Open the fuse panel cover.

If the switch is located in the “OFF”, caution will be displayed in the cluster.

3. Pull the suspected fuse straight out. Use the removal tool provided in the main fuse box in the engine compartment.
4. 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).

5. 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

1. Turn the ignition switch and all other switches off.
2. 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.
3. 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.
4. 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

1. Disconnect the negative battery cable.
2. Remove the nuts shown in the picture above.
3. Replace the fuse with a new one of the same rating.
4. 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

1. Turn off the engine.
2. Disconnect the negative battery cable.
3. Remove the nuts shown in the picture above.
4. Replace the fuse with a new one of the same rating.
5. 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 MEMORY	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 OPCU	10A	Electric Oil Pump Unit

Fuse Name		Symbol	Fuse rating	Circuit Protected
FUSE	IG3 3	3 IG3	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	PTC HEATER RELAY 1	MINI
2 PTC HEATER	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:

1. New fuse of the correct amperage (refer to the owner’s manual for the correct rating).
2. Fuse puller or needle-nose pliers.

Instructions:

1. Turn off the vehicle:

   • Ensure the ignition is turned off, and the key is removed from the ignition.

2. Locate the fuse box:

   • The fuse box is typically located in the engine compartment or under the dashboard on the driver’s side. 

3. 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.

4. 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.

5. 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.

6. 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.

7. 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

Useful Links

View Full PDF: 2018 Kia Optima Phev Owner’s Manual| Auto User Guide

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