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Kia Optima Electrical Fuse Replacement Guide
How to check or change a blown electrical fuse or relay in a fourth generation 2016 to 2020 Kia Optima sedan.

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Paul B. Michaels
Author & Photographer
Auto Mechanic Since 1989

2019 Optima Theta 2.4L
Engine Bay Fuse Box
Push In Rear Release Tab
This automotive maintenance tutorial was specifically written to assist owners of the 4th generation (2016, 2017, 2018, 2019 and 2020 model years) Kia Optima sedan in checking or changing a blown electrical fuse or a faulty relay located in either the engine bay fuse box or the interior passenger compartment electrical panel.

Owners of other Kia, Hyundai or Genesis vehicles such as the Niro, Sportage, Sedona, Telluride, Sorento, Rio, Forte, Soul, K900, Cadenza, K5, Stinger, Tucson, Santa Fe, Kona, Palisade, Elantra, Sonata, Accent, Veloster, Ioniq, Nexo, Venue, G70, G80 and G90 may also find these DIY instructions to be helpful.

This 2019 Kia Optima LX FE was equipped with the newest style of Micro2 electrical fuses which are available at most auto parts store, possibly at Walmart and online at Amazon.

Earlier model years might be equipped instead with low profile mini blade fuses.

To see a picture of a low profile mini blade fuse, view my 2011-2015 Kia Optima Electrical Fuse Replacement Guide.

Please check your old fuses to verify the type of your fuse your car has before buying new ones.

The first two steps are to open the hood and then move to the right (driver) side of the engine bay.

The rectangular shaped black plastic main fuse and relay box is situated behind the driver side headlight assembly and to the right of the 12V automotive battery and the engine air filter housing.


Push In Front Release Tab
Pull Off Fuse Box Cover
Fuse Location Diagram
Push in the black plastic release tab on the rear edge of the fuse box cover.

Then push in the black plastic release tab on the front edge of the cover.

Once both retaining clips have been released, you can lift the cover of the top of the fuse box.

Turn over the cover to view the fuse location diagram.

There is also another fuse and relay location diagram in the owner's manual.

Engine Bay Electrical Panel
White Plastic Fuse Puller
Lower Left Dashboard
There should be a white plastic fuse puller tool located at the right rear area of the engine bay electrical panel.

To access the interior passenger compartment electrical panel, move to the bottom left of the dashboard near the driver's door.

The rectangular shaped access cover is situated in front of where the driver's left knee would reside while driving on the left side of the steering wheel.

The cover has the words "FUSE OBD" printed on it.

Pull Out Access Cover
Fuse Location Diagram
Interior Fuse Panel
Insert your fingers into the opening near the bottom of the access cover.

Gently pull the bottom edge of the cover out of the dashboard.

Turn over the cover to view the fuse location diagram.

Place Jaws Over Old Fuse
Pull Out Old Fuse
Hold Up To Light Bulb
Pinch the end of the tool to open the jaws.

Place the jaws over the old fuse that you'd like to check or change.

Pull the old fuse straight out of the socket.

Remove the fuse from the jaws of the tool.

To check the condition of the old fuse, hold it up to a light bulb.

If the thin metal strip or "band" in the translucent plastic center of the old fuse appears burnt or broken, the fuse is most likely "blown" and should be replaced.

If the thin metal bar in the middle of the old fuse appears to be intact, the old fuse is probably still in good working condition.

Since new fuses are so inexpensive, it should still be replaced as part of your electrical problem troubleshooting process.

Push a new Micro2 fuse of the same amperage rating (e.g. 5A, 10A, 15A, 20A, 25 amps) straight into the socket.

If your Optima is an earlier 2016 or 2017 model year, it might be equipped with low profile mini blade fuses.

New Micro2 Fuse
Push New Fuse In Socket
Replace Fuse Puller Tool

If you would like to add a hard wired 12V power source for an automotive accessory such as a digital gauge, cell phone charger, dash cam, back-up camera, radar detector or an LED lighted Uber / Lyft sign, install an "Add-A-Circuit" fuse tap adapter (also known as a piggy back fuse holder).

Use a digital multimeter to find either a "switched" or "hot / live" circuit depending on your needs. A "switched" circuit will be off when the ignition is in the "Off" position and only supply 12 volt power when the ignition is in the "On" position. A constant hot / live circuit will always supply 12V power even when the car's ignition is switched off. (Be careful of draining the 12V car battery if you choose a hot / live circuit that is always on.)

If you suspect that a faulty relay is the cause of your problem, the easiest way to check is to simply replace the relay with a new one of the same amperage rating.

You could also test the old relay with a digital multimeter tool.

Replace the white plastic fuse puller tool into its holder at the right rear corner of the engine bay electrical block.

Push On Fuse Box Cover
Re-Insert Tabs Top Edge
Pop In Bottom Edge
Lower the cover back into place over the engine bay electrical panel.

Push on the cover to secure the two retaining clips.

Test the electrical component that you were having issues with such as the stereo, horn, headlights, tail lights, power driver seat, A/C system, power windows, tail lights, power door locks, etc.

If you are still having the same problem, there may be a shorted out wire or the electrical component itself needs to be replaced.

Be sure to write down the fuse change in your vehicle's service records.

Please check out all of my 2016-2020 Kia Optima DIY Repair & Maintenance Guides.

If you found this guide to be helpful, please consider making a small donation by clicking on the "Donate" button located to the right of this paragraph. Thank you!
(Note: I am not a registered charity. Donations are not tax deductible.)


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