Replaced blown fuse, several issues followed?

2004 HYUNDAI ELANTRA
52,000 MILES • 2WD • AUTOMATIC
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Several weeks ago, the cigarette lighter fuse blew. I replaced it and confirmed the cigarette lighter now works. After replacing that fuse, several other issues followed.

The following no longer work: radio, clock, audio beeping when seatbelt is not on, locking/unlocking via key fob (arming car), interior overhead lights, and the OBD2 port. Additionally, when I turn the car on, the speedometer and tachometer abruptly move towards 12 o'clock, oscillate around it for a few seconds, and then return to their starting positions.

I have tested almost every fuse in both the instrument panel and under the hood -- I have not yet tested the larger fuses (relays?) under the hood. I can pull them out and test continuity but am not sure if they are just fuses or are in fact relays. They are categorized as "fuses" in the user manual.

I performed both a visual check and used a multimeter to ensure continuity. I replaced my car battery (it was close to being due).

I would appreciate any guidance regarding the large fuses/relays under the hood and any other suggestions for what to test. Thank you.
Jan 7, 2023 at 1:43 PM
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JACOBANDNICKOLAS
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Hi,

If you take a pic of what you are seeing, upload it for me. I will be able to identify them for you.

Keep in mind, when you check a fuse, it is just as important to confirm there is power to them.

Here is a link that explains how that is done:

https://www.2carpros.com/articles/how-to-check-a-car-fuse

Let me know.

Joe
Jan 8, 2023 at 9:20 PM
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Hi Joe,

Thanks for your response. I just purchased a test light and will test the fuses tomorrow. What are you asking for a picture of?

Thanks
Jan 11, 2023 at 12:02 PM
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JACOBANDNICKOLAS
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Hi,

You mentioned not being sure if things were relays or fuses. If you need help identifying them, take a pic of what you are working with and upload them for me to see.

Let me know.

Joe
Jan 11, 2023 at 1:50 PM
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Hi Joe,

I've attached an image of the fuse box under the hood. I know the small ones are fuses. Are the large blocks (black, blue, yellow, and gray) relays?

I tested the fuses related to functions not working for power using a test light and found that the 15A ROOM LP fuse was not receiving power. I swapped it out for a new fuse, but it still received no power.
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Jan 12, 2023 at 10:46 AM
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JACOBANDNICKOLAS
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Hi,

Okay, I had to trace the wiring schematics to locate the power supplies. Ugh LOL I assume the fuse you indicated having no power is in the passenger compartment.

Also, you are correct about the relays.

Now, to get power to the fuse you mentioned, three other fuses or fusible links need to be good. So, I need you to follow this path when checking for power so we can determine where it is lost.

In the passenger compartment fuse box, check fuse 16 for power (pic 1). It allows power to reach the fuse you mentioned.

If fuse 16 doesn't have power, there is a 50-amp fuse in the under-hood fuse box that needs to be checked. (Pic 2 and 3)

If there is no power, then it goes straight back to the battery, so we will need to do things differently at that point (see pic 3).

Remember, when you check for power, it needs to be present on both sides of the fuse when the fuse is connected.

Let me know what you find.

Joe

See pics below. Pics 4 and 5 show the fuses I mentioned.

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Jan 12, 2023 at 7:59 PM
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Hi Joe,

Sorry for the delay, I was traveling. Fuse 16 does indeed have power.
Jan 20, 2023 at 6:41 AM
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JACOBANDNICKOLAS
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Hi,

No problem whatsoever. If you still have no power to fuse 15, check fuse 13 in the same box. If it has power, then we have an open circuit between the supply and fuse 15. To confirm there isn't an issue before this point, check fuses 4 and 14 for power. They too should have it.

Also, check fuse 25 under the dash. Interestingly, the standard for a power supply on the DLC is to pin 16. On this vehicle, it is pin 9. The power to it is from fuse 25. See pic below.

Let me know.

Take care,

Joe

See pic below.
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Jan 20, 2023 at 8:32 PM
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Hi Joe,

I think there was a misunderstanding above when I said the 15A ROOM LP fuse is receiving no power. That's what the fuse is called in my car handbook. According to your fuse diagram, that is fuse 25.
Jan 21, 2023 at 4:14 AM
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Hi Joe,

I found the issue. Not too surprisingly, I was the cause. I was looking at the schematics and saw that fuse 25 connects to the rest of the bus via the power connector. I looked into that to see if I needed a replacement. Found a whole bunch of pictures of the entire passenger fuse box. Sure, enough the power connector was in the wrong orientation. I must have removed it thinking it was the fuse puller when I fixed the original blown fuse and put it back in the wrong orientation. It's all fixed now. Hopefully, this saga helps someone else out in the future. Thanks for all your help!
Jan 21, 2023 at 12:14 PM
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JACOBANDNICKOLAS
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Hi,

Thanks for the update. I'm glad to know you found the issue. And trust me, it happens to all of us. LOL

Regardless, your fix will likely help others in the future, so thanks for letting us know. Take care and feel free to come back anytime in the future.

Jan 21, 2023 at 11:25 PM