Splicing in a main engine wire harness at the firewall, need wiring diagram?

Tiny
JASONRUTH9
  • MEMBER
  • 2005 HYUNDAI ELANTRA
  • 2.0L
  • 4 CYL
  • 2WD
  • AUTOMATIC
  • 175,000 MILES
Car caught on fire. I've got another harness that matches the year model and started connecting the wires I can match. Now I've got all these solid color wires that I can't match. Need in depth diagram showing exactly where these wires go.
Saturday, December 31st, 2022 AT 8:20 AM

46 Replies

Tiny
KEN L
  • MASTER CERTIFIED MECHANIC
  • 51,648 POSTS
Yep, here are the engine wiring harness wiring diagrams and I have included a guide to help with the testing if you need it:

https://www.2carpros.com/articles/how-to-check-wiring

Check out the images (below). Please let us know if you need anything else to get the problem fixed.
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Saturday, December 31st, 2022 AT 5:52 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 110,114 POSTS
Hi,

I would be happy to help. There is one problem, I have no idea which schematic you need. Are the wires in question-related to power distribution, powertrain management, controller networking, or something different?

Let me know which you feel would help the most or if you want them all.

If you look below, I listed the circuits I have schematics for.

Let me know which you want, and I will get them to you.

Take care and Happy New Year,

Joe

See pics below.
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Saturday, December 31st, 2022 AT 6:12 PM
Tiny
JASONRUTH9
  • MEMBER
  • 58 POSTS
All of them. The thickest part of the harness where all the wires go through the grommet into the firewall into the passenger compartment behind the heater core. And goes to the interior fuse box.
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Saturday, December 31st, 2022 AT 9:07 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 110,114 POSTS
Hi,

Okay, here we go. I don't think I ever copied so many schematics. Don't be overwhelmed. Now, other than the first pic, which is for the power antenna, all others have a heading on the first page.

I had to cut each page in half to make them readable for you. But I did overlap them for you so you can follow from one to the next.

Let me know if this helps or if you have other questions.

Take care,

joe

See pics below.
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Sunday, January 1st, 2023 AT 8:14 PM
Tiny
JASONRUTH9
  • MEMBER
  • 58 POSTS
Thanks guys. Another question. Is it a safe bet to say that all of the ground wires will be solid black? Can I go ahead and wire the solid black wires and be okay?
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Sunday, January 1st, 2023 AT 9:48 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 110,114 POSTS
Hi,

Yes, the grounds are black. I don't know how, but I missed the ground circuits. I attached them below.

Let me know if this helps or if you have other questions.

Take care,

Joe

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+1
Monday, January 2nd, 2023 AT 12:25 AM
Tiny
JASONRUTH9
  • MEMBER
  • 58 POSTS
Thanks Joe.
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Monday, January 2nd, 2023 AT 5:35 AM
Tiny
JASONRUTH9
  • MEMBER
  • 58 POSTS
Can you tell me how the dash comes out? I've read the manual and can't find a video. I've taken all the nuts and bolts out and the cross bar that runs behind it is loose. Bit I am missing something because I cannot get it out. Everything is loose but will not come out.
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Sunday, January 8th, 2023 AT 2:59 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 110,114 POSTS
Hi,

I attached the directions from my manual below. There is a list of things that need to be removed and then a section that shows you where the nine bolts and one nut are located.

Take a look through the directions and let me know if you have questions.

Take care,

Joe

See pics below.
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Sunday, January 8th, 2023 AT 8:47 PM
Tiny
JASONRUTH9
  • MEMBER
  • 58 POSTS
The C nut? Does it run through the firewall? Then that's the one that is holding me up. I've got the same manual. But I've removed all the clips and nuts and it's the C I think is holding it in.
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Monday, January 9th, 2023 AT 4:26 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 110,114 POSTS
Hi,

You should be able to just remove the nut. The stud it's on will be attached to the firewall. Is the nut removed?

Joe
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Monday, January 9th, 2023 AT 2:05 PM
Tiny
JASONRUTH9
  • MEMBER
  • 58 POSTS
Pretty sure it is. I will take a picture when I get home and post it.
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Monday, January 9th, 2023 AT 2:09 PM
Tiny
JASONRUTH9
  • MEMBER
  • 58 POSTS
Is it possible that there is some kind of adhesive holding the crash pad in? I have removed every bolt and clip from the pad, and I've even unbolted the cross member from the frame, and it still won't come out. Like something is holding it in the middle somewhere! Somewhere along the windshield.
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Wednesday, January 11th, 2023 AT 8:31 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 110,114 POSTS
Hi,

To the best of my knowledge, there is nothing like that near the windshield. Make sure there isn't a wiring harness attached.

Let me know.

Joe
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Wednesday, January 11th, 2023 AT 1:53 PM
Tiny
JASONRUTH9
  • MEMBER
  • 58 POSTS
I will and I will attach a picture when I can. It's always dark by the time I get home from work.
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Wednesday, January 11th, 2023 AT 3:54 PM
Tiny
JASONRUTH9
  • MEMBER
  • 58 POSTS
Are there bolts under the defogger in the front by the wind shield?
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Monday, January 23rd, 2023 AT 5:04 AM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
  • 110,114 POSTS
Hi,

There are nine bolts and one nut that hold it in place. Were you able to locate all of them? As far as behind the defroster, there are guide pins. It's possible it is held up by one of the pins.

Let me know.

Joe
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Monday, January 23rd, 2023 AT 5:24 PM
Tiny
JASONRUTH9
  • MEMBER
  • 58 POSTS
I finally got the crashpad out. I wound up just removing the entire wire harness from the engine to the interior. I went to the pull a part and got the entire harness from another Elantra and I am in the process of wiring it in. Just seemed easier than the route I was going. The car will run again. There's been a lot of nay sayers that I'm going to prove wrong. Won't be too long and she'll drive again.
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Friday, April 21st, 2023 AT 1:46 PM
Tiny
JACOBANDNICKOLAS
  • MECHANIC
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Hi,

Thank you for the update. I like your positivity, and it will run again. Let me know how things turn out. I'm interested in knowing.

Also, let me know if I can help in any way.

Take care,

Joe
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Friday, April 21st, 2023 AT 10:23 PM
Tiny
JASONRUTH9
  • MEMBER
  • 58 POSTS
I do have a question. Same car but different problem. After the fire. A few months passed. Car hasn't run so motor was cold. We had a hard freeze and the next morning I went out to work on the car and I saw a puddle of oil under the engine that wasn't there before. Wanted to know your thoughts on it. Thanks again.
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Saturday, April 22nd, 2023 AT 8:03 AM

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