Question: Where can I find a 2004 Kia Optima radio wiring diagram? What are the 2004 Kia Optima radio wiring harness color codes?
If you’re planning to upgrade the radio in your 2004 Kia Optima or troubleshoot issues with your car stereo, this guide is here to help!
Our comprehensive 2004 Kia Optima radio wiring diagram shows all the radio wire harness colors, speaker wire colors, and speaker sizes. Use this head unit pinout guide to help with your car stereo installation or to troubleshoot radio wiring issues in your 2004 Kia Optima.
In This Guide
2004 Kia Optima Car Stereo Wiring Diagram
This 2004 Kia Optima radio wiring chart shows you all the 2004 Kia Optima stereo wire color codes and their radio wire functions. This easy-to-follow guide can help you install a new car stereo or figure out problems with your stereo wiring harness and radio setup. If you don’t see the car radio wiring information you’re looking for, please feel free to ask your question at the bottom of this page.
| Car Stereo Wire Function | Wire Color Code |
|---|---|
| Battery Constant Power Wire (12v+) | Pink |
| Accessory Switched Power Wire (12v+) | Pink |
| Ground Wire | Black |
Use a Wiring Harness  and Dash Kit  for an Easy Install! |
|
| Illumination Wire | Red |
| Dimmer Wire | Black |
| Antenna Trigger Wire | Green/Black |
| Amplifier Turn-On Wire | N/A |
| Amplifier Mute Wire | N/A |
| Amplifier Location | Car amplifier is located on the right side of the trunk. |
2004 Kia Optima Speaker Wiring Guide
This 2004 Kia Optima speaker wiring guide provides all the speaker wire colors and speaker locations you need for an upgrade or replacement. Whether you are installing new speakers or troubleshooting your factory setup, this 2004 Kia Optima chart makes it easy to identify each wire and where it connects. If you don’t see the car speaker wiring info you need, feel free to ask your question at the bottom of the page — we are here to help!
| Car Stereo Wire Function | Wire Color Code |
|---|---|
| Dash Center Speaker Positive Wire (+) | N/A |
| Dash Center Speaker Negative Wire (-) | N/A |
| Front Left Tweeter Positive Wire (+) | N/A |
| Front Left Tweeter Negative Wire (-) | N/A |
| Front Right Tweeter Positive Wire (+) | N/A |
| Front Right Tweeter Negative Wire (-) | N/A |
| Front Left Speaker Positive Wire (+) | Brown |
| Front Left Speaker Negative Wire (-) | White |
| Front Right Speaker Positive Wire (+) | Orange |
| Front Right Speaker Negative Wire (-) | Green |
| Rear Left Tweeter Positive Wire (+) | N/A |
| Rear Left Tweeter Negative Wire (-) | N/A |
| Rear Right Tweeter Positive Wire (+) | N/A |
| Rear Right Tweeter Negative Wire (-) | N/A |
| Rear Left Speaker Positive Wire (+) | Black |
| Rear Left Speaker Negative Wire (-) | Yellow |
| Rear Right Speaker Positive Wire (+) | Blue |
| Rear Right Speaker Negative Wire (-) | Red |
| Subwoofer Positive Wire (+) | White |
| Subwoofer Negative Wire (-) | Brown |
2004 Kia Optima Speaker Sizes and Locations
This 2004 Kia Optima speaker guide includes speaker sizes, speaker locations, and helpful info on speaker upgrades. Use this chart to find out what size speakers fit your 2004 Kia Optima.
| Application | Speaker Size/Location |
|---|---|
| Dash Center Speaker Size | N/A |
| Dash Center Speaker Depth | N/A |
| Dash Center Speaker Location | N/A |
| Front Tweeter Size | 1″ Tweeters |
| Front Tweeter Depth | N/A |
| Front Tweeter Location | Front Doors |
| Front Speaker Size | 6.5″ Speakers |
| Front Speaker Depth | 4″ Depth |
| Front Speaker Location | Front Doors |
| Rear Tweeter Size | N/A |
| Rear Tweeter Depth | N/A |
| Rear Tweeter Location | N/A |
| Rear Speaker Size | 6.5″ Speakers |
| Rear Speaker Depth | 6″ Depth |
| Rear Speaker Location | Rear Deck |
| Subwoofer Size | N/A |
| Subwoofer Depth | N/A |
| Subwoofer Location | N/A |
Questions and Answers
If you have any questions about your 2004 Kia Optima radio installation, please don’t hesitate to post them at the bottom of this page. We’re committed to finding the answers you need, and members of the Modified Life community may also provide valuable insights into the car stereo information you’re looking for. Don’t hesitate to ask your car audio question; it could benefit others seeking the same answers!
Contribute
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8 thoughts on “2004 Kia Optima Radio Wire Harness Guide”
My mother-in-law has a 2004 Kia Optima and her factory stereo is not putting out any sound. A mechanic at the local shop said the “power amplifier” went bad and it’s an $800 part. He said the stereo itself is fine, but since the “power amplifier” is bad, the sound from the stereo head unit can’t be heard. Is there such a thing or can I just install an aftermarket stereo and solve the problem?
Greg, it is possible for a factory amplifier to go bad and yes it is expensive to replace because you can only get the amplifier from the dealer. If you don’t want to spend $800 on an amplifier, our advice is to call a couple of experienced car stereo installation shops in your area. Ask them if they can bypass the amp, it may be cheaper to have your car re-wired rather than spend $800 dollars. Hope this helps. Good luck.
We have the same problem and was told to check around with junk yards and car stereo installation shops to see if they could put in an amp. I did not check the junk yards, but have run into the same issues of everyone wanting an outrageous amount to get the amp. Can I use just any amp? Is there a certain size? Brand? The stereo works, as do the front speakers…was told the amp supplies to the rear speakers of which are not working. Thanks!
i have a 2004 kia optima lx i am hooking up 2 bazooka subs with amps but dont know where to wire them
Will, most late model vehicles do not have RCA outputs on the factory radio to feed an audio signal to your aftermarket amplifier. You would have to install a line out converter to supply an audio output. Here is the Line-Out Converter you need:
Scosche 2-Channel Speaker to RCA Line Out Converter
When splicing in the RCA Line Out Converter, tap your factory rear speaker wires to get a full range audio source. We suggest you invest in some solid wire taps that wont come loose. These wire tap connectors will allow you to tap into wires without cutting and installs in seconds by hand with no crimping or tools required. If you install a line out converter, your rear speakers will still work properly. If you’ve never installed car audio before, we advise you to take your car to an experienced mobile audio installer. Hope this helps. Good luck with your 2004 Kia Optima amplifier and subwoofer installation.
i own a 2004 kia optima. i wanna know if the stereo coded because its bring out no sound from speakers and the channels keep fluctuating without following programmed channel settings. someone please help me out. you are guys are doing a great job .i have learned a lot here. thanks.
I have the same problem i have a 2004 kia optima and no sound comes out of my speakers at all I bought a new stereo and tried installing it last night and still no sound could this be an amp also?
Ashley, first double check ALL your fuses and make sure ALL your fuses are good. You can do this by using an Automotive Fuse Tester and make sure all of your fuses are not blown. If all of your fuses are in working condition, your 2004 Kia Optima may have a factory amplifier that needs to be turned on by your after market radio. The car radio amplifier trigger wire has to be wired up to turn on your factory amp to output sound from your speakers. Double check that your 2004 Kia Optima amplifier turn on wire is connected. Hope this helps. Good luck with your 2004 Kia Optima radio installation.