Question: Where can I find a 1998 GMC Sonoma radio wiring diagram? What are the 1998 GMC Sonoma radio wiring harness color codes?
If you’re planning to upgrade the radio in your 1998 GMC Sonoma or troubleshoot issues with your car stereo, this guide is here to help!
Our comprehensive 1998 GMC Sonoma 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 1998 GMC Sonoma.
In This Guide
1998 GMC Sonoma Car Stereo Wiring Diagram
This 1998 GMC Sonoma radio wiring chart shows you all the 1998 GMC Sonoma 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+) | Orange |
| Accessory Switched Power Wire (12v+) | Yellow |
| Ground Wire | Black |
Use a Wiring Harness  and Dash Kit  for an Easy Install! |
|
| Illumination Wire | Gray |
| Dimmer Wire | Brown |
| Antenna Trigger Wire | N/A |
| Amplifier Turn-On Wire | N/A |
| Amplifier Mute Wire | N/A |
| Amplifier Location | N/A |
1998 GMC Sonoma Speaker Wiring Guide
This 1998 GMC Sonoma 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 1998 GMC Sonoma 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 (+) | Tan |
| Front Left Speaker Negative Wire (-) | Gray |
| Front Right Speaker Positive Wire (+) | Light Green |
| Front Right Speaker Negative Wire (-) | Dark 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 (+) | Brown |
| Rear Left Speaker Negative Wire (-) | Yellow |
| Rear Right Speaker Positive Wire (+) | Dark Blue |
| Rear Right Speaker Negative Wire (-) | Light Blue |
| Left Subwoofer Positive Wire (+) | N/A |
| Left Subwoofer Negative Wire (-) | N/A |
| Right Subwoofer Positive Wire (+) | N/A |
| Right Subwoofer Negative Wire (-) | N/A |
1998 GMC Sonoma Speaker Sizes and Locations
This 1998 GMC Sonoma speaker guide includes speaker sizes, speaker locations, and helpful info on speaker upgrades. Use this chart to find out what size speakers fit your 1998 GMC Sonoma.
| 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 | N/A |
| Front Tweeter Depth | N/A |
| Front Tweeter Location | N/A |
| Front Speaker Size | 6.5″ Speakers |
| Front Speaker Depth (2-Door) | 4″ Depth |
| Front Speaker Depth (4-Door) | 3″ Depth |
| Front Speaker Depth (Extended Cab) | 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 | 4″ x 6″ Speakers |
| Rear Speaker Size (Extended Cab) | 4″ x 10″ Speakers |
| Rear Speaker Depth (2-Door) | 3″ Depth |
| Rear Speaker Depth (Extended Cab) | 3″ Depth |
| Rear Speaker Location | N/A |
| Subwoofer Size | N/A |
| Subwoofer Depth | N/A |
| Subwoofer Location | N/A |
Questions and Answers
If you have any questions about your 1998 GMC Sonoma 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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3 thoughts on “1998 GMC Sonoma Car Radio Wiring Guide”
I have a 1998 GMC Sonoma with the in dash CD/AM/FM player and the separate cassette deck down below in the console. I am currently using the cassette to hook up my MP3 player through a Sony cassette tape with cable. It’s a real pain, especially in cold weather when the tape won’t stay in. Anyway, is there a way to replace the separate cassette player in the console with a MP3 Aux. port. It seems to me the cassette unit has wiring or a connecting cable that could be used for a direct MP3 connection to the main unit in the dash?
Please help me? Thanks, Greg in PA.
Greg, you will need a bluetooth transmitter. A bluetooth transmitter will allow you to connect any bluetooth device to your factory radio. This is the easiest and most cost effective way to add an audio input into your factory stereo. Here is the bluetooth transmitter you will need:
Aux Input Adapter for 1998 GMC Sonoma
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 1998 GMC Sonoma bluetooth transmitter installation.
I would prefer to hard wire the Aux. Input port. Does my unit have an unused AUX port on the back of it? It is a single CD player, is there an Aux port on the back of this unit? Let me know. Thanks, Greg in PA