Updated: 04/15/2024 • Published: 07/01/2008
Our comprehensive 2003 GMC Sierra 1500 radio wiring diagram shows you all the radio wire harness colors, car speaker wiring colors and car speaker sizes. Use our 2003 GMC Sierra 1500 head unit pin-out guide to help you with your car radio troubleshooting and installation needs.
In This Guide
2003 GMC Sierra 1500 Radio Wiring Diagram
This 2003 GMC Sierra 1500 radio wiring chart shows you all the 2003 GMC Sierra 1500 radio wire colors and their functions. Utilize this guide to help you with a car radio install or help with a car radio troubleshoot. 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.
Application | Radio Wire Color |
---|---|
Battery Constant Power Wire (12v+) | Orange |
Accessory Switched Power Wire (12v+) | The radio harness does not provide a switched power source. Run a wire to the fuse box or ignition switch harness for switched power. |
Ground Wire | Black/White |
Use a Wiring Harness |
|
Illumination Wire | Brown |
Dimmer Wire | Gray |
Antenna Trigger Wire | N/A |
Amplifier Turn-On Wire | N/A |
Amplifier Mute Wire | N/A |
Amplifier Location | N/A |
Use an Amp Wiring Harness |
2003 GMC Sierra 1500 Speaker Wiring Guide
This 2003 GMC Sierra 1500 speaker wiring chart shows you every speaker wire color and the speaker wire location. Use this 2003 GMC Sierra 1500 speaker wiring guide to help you with a speaker replacement or speaker upgrade. If the car speaker wiring information you’re searching for is not listed, please don’t hesitate to ask for it at the bottom of this page.
Application | Speaker Wire Color |
---|---|
Dash Center Speaker Positive Wire (+) | N/A |
Dash Center Speaker Negative Wire (-) | N/A |
Upgrade your Center Speakers for awesome sound! | |
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 |
Upgrade your Tweeters for cleaner audio highs! | |
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 |
Use a Speaker Wire Harness |
|
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 |
Upgrade your Tweeters for cleaner audio highs! | |
Rear Left Speaker Positive Wire (+) | White/Green |
Rear Left Speaker Negative Wire (-) | Gray/White |
Rear Right Speaker Positive Wire (+) | White |
Rear Right Speaker Negative Wire (-) | Gray |
Upgrade your Subwoofer for deeper and cleaner bass! | |
Left Subwoofer Positive Wire (+) | N/A |
Left Subwoofer Negative Wire (-) | N/A |
Right Subwoofer Positive Wire (+) | N/A |
Right Subwoofer Negative Wire (-) | N/A |
2003 GMC Sierra 1500 Speaker Sizes and Location
This 2003 GMC Sierra 1500 speaker size chart shows your speaker measurements and speaker locations. Use this chart to see what speaker fits in your 2003 GMC Sierra 1500.
Application | Speaker Size and Location |
---|---|
Dash Center Speaker Size | N/A |
Dash Center Speaker Depth | N/A |
Dash Center Speaker Location | N/A |
Upgrade your Center Speakers for awesome sound! | |
Front Tweeter Size | N/A |
Front Tweeter Depth | N/A |
Front Tweeter Location | N/A |
Upgrade your Tweeters for cleaner audio highs! | |
Front Speaker Size | 6.5″ Speakers |
Front Speaker Depth | 3.25″ Depth |
Front Speaker Location | Front Doors |
Use a Speaker Wire Harness |
|
Rear Tweeter Size | N/A |
Rear Tweeter Depth | N/A |
Rear Tweeter Location | N/A |
Use a Speaker Wire Harness |
|
Rear Speaker Size | 6.5″ Speakers |
Rear Speaker Depth | 3.3″ Depth |
Rear Speaker Location | N/A |
Upgrade your Subwoofer for deeper and cleaner bass! | |
Subwoofer Size | N/A |
Subwoofer Depth | N/A |
Subwoofer Location | N/A |
Questions and Answers
If you have any questions about your 2003 GMC Sierra 1500 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!
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5 thoughts on “2003 GMC Sierra 1500 Radio Wiring Guide”
There is another thin orange wire on my harness, what is it for?
I am having the same issue. I tested the front leads from the stereo by hooking them to the rear speakers and they work, so the problem is not my stereo and I checked every fuze and all were good.
i have a 2003 gmc sierra c1500 truck and my front speakers are not working. once or twice i heard them on but only temporarily. rear are working fine! any sugestions on how to fix this? thanks doug
Tim, we’re glad we could help you with your car stereo wiring diagram needs.
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