2003 Chevrolet Impala Car Stereo Radio Wiring Diagram

Whether your an expert Chevrolet electronics installer or a novice Chevrolet enthusiast with a 2003 Chevrolet Impala, a car stereo wiring diagram can save yourself a lot of time. One of the most time consuming tasks with installing an after market car stereo, car radio, car speakers, car amplifier, car navigation or any car electronics is identifying the correct color wires for a 2003 Chevrolet Impala.

The Modified Life staff has taken all its Chevrolet car radio wiring diagrams, Chevrolet car stereo wiring diagrams, Chevrolet car radio wiring schematics, Chevrolet car wiring diagrams and cataloged them online. Feel free to use any Chevrolet car stereo wiring diagram that is listed on Modified Life but keep in mind that all information here is provided “as is” without any warranty of any kind and most of the diagrams listed on our enthusiast website are submitted by the Modified Life community. Use of the wiring information is at your own risk. Always verify all wires, wire colors and diagrams before applying any information found here to your 2003 Chevrolet Impala.

If you can’t find your car stereo wiring diagram or car radio wiring diagram on Modified Life, please feel free to post a car wiring diagram request (Car Stereo Wiring Diagram Request Page) and we’ll do our best to find you the information you need for your mobile installation.

If you would like to help the Modified Life community by adding a car stereo wiring diagram or car radio wiring diagram to our resource, please feel free to post any additional information about the 2003 Chevrolet Impala on this page.

2003 Chevrolet Impala Car Stereo Radio Wiring Diagram

Car Radio Constant 12v+ Wire: Orange
Car Radio Switched 12v+ Wire: The radio harness does not provide a switched power source. Run a wire to the fusebox for switched power.
Car Radio Ground Wire: Black
Car Radio Illumination Wire: Gray
Car Stereo Dimmer Wire: N/A
Car Stereo Antenna Trigger: White
Car Stereo Amp Trigger Wire: N/A
Car Stereo Amplifier Location: N/A
Front Speakers Size: N/A
Front Speakers Location: N/A
Left Front Speaker Positive Wire (+): Tan
Left Front Speaker Negative Wire (-): Gray
Right Front Speaker Positive Wire (+): Light Green
Right Front Speaker Negative Wire (-): Dark Green
Rear Speakers Size: N/A
Rear Speakers Location: N/A
Left Rear Speaker Positive Wire (+): Brown
Left Rear Speaker Negative Wire (-): Yellow
Right Rear Speaker Positive Wire (+): Dark Blue
Right Rear Speaker Negative Wire (-): Light Blue

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20 Comments

  • Reply Sam May 11, 2008 at 11:52 am

    I can’t find the yellow car radio switched wire in my 2003 chevy impala. Is the switch wire another color?

  • Reply ModifiedLife May 12, 2008 at 1:13 am

    Sam, run a primary wire from the back of your radio to the orange wire at the ignition switch harness for your switched 12v wire. Hope this helps.

  • Reply Brian October 14, 2008 at 4:30 pm

    does anybody know where the amp ignition wire is…its not right on the harness i have…if someone could tell me the color of it that would be great and solve all my problems

  • Reply James Phelps June 15, 2009 at 9:52 pm

    The radio does not have a switched wire. It turns on through a databus singal from the computer, hence your delayed on/off functions. It operates as an extension of the computer. Under the Passenger-side dash there is a Auxiliary power drop hidden in the dash which can be accessed by taking the bottom panel off. This drop has a Ground, Ignition(Switched), and a 15-amp constant line.

  • Reply ModifiedLife June 25, 2009 at 1:04 am

    James, thanks for the car stereo installation contribution!

  • Reply Joe White February 25, 2010 at 6:39 am

    The wiring harness from the stock radio has 2 orange wires and one pink one. What orange one do i need to use for the constant power and what should i do with the pink wire? There is also a seperate plug on the back of the stock radio that has two wires one green n black and black w white, What are these for?

  • Reply Dan April 11, 2010 at 4:12 pm

    How do I bypass the factory amp? I installed new eclipse speakers for the front and they said I have to bypass the amp in order to get full sound. how abouts do I do that?

  • Reply Cam May 21, 2010 at 1:50 pm

    i have no sound but the power turns the stereo on but nothing comesout of speakers. does it have something to do with the plug that has two wires that don’t go to anything anymore?

  • Reply ModifiedLife June 3, 2010 at 4:55 pm

    Cam, your 2003 Chevrolet Impala may have a factory amplifier that needs to be turned on by your after market radio. The car stereo amplifier trigger wire has to be wired up to turn on your factory amplifier. Unfortunately, we do not have this information but maybe someone from the Modified Life community can post that information here. Hope this helps. Good luck.

  • Reply Curt November 13, 2010 at 12:49 pm

    03 Impala has no sound – head unit comes on and seems to be functioning properly. I know amp in trunk is good because i tried it in another 03 Impala. How do I go about diagnosing this problem further? Any help is appreciated

  • Reply ModifiedLife November 17, 2010 at 12:23 am

    Curt, 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 making sure all of your fuses are not blown. If all of your fuses are good, your 2003 Chevrolet Impala stereo or factory amplifier (if equipped) may be faulty. We suggest you take your car to an experienced audio installer and have them troubleshoot your problem. Hope this helps. Good luck with your 2003 Chevrolet Impala radio troubleshooting.

  • Reply sicopata February 24, 2011 at 1:43 pm

    factory amp turn on wire is white wire on factory harness cut it and plug it to blue and white wire from radio unit

  • Reply ModifiedLife March 1, 2011 at 3:36 am

    Sicopata, thanks for the 2003 Chevrolet Impala radio amplifier turn-on wiring information contribution!

  • Reply johneric January 1, 2012 at 11:11 pm

    2003 chevrolet impala. just installed aftermarket radio. got no sound. does the 2 wires left over have anything to do with it?

  • Reply tray bobo January 2, 2012 at 12:11 pm

    where does the pink wire go??? anyone know?

  • Reply ModifiedLife January 3, 2012 at 7:48 pm

    Johneric, 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 making sure all of your fuses are not blown. If all of your fuses are good, your 2003 Chevrolet Impala may have a factory amp 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 amplifier to output sound from your speakers. Double check that your 2003 Chevrolet Impala amp turn on wire is connected. Hope this helps. Good luck with your 2003 Chevrolet Impala stereo installation.

  • Reply delfin April 15, 2012 at 4:07 pm

    Yes quick question is it possible to have the volume button on the 2003 Chevrolet Impala steering wheel work with a non factory radio I have a pioneer 3400

  • Reply ModifiedLife April 24, 2012 at 12:08 am

    Delfin, if you’re installing an aftermarket radio into your 2003 Chevrolet Impala and want to retain your steering wheel controls it is possible but it depends on the manufacturer of your aftermarket radio:

    Steering Wheel Control Adapter for Alpine Radio
    Steering Wheel Control Adapter for Blaupunkt Radio
    Steering Wheel Control Adapter for Clarion Radio
    Steering Wheel Control Adapter for Eclipse Radio
    Steering Wheel Control Adapter for JVC Radio
    Steering Wheel Control Adapter for Kenwood Radio
    Steering Wheel Control Adapter for Pioneer Radio
    Steering Wheel Control Adapter for Sony Radio
    Steering Wheel Control Adapter for Valor Radio

    If you have 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 2003 Chevrolet Impala stereo installation.

  • Reply Johan June 13, 2012 at 7:02 pm

    Hi i a 2003 chevrolet impala I did the installation myself. I also have headrest tv’s. My question is can I use the positive and ground cables that are underneath the glove compartment to install my headrest so that I don’t have to use the positive and ground from the stereo wiring? And I would also like to know if there’s a way to have like a switch for the stereo I don’t like that it can b turned on even without the key. Thanks

  • Reply ModifiedLife June 26, 2012 at 9:10 pm

    Johan, we advise you to run a primary wire to your battery as a power source and ground your negative wire to the chassis (look below):

    1. Find some bare metal on your vehicle. Make sure this bare metal touches the chassis (frame) of the vehicle.

    Bare Metal for Chassis Grounding

    2. Connect a ring terminal to the ground wire coming off your aftermarket amplifier.

    Ground Wire with Ring Terminal

    3. Use a self tapping screw to attach the black wire with ring terminal to the bare metal. Just make sure the metal you are screwing into does not have any wires or vital automotive components behind it.

    Self Tapping Screw

    Hope this helps. Good luck with your 2003 Chevrolet Impala headrest TV installation.

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