Car Stereo Radio Wiring Diagram – 2003 Ford Focus

Whether your an expert installer or a novice enthusiast with a 2003 Ford Focus, an automotive wiring diagram can save yourself time and headaches. One of the most time consuming tasks with installing a car stereo, car radio, car speakers, car amplifier, car navigation or any mobile electronics is identifying the correct wires for a 2003 Ford Focus.

The Modified Life staff has put their heads together to create an invaluable resource containing car stereo wiring diagram, car wiring diagram and radio wiring diagram. Feel free to use any 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. 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 Ford Focus.

If you can’t find your car radio or stereo wire diagram on Modified Life, please feel free to post a car wiring diagram request at the bottom of this page and we’ll do our best to find you the information you need for your mobile installation.

2003 Ford Focus Car Stereo Radio Wiring Diagram

Radio Constant 12V+ Wire: Orange/Black (Thick Wire)
Radio Switched 12V+ Wire: Yellow/Green
Radio Ground Wire: Black/Yellow and Black/Green
Radio Illumination Wire: Orange/Black (Thin Wire)
Radio Dimmer Wire: N/A
Radio Antenna Trigger Wire: N/A
Radio Amp Trigger Wire: None
Front Speakers Size: N/A
Front Speakers Location: N/A
Left Front Speaker Wire (+): White/Black
Left Front Speaker Wire (-): Gray/Black
Right Front Speaker Wire (+): White/Red
Right Front Speaker Wire (-): Gray/Red
Rear Speakers Size: N/A
Rear Speakers Location: N/A
Left Rear Speaker Wire (+): White/Purple
Left Rear Speaker Wire (-): Gray/White
Right Rear Speaker Wire (+): White
Right Rear Speaker Wire (-): Gray

Make Your Ford Focus Car Stereo Installation Easy with these Products

9 Comments

  • Reply Louis March 19, 2009 at 6:32 am

    This web site is great. so helpful. Good stuff.

  • Reply ModifiedLife March 23, 2009 at 5:45 pm

    Louis, we are glad we could help you with your car stereo wiring diagram needs.

  • Reply Lojiko May 22, 2009 at 3:07 pm

    I couldn’t have installed my car audio without you. Thank you!

  • Reply ModifiedLife June 1, 2009 at 11:32 pm

    Lojiko, we are glad we could help you with your 2003 Ford Focus car radio wiring diagram needs.

  • Reply jaydon April 20, 2011 at 9:26 pm

    i dont see the subwoofer included in this diagram.

  • Reply ModifiedLife April 20, 2011 at 11:40 pm

    Jaydon, as much as we would like to help you, most of the car stereo wiring information listed on our website is provided by our visitors. We currently do not have any information on the 2003 Ford Focus subwoofer wiring but hopefully someone from our Modified Life community would be able to chime in and help you out.

  • Reply KritixChoyce July 23, 2011 at 2:36 pm

    I have my 2003 ford focus svt subwoofer amp and I need the pin out of the connector. Obviously not the one that connects to the speaker but rather the audio/power input side. Thanks!!

  • Reply ModifiedLife July 27, 2011 at 2:11 am

    Kritix, as much as we would like to help you, most of the car stereo wiring information listed on our website is provided by our visitors. We currently do not have any information on the 2003 Ford Focus SVT subwoofer wiring but hopefully someone from our knowledgeable Modified Life community would be able to chime in and assist you.

  • Reply Sycro21 November 25, 2011 at 7:27 pm

    I have a 2003 Ford Focus and have just finished installing it using this diagram but now i am having problems. When i turn on the radio and insert a cd it plays fine but as soon as i start moving the car the cd skips and the sound stops. This also happens when I use my ipod with the line out on the stereo. This never happened before in my 94 Saturn SL2. Did I possibly confuse the 12v wires or something? anyone?

  • Leave a Reply

    6 + 11 =