Question about 2004 Mazda 3

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I NEED FREE FACTORY RADIO WIRING DIAGRAM

I NEED RADIO HARNESS WIRING DIAGRAM FOR MAZDA 3

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  • Anonymous May 15, 2009

    2004 Mazda 3 HB 2.3 L engine. What the wire for line out in the radio. To add an amplifier for the subwoofer.

  • yadayada
    yadayada May 11, 2010

    Radio Constant 12V+ Wire: Blue/Red
    Radio Ignition Switched 12V+ Wire: Blue/Black
    Radio Ground Wire: Black
    Radio Illumination Dimmer Wire: Red/Black
    Radio Antenna Trigger Wire: Gray/Black
    Radio Amplifier Trigger Wire: Light Green/Black
    Front Speakers Size: N/A
    Front Speakers Location: N/A
    Left Front Speaker Wire (+): Yellow/Green
    Left Front Speaker Wire (-): Green
    Right Front Speaker Wire (+): Yellow/Red
    Right Front Speaker Wire (-): Yellow/Black
    Rear Speakers Size: N/A
    Rear Speakers Location: N/A
    Left Rear Speaker Wire (+): Blue/Yellow
    Left Rear Speaker Wire (-): Yellow
    Right Rear Speaker Wire (+): Green/Black

  • yadayada
    yadayada May 11, 2010

    what year is the car.

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I have a 1991 honda accord radio problem can you HELPme

Posted on Jun 21, 2009

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Can I wire my new radio to the factory radio harness if I cut it


You would need the wiring schematics to both radios to ensure you are wiring the right leads from one radio to the other...or else you could end up damaging the receiver and/or the amp.

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I'm looking for a factory wiring diagram for my 1999 vw passat.


Hi Chad,

If you cut the car's radio connectors off the wiring harness, you'll void the warranty of the car (or worse). Trying to splice or "tap" the wires will get confusing even if you don't connect the blue wire with the white stripe to the white wire with the blue stripe.

Do yourself a huge favor and purchase a wiring harness adapter for your 199 Passat instead. Crutchfield sells one for your car for $10. Likewise, most electronics stores that deal witrh mobile installs have them too - check out Best Buy, Circuit City, Fry's and even your local independent radio shops.

You wire the new radio's harness to the harness adapter for the car in the comfort of your home (the light is better and you don't have to contort yourself to do the work). When complete, bring it out to the car and plug one end into the car, and the other into the radio. Insert the antenna plug and you're done wiring!

If you want a wiring diagram, those usually aren't available online for free. You need to spend a few dollars for a Chilton's Auto Repair Manual or similar at an autoparts store. You may find registering at a site for Passat Enthusiasts will be beneficial.. all the folks there have Passats and discuss everything from tire sizes and rims to transmission rebuilding. One such site is the "Forum" section of Passat World.

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Radio wire diagram for 2011 Mazda 3


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Car Radio Battery Constant 12v+ Wire: Brown
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CLICK HERE for your vehicles full service manual. If you are cutting wires.
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Switched 12V+ Gray
Ground Brown (or your own wire to a metal grounding point)
Illumination Green
Antenna Trigger Black/Red

Front Speakers 4" Dash
Left Front (+) Pink
Left Front (-) Purple
Right Front (+) Green
Right Front (-) Blue

Rear Speakers 5 1/4" Rear Deck
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Left Rear (-) Yellow
Right Rear (+) Red
Right Rear (-) White

I a '83 camry, there are 2 seperate plugs that go into a factory radio.
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Sounds as if you are missing part of the harness for the rear speakers (or it is shoved in the back of the dash unused by the previous install). If there is not an un-cut plug in the dash - your only course of action would be to run your own set of speaker wire to the rear.

See this picture... these are the plugs that should go into your factory radio....

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Metra kit 71-1938 will go from your factory wiring directly into your factory radio.

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