2008 Mazda 3 Car Stereo Wiring Diagram

Whether your an expert Mazda 3 mobile electronics installer, Mazda 3 fanatic, or a novice Mazda 3 enthusiast with a 2008 Mazda 3, a car stereo wiring diagram can save yourself a lot of time. Automotive wiring in a 2008 Mazda 3 vehicles are becoming increasing more difficult to identify due to the installation of more advanced factory oem electronics.

One of the most time consuming tasks with installing an after market car stereo, car radio, satellite radio, xm radio, car speakers, tweeters, car subwoofer, crossovers, audio equalizer, car amplifier, mobile amp, car amplifier, mp3 player, ipod or any car audio electronics is identifying the correct color car audio wires for your 2008 Mazda 3.

The Modified Life staff has taken all its Mazda 3 car radio wiring diagrams, Mazda 3 car audio wiring diagrams, Mazda 3 car stereo wiring diagrams, Mazda 3 car radio wiring schematics, Mazda 3 car wiring diagrams and cataloged them online for use by our visitors for free. Our automotive wiring diagrams allow you to enjoy your new mobile electronics rather than spend countless hours trying to figure out which wires goes to which 2008 Mazda 3 part or component.

Feel free to use any Mazda 3 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 car audio wiring diagrams listed on our enthusiast website are submitted by the Modified Life community. Use of the Mazda 3 wiring information is at your own risk. Always verify all wires, wire colors and diagrams before applying any information found here to your 2008 Mazda 3.


If you have any questions pertaining to the audio system in the 2008 Mazda 3, please feel free to post it at the bottom of this page and either we’ll do our best to find you the information you need or hopefully someone in the Modified Life community will have the information you’re looking for.

Request a Car Stereo Wiring Diagram

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

Adding More Information

If you would like to help the Modified Life community by adding any missing information or adding a new car audio wire diagram to our resource, please feel free to post it at the bottom of this page.

2008 Mazda 3 Car Stereo Wiring Diagram

Car Radio Battery Constant 12v+ Wire: Orange/Black
Car Radio Accessory Switched 12v+ Wire: Orange/Black with Silver Dots
Car Radio Ground Wire: Black/Green
Car Radio Illumination Wire: N/A
Car Stereo Dimmer Wire: Orange
Car Stereo Antenna Trigger Wire: N/A
Car Stereo Cell Phone Mute Wire: N/A
Car Stereo Amp Trigger Wire: N/A
Car Stereo Amplifier Location: N/A
Car Audio Front Speakers Size: N/A
Car Audio Front Speakers Location: N/A
Left Front Speaker Positive Wire (+): White/Black
Left Front Speaker Negative Wire (-): Gray/Black
Right Front Speaker Positive Wire (+): White/Red
Right Front Speaker Negative Wire (-): Gray/Red
Car Audio Rear Speakers Size: N/A
Car Audio Rear Speakers Location: N/A
Left Rear Speaker Positive Wire (+): White/Purple
Left Rear Speaker Negative Wire (-): Gray/White
Right Rear Speaker Positive Wire (+): White
Right Rear Speaker Negative Wire (-): Gray

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  • Reply shawn April 29, 2008 at 8:53 pm

    hey wondering if there is an output for an amp?

  • Reply Dennis Paul June 24, 2008 at 10:52 am

    The accessory switch wire orange/black with silver dots is only 12v when the headlights are on. it is not a true accessory wire that turns on with the key. I am currently looking for another wire on the radio that is a true accessory.

    and in response to Shawn there is no out for the amp you have to wire in a RCA converter behind the radio

  • Reply ModifiedLife June 24, 2008 at 12:22 pm

    Dennis, thanks for the car stereo wiring contribution!

  • Reply Simon Prud'homme September 4, 2008 at 10:29 am

    The Accessory wire is not the Orange/Black with Silver Dots, its the yellow one.
    The Orange/Black with Silver Dots is the illumination wire.

  • Reply ModifiedLife September 8, 2008 at 1:38 pm

    Simon, thanks for the car stereo wiring information contribution!

  • Reply Orlando November 8, 2008 at 7:12 pm

    Do I need a line out converter to get a good signal of the radio to an EQ or crossover from the Mazda3 head unit?

  • Reply ModifiedLife November 11, 2008 at 6:29 pm

    Orlando, yes if you have a stock radio, you would require a line out converter to provide your EQ or crossover an audio signal. Hope this helps. Good luck.

  • Reply Ryan Robinson March 28, 2009 at 6:06 pm

    I’m having trouble with in-line rca adapter (I thinkthat is what is called), it is so you can use the stock stereo and still hook up a system. Anyways on to the problem, my adapter has a positive and negative for the left and right, plus 2 brown wires (the instructions say these are rarely used but if you need to use them to hook them to the same ground that the stereo uses. My question is do i need to use these grounds? Or if it affects the quality of my sound or anything? Thanx for your time.

  • Reply Robert March 28, 2009 at 6:09 pm

    I’m installing a bluetooth kit and I’m trying to find a mute connection on the HU. I see it’s listed as N/A. Is this a fact or has anyone else had any luck muting the radio?

  • Reply ModifiedLife March 31, 2009 at 5:16 pm

    Ryan, the ground wire are used to reduce the chances of whining from feedback in the audio system. We would suggest you try hooking the in line rca adapter without the ground connections and only use the ground wire connections if your car stereo is getting whining sounds coming from the speakers. In most instances, the ground wire connection eliminates any feedback. Hope this helps. Good luck.

  • Reply raphael August 9, 2009 at 6:31 pm

    where should i wire the RCA adapter? to the front or rear speakers? thanks!

  • Reply ModifiedLife August 18, 2009 at 1:53 am

    Raphael, you should wire the RCA adapter to the rear speakers that way you get full range of audio. Hope this helps. Good luck on your audio install.

  • Reply GiBBO September 10, 2009 at 3:51 am

    was wondering if anyone knew how to use this radio outside the car. Particually the screen. My problem is that no information is shown on the screen . All other functions of the radio work. It may have something to do with another component on the CAN Bus has to first inititialise the screen

  • Reply josh October 9, 2009 at 11:24 pm

    i am trying to find a wiring diagram for my 2007 mazda 3 and when i click on the link it brings me here is the 2008 wiring diagram the same as the 2007?

  • Reply ModifiedLife October 26, 2009 at 4:37 pm

    Josh, ask and you shall receive: 2007 Mazda 3 Car Stereo Wiring Diagram

  • Reply Jon November 19, 2009 at 9:18 pm

    im trying to hook up a rca adapter to a stock stereo for a 09 mazda 3 and ran into a problem. i cant find a wiring diagram for it. im trying to find remote wire on harness but its not on the 08 diagram here. would u be able to help?

  • Reply ModifiedLife December 3, 2009 at 7:56 pm

    Jon, ask and you shall receive: 2009 Mazda 3 Car Radio Wiring Diagram

  • Reply Alec April 29, 2010 at 11:22 pm

    I’m installing 2 amps, 1-2 channel sub amp and 1-4channel amp to the factory deck. Which wire(what color) do I hook up the remote turn on’s to both amp’s?

  • Reply Dogger May 4, 2010 at 3:42 pm

    This has been an extremely helpful tool, I have had success with installing a LOC, amp, and subs in my 08 Mazda3 Touring S. Now I am trying to install a new double din JVC head unit. It looks like it’s just plug and play, however I am curious about the steering wheel controls. Do I need anything special to keep these working or are they connected with the other smaller harness in the back of the factory unit? If that’s the case does anyone have a diagram for that harness? Thanks for your help guys!

  • Reply ModifiedLife May 11, 2010 at 9:08 pm

    Alec, technically you could connect your 2008 Mazda 3 amplifier turn on wire to the radio switched 12v+ wire. That way your amplifier is on whenever your 2008 Mazda 3 is on and off whenever your 2008 Mazda 3 is off. Just make sure to run an in-line fuse holder with a 1-amp fuse on the amplifier turn on wire. Hope this helps. Good luck with your amplifier install.

  • Reply Brian May 13, 2010 at 10:57 am

    Would you have the wire colors and polarity for speakers for a 2010 Mazda 3 S Hatch.Non Bose 6 speaker system

  • Reply ModifiedLife May 24, 2010 at 11:07 pm

    Brian, ask and you shall receive: 2010 Mazda 3 Car Stereo Wire Color Codes

  • Reply Alex June 14, 2010 at 5:53 pm

    I wired a JL Audio Cleansweep into my Mazda 3, but after making all the connections, the cleansweep errors out with all red lights blinking, indicating that I do not have full range at any of the channels. Any idea why this could be? I verified my connections as I can Fade/Balance to every individual speaker and all connections are soldered and shrinkwrapped. I ran a 9 wire speed cable from the factory HU to the cleansweep. This is driving me nuts and right now all I have is a $300 LOC…

  • Reply Zac August 23, 2010 at 1:54 am

    I’m installing an after-market CD player in my 2008 Mazda 3 and I was wondering if i will be able to still use the controls on the steering wheel in order to work the deck ??.

  • Reply ModifiedLife September 1, 2010 at 4:14 pm

    Zac, it depends on which aftermarket radio you’re planning on installing. You will need a steering wheel control adapter to keep your factory steering wheel controls:

    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 2008 Mazda 3 steering wheel adapter installation.

  • Reply Michael September 4, 2010 at 9:08 pm

    Hey, I just wanted to know what the white with black and silver dots cable was, and the white with red too. Thanks!

  • Reply Vincent September 26, 2010 at 11:46 pm

    I am installing an amp and sub to my 08 madza 3 and I have the line out converter that has connections for all the speakers. So should I tap into all four of my speakers with the converter so that way my sub is perfectly balanced and not just connected to the rear? I just dont know if the sound will be messed up if I tap into only the rear, as far as the fade/balance goes. What do you think?

  • Reply ModifiedLife September 29, 2010 at 9:36 pm

    Vincent, when using a Speaker to RCA Line Out Converter tap your factory rear speaker wires to get a full range audio source. We suggest you invest in some solid wire taps that wont come loose. These wire tap connectors will allow you to tap into wires without cutting and installs in seconds by hand with no crimping or tools required. If you use a RCA Line Out Converter, it will be affected by fade and balance if you move the balance or fade away from the speaker you tapped. The only way your subwoofer will not be affected is if you use an after market car stereo with non-fading rca outputs. 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 2008 Mazda 3 subwoofer installation.

  • Reply Katie November 4, 2010 at 10:51 am

    I have a 2005 Mazda 3 and my 6 cd player recently died. I am looking to replace it. I was wondering if i can use a newer (newer than 2005) mazda cd player. Possily one with an ipod hookup? Does anyone know anything about this? Your help is much appreciated!!!!!!!

  • Reply Noel December 20, 2011 at 8:28 pm

    Hi there, I have a 2008 Mazda 3 car stereo taken out of the car’s dashboard after replacing it with an in-dash dvd/gps unit. I would like to use it at home as an stand alone unit but I don’t know how to power it. It has only 2 terminals to connect the wire kits. I would appreciate if you could help me with this matter. Thanks, Noel

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