2004 Toyota Corolla Car Stereo Wiring Diagram

Whether your an expert Toyota Corolla mobile electronics installer, Toyota Corolla fanatic, or a novice Toyota Corolla enthusiast with a 2004 Toyota Corolla, a car stereo wiring diagram can save yourself a lot of time. Automotive wiring in a 2004 Toyota Corolla 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 2004 Toyota Corolla.

The Modified Life staff has taken all its Toyota Corolla car radio wiring diagrams, Toyota Corolla car audio wiring diagrams, Toyota Corolla car stereo wiring diagrams, Toyota Corolla car radio wiring schematics, Toyota Corolla 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 2004 Toyota Corolla part or component.

Feel free to use any Toyota Corolla 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 Toyota Corolla wiring information is at your own risk. Always verify all wires, wire colors and diagrams before applying any information found here to your 2004 Toyota Corolla.


If you have any questions pertaining to the audio system in the 2004 Toyota Corolla, 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.

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2004 Toyota Corolla Car Stereo Wiring Diagram

Car Radio Battery Constant 12v+ Wire: Blue/White
Car Radio Accessory Switched 12v+ Wire: Gray
Car Radio Ground Wire: Brown
Car Radio Illumination Wire: Green
Car Stereo Dimmer Wire: White/Black
Car Stereo Antenna Trigger Wire: Black
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 (+): Pink
Left Front Speaker Negative Wire (-): Violet
Right Front Speaker Positive Wire (+): Light Green
Right Front Speaker Negative Wire (-): Blue
Car Audio Rear Speakers Size: N/A
Car Audio Rear Speakers Location: N/A
Left Rear Speaker Positive Wire (+): Black
Left Rear Speaker Negative Wire (-): Yellow
Right Rear Speaker Positive Wire (+): Red
Right Rear Speaker Negative Wire (-): White

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  • Reply Allen April 13, 2008 at 11:15 pm

    Car Stereo Antenna Trigger Wire: Black
    Left Rear Speaker Positive Wire (+): Black

    Hello, I tried to hook up my system in my corolla 2004, but I can not get a signal to the subs. I have power to the amp but no sub sound. I brought a low lever inverter for the rca jacks and hooked up the speaker using the diagram. I only saw 1 black wire which was the speaker wire. Now, is that the antenna wire too. Please let me know Thanks.

  • Reply ModifiedLife April 14, 2008 at 1:03 am

    Allen, there should be two black wires. The black wire for the left rear speaker positive wire should be located next to the left rear speaker negative wire. Hope this helps.

  • Reply Roger Nin May 27, 2008 at 10:59 am

    I have a 2004 Toyota Corolla. I found the wiring diagram for it here, but it doesn´t talk about de tweeters. This car come with tweeters on front doors sail part. What about the wiring of the tweeters????

  • Reply ModifiedLife May 27, 2008 at 8:37 pm

    Roger, the front speakers are tied into the tweeters. Sending an audio signal to your front speakers will power the front tweeters. Hope this helps. Good luck.

  • Reply j bone November 5, 2008 at 12:28 pm

    which wire on the factory head unit of a 04 toyota corolla do i connect my remote wire to and from my amp?

  • Reply ModifiedLife November 10, 2008 at 4:35 am

    Roger Nin, technically you could connect your amplifier turn on wire to the radio switched 12v+ wire. That way your amplifier is on whenever the car is on and off whenever your car 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.

  • Reply DAVID DONAR February 12, 2009 at 2:32 pm

    I have a 2004 Corolla S with a factory AM/FM radio with a CD & cassette tape player. I would like to know if that particular radio has the red & white RCA jacks in the rear so I can hook up my mp3 player with a patch cord. If not, what do you recommend for the best sound performance. The latest issue of Popular Mechanics, March, 2009, addresses the different ways to hook-up your radio to an mp3 player.

  • Reply BobCov June 14, 2010 at 10:41 pm

    Arggh! Never send an amateur to do a professional’s job. I changed the rear speakers in my 2004 LE to some Kenwood 6×9 (KFC-m6940ie) thinking they would have to sound better. They did not fit, so I had to build some brackets to hold them in place. They sound worse than the factory OEM. I tried reversing the polarity on the Kenwoods in case i had that wrong. Still sounds bad. The radio is a Pioneer DEH-2200UB. The old speakers were 6 ohm and the new ones are 4 ohm. Is this a bad combination? Is it important to have zero gaps between the edge of the speakers and the back window dash? I really thought these would improve the sound. I’m very surprised and open to suggestion.

  • Reply ModifiedLife June 17, 2010 at 12:46 am

    BobCov, yes having different ohm rated speakers would be problem. You would need to match up your aftermarket head unit ohm rating with the same ohm rating for your speakers. Audio will not play properly if you do not match them up. Our advice is to change your speakers to 6-ohm speakers to work with your 6-ohm aftermarket head unit. As for the edge of the speakers being flush against the mounting surface, it is recommended that you have zero gaps to achieve the best bass output. Hope this helps. Good luck with your 2004 Toyota Corolla speaker installation.

  • Reply Devman July 21, 2010 at 10:31 pm

    I am installing a sub an amp into my girlfriends 2004 Corolla. It has the stock AM/FM tuner with a CD player. The stock head unit doesn’t have RCA cables on it so I was wondering if I will still get good sound out of the sub if I tap into the rear speaker wires to run to the amp? I really don’t want to buy a new head unit just for the RCA’s but I still want to get good sound out of the sub.

  • Reply ModifiedLife July 27, 2010 at 1:16 pm

    Devman, if your car amplifier has speaker or preamp-level inputs then yes, you can use the rear speaker wires to provide an audio signal to your amp. Hope this helps. Good luck with your 2004 Toyota Corolla sub and amp installation.

  • Reply Russell Jackson September 27, 2011 at 5:13 am

    I have a Toyota Corolla 2004 model which has a remote Toyota 6-CD Changer (Type: 74833 Model 06601-00911) situated under the front passenger seat. I want to remove the 6-CD Changer and feed the signal from my iPod (either iPod connector or headphones jack output) so that I can play it through the car speakers. The cable coming from the Car Radio terminates in a 12 pin female socket. Does anyone have the pin-out specification form the CD Changer to enable me to find the right terminals to connect to? Many thanks!!

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