2009 Cadillac CTS Car Radio Wiring Diagram

Whether your an expert Cadillac CTS mobile electronics installer, Cadillac CTS fanatic, or a novice Cadillac CTS enthusiast with a 2009 Cadillac CTS, a car stereo wiring diagram can save yourself a lot of time. Automotive wiring in a 2009 Cadillac CTS 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 2009 Cadillac CTS.

The Modified Life staff has taken all its Cadillac CTS car radio wiring diagrams, Cadillac CTS car audio wiring diagrams, Cadillac CTS car stereo wiring diagrams, Cadillac CTS car radio wiring schematics, Cadillac CTS 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 2009 Cadillac CTS part or component.

Feel free to use any Cadillac CTS 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 Cadillac CTS wiring information is at your own risk. Always verify all wires, wire colors and diagrams before applying any information found here to your 2009 Cadillac CTS.


If you have any questions pertaining to the audio system in the 2009 Cadillac CTS, 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.

2009 Cadillac CTS Car Radio Wiring Diagram

Car Radio Battery Constant 12v+ Wire: Orange
Car Radio Accessory Switched 12v+ Wire: The radio harness does not provide a switched power source. Run a wire to the Fuse Box or steering column for switched power.
Car Radio Ground Wire: Black/White
Car Radio Illumination Wire: N/A
Car Stereo Dimmer Wire: N/A
Car Stereo Antenna Trigger Wire: White
Car Stereo Amp Trigger Wire: There is no amplifier turn on wire for this vehicle. The amplifier turn on signal is received through the lan serial wire.
Car Stereo Amplifier Location: In the trunk on the passenger side of the trunk behind the trim.
Car Audio Front Speakers Size: N/A
Car Audio 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
Car Audio Rear Speakers Size: N/A
Car Audio 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


  • Reply Jerry Greiner December 12, 2010 at 8:35 pm

    My 2009 CTS has the basic XM stereo. It has no auxilary jack in the console. Does the back of the stereo unit have a USB input the I can attach my own USB cable?

  • Reply ModifiedLife December 19, 2010 at 5:36 pm

    Jerry, most late model vehicles do not have USB input on the factory radio. You would have to install an aftermarket radio that has a USB input:

    After Market Radios with USB Input

    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 2009 Cadillac CTS stereo installation.

  • Reply George B April 20, 2011 at 7:29 am

    I have the 2009 CTS with NAV and 4g. It came with XM. I have a lifetime subscription with Sirius. I would rather switch the XM over to Sirius and pay $5 a month for the extra reciever than buy XM lifetime for $700+. XM is charging $35 every 3 months now. Can this be done using the factor system in the car? If I have to replace the factor system is it going to cost more than the $700 for XM lifetime? Thanks for any help you can provide.

  • Reply carlos May 13, 2011 at 1:48 pm

    hi there wanted know if you guys can help me with speaker wiring/color diagram for 2004 cadillac cts. thanks in advanced.

  • Reply ModifiedLife May 17, 2011 at 12:25 am

    Carlos, ask and you shall receive: 2004 Cadillac CTS Car Stereo Wiring Diagram

  • Reply carlos May 17, 2011 at 1:03 am

    i need color diagram for speakers for a 2004 cadillac cts. wanted to know also if i can use the stock wiring from stock amp to connect my aftermarket amp and speakers. or should i run new wiring. thanks in advance.

  • Reply ModifiedLife May 26, 2011 at 2:10 am

    Carlos, ask and you shall receive: 2004 Cadillac CTS Car Radio Wire Schematic

  • Reply Val January 2, 2013 at 3:42 am

    Is it possible to add a USB port or factory iPod controls to an 2009 cadillac cts that didn’t come with the factory option? anyone know?

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