2005 Cadillac STS Car Radio Wire Schematic

Whether your an expert Cadillac STS mobile electronics installer, Cadillac STS fanatic, or a novice Cadillac STS enthusiast with a 2005 Cadillac STS, a car stereo wiring diagram can save yourself a lot of time. Automotive wiring in a 2005 Cadillac STS 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 2005 Cadillac STS.

The Modified Life staff has taken all its Cadillac STS car radio wiring diagrams, Cadillac STS car audio wiring diagrams, Cadillac STS car stereo wiring diagrams, Cadillac STS car radio wiring schematics, Cadillac STS 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 2005 Cadillac STS part or component.

Feel free to use any Cadillac STS 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 STS wiring information is at your own risk. Always verify all wires, wire colors and diagrams before applying any information found here to your 2005 Cadillac STS.


If you have any questions pertaining to the audio system in the 2005 Cadillac STS, 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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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.

2005 Cadillac STS Car Radio Wire Schematic

Car Radio Battery Constant 12v+ Wire: Red/White
Car Radio Accessory Switched 12v+ Wire: Dark Green (This vehicle uses the can data network for accessory turn on.)
Car Radio Ground Wire: Black/White
Car Radio Illumination Wire: N/A
Car Stereo Dimmer Wire: Yellow
Car Stereo Antenna Trigger Wire: Pink
Car Stereo Amp Trigger Wire: Dark Green (This vehicle uses the can data network for amplifier turn on.)
Car Stereo Amplifier Location: The amplifier is located behind the trim panel on the left side of the cargo area.
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 (-): Dark Green
Right Front Speaker Positive Wire (+): Dark Green
Right Front Speaker Negative Wire (-): Light Green
Car Audio Rear Speakers Size: N/A
Car Audio Rear Speakers Location: N/A
Left Rear Speaker Positive Wire (+): Brown/White
Left Rear Speaker Negative Wire (-): Brown
Right Rear Speaker Positive Wire (+): Dark Blue
Right Rear Speaker Negative Wire (-): Tan


  • Reply eric guubb December 31, 2011 at 11:01 am

    i have a 2005 cadillac sts the stereo and navigation system stopped working.Every once and awhile the screen will come on and says system loading other times the radio will come on when i start the car but i can not control it. i use to have a heated steering wheel this is also not working know not sure if it has anything to do with it checked all the fuses with a multimeter for continuity all appear good any ideas?

  • Reply ModifiedLife January 3, 2012 at 12:16 am

    Eric, double check ALL your fuses using an Automotive Fuse Tester because certain vehicles may have a wire tied into another circuit not labeled as car radio. You may have additional fuse boxes by the driver side of the dash, passenger side of the dash, driver kick panel, passenger kick panel, under the steering column or under the hood. If all of your fuses are good, your 2005 Cadillac STS electrical wiring may be faulty. We suggest you take your car to an experienced audio installer or mechanic and have them troubleshoot your problem. Hope this helps. Good luck with your 2005 Cadillac STS troubleshooting.

  • Reply jason March 10, 2012 at 2:23 pm

    I have a 2005 Cadillac STS, and I want to install a aftermarket radio, but I don’t want to lose the functionally of the the car since the stock radio acts like a brain for the car(all the car settings run through it). Is there a way to keep the stock stereo in the car and still install a aftermarket radio?

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