1999 Mercedes C280 Car Radio Wiring Guide

Whether your an expert Mercedes C280 mobile electronics installer, Mercedes C280 fanatic, or a novice Mercedes C280 enthusiast with a 1999 Mercedes C280, a car stereo wiring diagram can save yourself a lot of time. Automotive wiring in a 1999 Mercedes C280 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 1999 Mercedes C280.

The Modified Life staff has taken all its Mercedes C280 car radio wiring diagrams, Mercedes C280 car audio wiring diagrams, Mercedes C280 car stereo wiring diagrams, Mercedes C280 car radio wiring schematics, Mercedes C280 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 1999 Mercedes C280 part or component.

Feel free to use any Mercedes C280 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 Mercedes C280 wiring information is at your own risk. Always verify all wires, wire colors and diagrams before applying any information found here to your 1999 Mercedes C280.


If you have any questions pertaining to the audio system in the 1999 Mercedes C280, 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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1999 Mercedes C280 Car Radio Wiring Guide

Car Radio Battery Constant 12v+ Wire: Pink/Green
Car Radio Accessory Switched 12v+ Wire: Red/Blue
Car Radio Ground Wire: Brown
Car Radio Illumination Wire: N/A
Car Stereo Dimmer Wire: Gray/Blue
Car Stereo Antenna Trigger Wire: Blue/White
Car Stereo Amp Trigger Wire: N/A
Car Stereo Amplifier Location: N/A
Car Audio Front Speakers Size: 6 1/2″ Speakers
Car Audio Front Speakers Location: Doors
Left Front Speaker Positive Wire (+): Green
Left Front Speaker Negative Wire (-): Brown/Green
Right Front Speaker Positive Wire (+): Orange
Right Front Speaker Negative Wire (-): Brown/Orange
Car Audio Rear Speakers Size: 6 1/2″ Speakers
Car Audio Rear Speakers Location: Rear Deck
Left Rear Speaker Positive Wire (+): Pink
Left Rear Speaker Negative Wire (-): Brown/Pink
Right Rear Speaker Positive Wire (+): White
Right Rear Speaker Negative Wire (-): Brown/White

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  • Reply Ron January 19, 2012 at 6:50 pm

    Installed new radio in my 1999 mercedes c280. no sound to speakers. I have sound to all wires leaving radio and adapter plugs. there is an extra 3 wire plug from stock radio. I have adapter plugs from original radio to new radio . all colors match. is there a speaker relay that is not being energized. anyone?

  • Reply ModifiedLife January 26, 2012 at 2:16 am

    Ron, first double check ALL your fuses and make sure ALL your fuses are good. You can do this by using an Automotive Fuse Tester and making sure all of your fuses are not blown. If all of your fuses are good, your 1999 Mercedes C280 may have a factory amp that needs to be turned on by your after market radio. The car radio amplifier trigger wire has to be wired up to turn on your factory amplifier to output sound from your speakers. Double check that your 1999 Mercedes C280 amp turn on wire is connected. Hope this helps. Good luck with your 1999 Mercedes C280 stereo installation.

  • Reply Ron February 16, 2012 at 1:35 am

    Thank you for your information.. I have gone though the fuses and checked them they are fine.. now you speak of a factory amp.. I probably have that this has the bose speaker system.. I am not sure the location of the factory amplifier.. and if there is any inline fuses or unit fuses in amplifier also.. This is a factory radio and sound system not after market..The radio seeks and locks on stations but no sound at all from speaker not even static.. this car was bought new from the dealer and I’m the second owner and I thought the only problem was the radio code which I had and entered.. thanks. any idea of component locations would help.. thanks.

  • Reply Ronald C February 16, 2012 at 1:50 am

    I have a 1999 mercedes 280c factory radio not working.. I do not have any sound from the speakers not even static. the 1999 mercedes 280c radio has bose speaker system.. I have checked all the fuses in the fuse box. unless there are some inline fuses also. I am not sure but it may have an amplifier also due to bose speakers.. the system itself is a factory unit.. I could use a component location for an amplifier and also I might add that the radio powers up, seeks to stations and locks on. I sure would love to have some sound from the 1999 mercedes 280c speakers.. Please Help.. Thank you.

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