2004 Hyundai sonata stereo wiring diagram

Question edited for clarity, year MAKER model in that order, plus a few capital letters for 'proper names'.
Question moved to make model category.

Full wiring diagrams can only be found in Service Manuals at a cost, or by a subscription with AllData. You can however get partial wiring diagrams for free if you click on the images tab. Google :-

year make model (the part) wiring diagram.

https://www.google.com/search?q=2017+Hyundai+Sonata+Turbo+2.0.+Wiring+diagram

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https://www.modifiedlife.com/2004-hyundai-sonata-radio-wiring-diagram/

https://www.modifiedlife.com/2004-hyundai-accent-car-stereo-radio-wiring-diagram/comment-page-1/

http://90.84.dh.lariches.de/hyundai-accent-wiring-diagram.html

. Hope it solves you problem. Car Stereo Radio Wiring Diagram 2004 Hyundai Elantra

hope this helps http://www.modifiedlife.com/1998-hyundai-sonata-car-audio-wiring-diagram/

1997 Hyundai Sonata Car Stereo Radio Wiring Diagram
Car Radio Constant 12V+ Wire: Red
Car Radio Switched 12V+ Wire: White/Green
Car Radio Ground Wire: Black
Car Radio Illumination Wire: N/A
Car Stereo Dimmer Wire: N/A
Car Stereo Antenna Trigger: N/A
Car Stereo Amp Trigger Wire: N/A
Front Speakers Size: 4′
Front Speakers Location: Dash
Left Front Speaker Positive Wire (+): Brown/White
Left Front Speaker Negative Wire (-): Black/White
Right Front Speaker Positive Wire (+): Brown/Yellow
Right Front Speaker Negative Wire (-): Black/Yellow
Rear Speakers Size: 6 1/2′
Rear Speakers Location: Door
Left Rear Speaker Positive Wire (+): Brown/Red
Left Rear Speaker Negative Wire (-): Black/Red
Right Rear Speaker Positive Wire (+): Brown/White
Right Rear Speaker Negative Wire (-): Black/Whi

Here's the wiring diagram

Battery ORANGE (+) RADIO HARNESS
Accesory YELLOW (+) RADIO HARNESS
Ground BLACK (-) RADIO HARNESS
LF Speaker (+) BROWN/WHITE
LF Speaker (-) BLACK/WHITE
RF Speaker (+) BROWN/YELLOW
RF Speaker (-) BLACK/YELLOW
LR Speaker (+) BROWN/RED
LR Speaker (-) BLACK/RED
RR Speaker (+) BROWN/WHITE
RR Speaker (-) BLACK/WHITE

there is two wires then suposed to be same color they are not what you looking for but if you have a grey and a black wires it willl be one of those i hope and this help