Where can I get an '03 Hyundai Elantra radio wiring diagram?

Edited the first part for clarity.

Hyundai Santa Fe SE 2009 - SYSTEM WIRING DIAGRAMS

https://portal-diagnostov.com > 2020/03/26 > radio-hyu...

Mar 26, 2020 - RADIO - Hyundai Santa Fe SE 2009 - SYSTEM WIRING DIAGRAMS Radio Wiring Diagram, with Amplifier & Rear Seat Entertainment (1 of 2).

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  All Wiring Diagrams for Hyundai Santa Fe Limited 2009

  https://portal-diagnostov.com > 2020/07/22 > all-wiring...
  
  Jul 22, 2020 - All Wiring Diagrams for Hyundai Santa Fe Limited 2009 ; Manual A/C Wiring Diagram (2 of 2) for Hyundai Santa Fe Limited 2009. Rear A C Wiring ...

Hyundai Santa Fe (2006-2012) EMP300RDS pinout

https://pinoutguide.com > ... > Hyundai Santa Fe pinouts

Dec 10, 2019 - Hyundai Santa Fe (2006-2012) EMP300RDS pinout ... Audio Head units > Hyundai Santa Fe pinouts · 24 pin Hyundai Head Unit connector layout

2009 Hyundai Santa Fe Radio Wiring Harnesses - Crutchfield

https://www.crutchfield.ca > ISEO-rgbtcspd > ymm > 2...
Need a radio wiring harness for your 2009 Hyundai Santa Fe? Get free shipping and free lifetime tech support with your order.

http://ibb.co/mhYi4x

You can see the wire colors for your speakers. I found this diagram in my database, for your vehicle. Didn't your new radio come with instructions?
I'm not a stereo person, just thought the diagram might help?

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

The link below will take you to a diagram showing the firing order on your Elantra. This is for a 1.5L engine (most common for that year Elantra)

1996 Hyundai Elantra Firing Order

2000 Hyundai Elantra Car Stereo Radio Wiring Diagram
Car Radio Constant 12V+ Wire: Light Green
Car Radio Ignition Switched 12V+ Wire: Brown
Car Radio Ground Wire: Black
Car Stereo Illumination Wire: Dark Green/White
Car Stereo Dimmer Wire: Dark Green/Black
Car Stereo Antenna Trigger Wire: N/A
Car Stereo Amplifier Trigger Wire: N/A
Front Speakers Size: 5 1/4? Speakers
Front Speakers Location: Doors
Left Front Speaker Wire (+): Green/Red
Left Front Speaker Wire (-): Light Green/White
Right Front Speaker Wire (+): Red/Blue
Right Front Speaker Wire (-): Light Green/Black
Rear Speakers Size: 6? x 9? Speakers
Rear Speakers Location: Rear Deck
Left Rear Speaker Wire (+): Yellow/White
Left Rear Speaker Wire (-): Yellow/Blue
Right Rear Speaker Wire (+): Green
Right Rear Speaker Wire (-): Green/Blue

2003 Hyundai Elantra Car Stereo Radio Wiring Diagram
Radio Constant 12V+ Wire: Red
Radio Switched 12V+ Wire: Yellow
Radio Ground Wire: Black
Radio Illumination Wire: Pink
Radio Dimmer Wire: N/A
Radio Power Antenna Trigger Wire: Gray/Orange
Radio Amplifier Turn On Trigger Wire: N/A
Front Speakers Size: N/A
Front Speakers Location: N/A
Left Front Speaker Wire (+): White
Left Front Speaker Wire (-): Brown
Right Front Speaker Wire (+): Green
Right Front Speaker Wire (-): Orange
Rear Speakers Size: N/A
Rear Speakers Location: N/A
Left Rear Speaker Wire (+): Yellow
Left Rear Speaker Wire (-): Black
Right Rear Speaker Wire (+): Orange
Right Rear Speaker Wire (-): Blue


hope this helps out!

Personally owning this car and installing several Hyundai stereo's, I would purchase a wiring harness kit from car audio shop or electronics retailer. The wire harness has a plug that connects to the cars wiring harness. This wiring harness kit will also list the wires to connect your new aftermarket radio to the harness. I would also recommend using crimped **** connectors to attach the two harnesses together.

http://www.modifiedlife.com/2000-hyundai-elantra-car-radio-stereo-wiring-diagram/

try that

1998 Hyundai Elantra Car Stereo Radio Wiring Diagram
Car Radio Constant 12V+ Wire: Light Green
Car Radio Ignition Switched 12V+ Wire: Brown
Car Radio Ground Wire: Black
Car Stereo Illumination Wire: Dark Green/White
Car Stereo Dimmer Wire: Dark Green/Black
Car Stereo Antenna Trigger Wire: N/A
Car Stereo Amplifier Trigger Wire: N/A
Front Speakers Size: 5 1/4′
Front Speakers Location: Doors
Left Front Speaker Wire (+): Green/Red
Left Front Speaker Wire (-): Light Green/White
Right Front Speaker Wire (+): Red/Blue
Right Front Speaker Wire (-): Light Green/Black
Rear Speakers Size: 6′ x 9′
Rear Speakers Location: Rear Deck
Left Rear Speaker Wire (+): Yellow/White
Left Rear Speaker Wire (-): Yellow/Blue
Right Rear Speaker Wire (+): Green
Right Rear Speaker Wire (-): Green/Blue

Please rate my help.

Go to www.hmaservice.com and register( Vehicle by VIN). Afterward, you have access to shop manuals, service bulletins, wiring diagrams, etc. about your vehicle.