Here is the stereo radio wiring information for your 2012 Subaru Impreza WRX body with the standard or amplified systems. It will be useful when installing an aftermarket radio, sound stereo system, or other automotive accessories. Make sure to grab the appropriate tools to test all the wires in your Impreza WRX. Please check it over and use it as a GUIDE to help you locate the appropriate wires. This schematic is provided free of charge and may not be 100% accurate. Failure to properly test all the wires may lead to vehicle or bodily damage. All information is provided as-is and accuracy is not guaranteed.
If you find any conflicting info please leave a comment with what you found in your Subaru Impreza. If you don’t see the audio radio wiring diagram you need comment and we will try to add it ASAP. Thanks for looking!
2012 Subaru Impreza WRX Audio Wiring Radio Diagram Schematic Colors – Aftermarket Stereo Installation Help
Car Radio Constant 12v+ Wire: Blue/Red @ Radio Harness
Car Stereo Ground Wire: Black @ Radio Harness
Car Radio Ignition Switched Wire: Yellow/Red @ Radio Harness
Car Radio Illumination Wire: Purple @ Radio Harness
Car Stereo Power Antenna: Yellow/Black @ Radio Harness
Car Radio Amp Turn On Wire: N/A
Left Front Speaker Wire (+) Positive: Blue/Orange
Left Front Speaker Wire (-) Negative: White/Black
Right Front Speaker Wire (+) Positive: Brown/Yellow
Right Front Speaker Wire (-) Negative: Green
Left Rear Speaker Wire (+) Positive: White/Red
Left Rear Speaker Wire (-) Negative: Red/Black
Right Rear Speaker Wire (+) Positive: Gray/Green
Right Rear Speaker Wire (-) Negative: Red/White
SPEAKER WIRE COLORS AT THE SPEAKERS IN THE DOORS
Left Front Door Speaker Wire (+) Positive:
Left Front Door Speaker Wire (-) Negative:
Right Front Door Speaker Wire (+) Positive:
Right Front Door Speaker Wire (-) Negative:
Left Rear Door Speaker Wire (+) Positive:
Left Rear Door Speaker Wire (-) Negative:
Right Rear Door Speaker Wire (+) Positive:
Right Rear Door Speaker Wire (-) Negative:
Center Channel Speaker Wire Positive / Negative: N/A
Subwoofer Speaker Wire Positive / Negative: N/A
Retain OEM USB In Center Console
This cable will plugin behind the radio and keep your OEM USB functional with a new aftermarket radio:
Retain OEM AUX In Center Console
Take a normal rca cable and cut one end off leaving yourself RCAs and a foot or two of slack. Strip the left and right ends twist the common shields together and then connect them to the following wires:
OEM AUX Left (+) Positive: Yellow – On models with OEM Bluetooth @ White 16 Plug Pin 3
OEM AUX Right (+) Positive: Blue – On models with OEM Bluetooth @ White 16 Plug Pin 4
OEM AUX Common Shield: Black – On models with OEM Bluetooth @ White 16 Plug Pin 11
Radio Size: Single or Double Din
Radio Removal Tools: – Dash Removal Plastic Pry Tools
Keep in mind if you are installing a new radio in your Impreza you need the wiring harness, the antenna adapter, steering wheel control module, and the mounting kit as well.
REQUIRED PARTS FOR AFTERMARKET RADIO INSTALL
BASE SYSTEM WIRING HARNESS:
MOUNTING KIT FOR DOUBLE DIN AFTERMARKET RADIOS:
MOUNTING KIT FOR SINGLE DIN AFTERMARKET RADIOS:
ANTENNA ADAPTER:
N/A
STEERING WHEEL CONTROLS ADAPTER:
Metra Axxess ASWC-1 Universal Steering Wheel Control Interface
ASWC-1 Installation Instructions:
Connect the red wire to the red switch lead from your aftermarket radio.
Connect the black wire to the black ground lead from your aftermarket radio.
Connect the green/orange from the ASWC-1 to the brown wire in pin 4 in the main radio connector.
Connect the black/green from the ASWC-1 to the blue/white wire in pin 13 in the main radio connector.
Connect the yellow wire in pin 14 in the main radio connector to ground.
SPEAKER WIRING ADAPTERS:
N/A
RECOMMENDED TOOLS FOR THE INSTALL – SAME ONES THE PROS USE!
– Gardner Bender Auto Wire Stripper
plug either the aux or the rcas into the back of your new aftermarket radio depending on what type of audio input they have. Then cut off the other end and splice into the following wires at the 14-pin connector found behind the radio:
to easily get the job done.
they work great and are an excellent bang for the buck! Or the 
if you want to replace your OEM tweeters in the dash as well.