Here is the stereo radio wiring information for your 2010 Subaru Legacy body with the standard or Harmon Kardon H/K 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 Legacy. 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 Legacy. If you don’t see the audio radio wiring diagram you need comment and we will try to add it ASAP. Thanks for looking!

2010 Subaru Legacy Harmon Kardon Audio Wiring Radio Diagram Schematic Colors – Aftermarket Stereo Installation Help

Car Radio Constant 12v+ Wire: Green/White @ Main Radio Harness
Car Stereo Ground Wire: Black @ Main Radio Harness
Car Radio Ignition Switched Wire: Yellow/Red @ Main Radio Harness
Car Radio Illumination Wire: Purple @ Main Radio Harness
Car Stereo Power Antenna: Yellow/Black @ Main Radio Harness
Car Radio Amp Turn On Wire: Pink @ 24-pin radio connector pin 23

Reverse / Backup Wire: Brown/Yellow (+) Driver Kick White 13-pin plug

Left Front Speaker Amp Feed Wire (+) Positive: Black
Left Front Speaker Amp Feed Wire (-) Negative: Green
Right Front Speaker Amp Feed Wire (+) Positive: Red
Right Front Speaker Amp Feed Wire (-) Negative: White

Left Rear Speaker Amp Feed Wire (+) Positive: White/Blue
Left Rear Speaker Amp Feed Wire (-) Negative: Orange/Green
Right Rear Speaker Amp Feed Wire (+) Positive: Blue/Yellow
Right Rear Speaker Amp Feed Wire (-) Negative: Blue

SPEAKER WIRE COLORS AT THE AMP UNDER PASSENGER SEAT

Left Front Door Speaker Wire (+) Positive: Brown
Left Front Door Speaker Wire (-) Negative: Green

Left Front Tweeter Speaker Wire (+) Positive: Green/Yellow
Left Front Tweeter Speaker Wire (-) Negative: Purple

Right Front Door Speaker Wire (+) Positive: Black/Red
Right Front Door Speaker Wire (-) Negative: White/Red

Right Front Tweeter Speaker Wire (+) Positive: Yellow
Right Front Tweeter Speaker Wire (-) Negative: White/Green

Left Rear Door Speaker Wire (+) Positive: Black/Blue
Left Rear Door Speaker Wire (-) Negative: White/Blue

Right Rear Door Speaker Wire (+) Positive: Black
Right Rear Door Speaker Wire (-) Negative: Yellow

Center Channel Speaker Wire Positive / Negative: N/A

Subwoofer Speaker Wire Positive / Negative: No special wiring is needed to retain.

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: White – On models with OEM Bluetooth @ White 24 Plug Pin 7
OEM AUX Right (+) Positive: Red – On models with OEM Bluetooth @ White 24 Plug Pin 8
OEM AUX Common Shield: Gray – On models with OEM Bluetooth @ White 24 Plug Pin 19

Radio Size: Single or Double Din

Radio Removal Tools: – Dash Removal Plastic Pry Tools – Use the pry tools to remove the bezel surrounding the radio. After that use a Phillips screwdriver the radio is held in with 4 screws.

Keep in mind if you are installing a new radio in your Legacy 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:

(Description may say for Nissan but it is the right one!)

Not as common but some models/options may require the following harness instead:

HARMON KARDON SYSTEM WIRING HARNESS:

(Description may say for Nissan but it is the right one!)
(Make sure to hook up the Pink amp turn on wire listed above or you will get no sound!)

MOUNTING KIT FOR DOUBLE DIN AFTERMARKET RADIOS:

(CARS WITHOUT OEM NAV ONLY)

BLACK:

SILVER:

MOUNTING KIT FOR SINGLE DIN AFTERMARKET RADIOS:

BLACK:

ANTENNA ADAPTER:

STEERING WHEEL CONTROLS ADAPTER:

Metra Axxess ASWC-1 Universal Steering Wheel Control Interface

SPEAKER WIRING ADAPTERS:

N/A

RECOMMENDED TOOLS FOR THE INSTALL – SAME ONES THE PROS USE!

– 3M Electrical Tape

– Install Bay Butt Connectors

– Gardner Bender Auto Wire Stripper

– Klein Wire Cutters / Crimpers

– Dash Removal Plastic Pry Tools