Radio Wiring Adapter (Harness)
for Subaru & Toyota cars

Picture of Subaru 10- & 6-pin radio installation adapter harness
(Click to see larger image)

2012–up Impreza / WRX / STi *
2012–up Crosstrek *
2012–up Forester *
* models with factory Fujitsu Ten navigation

2013–up BRZ

2012–2014 Legacy / Outback / Liberty **
** models with factory Fujitsu Ten navigation & Panasonic display head units

Most 1987–up Toyota & Scion models

Allows you to install a new, after-market radio in your car
without cutting or splicing any factory wires!


  • Install an after-market head unit (HU) in recent Subaru, Toyota, and Scion models  (any car where these harnesses fit: Metra 70-1761, Scosche TA02B, American International TWH-950, Aerpro AP1761, etc.).

Note: If you want to keep your factory head unit and add a subwoofer, speaker amplifier, Line Output Converter (LOC), audio processor, gauges, phone car kit — any application where you need to tap off or connect between wires on the power/speaker harness — see this combined 10- & 6-pin forward/reverse harness.  You do not need the combined harness when switching to an aftermarket HU.

What other harnesses and adapters do you need?
Want to retain your factory Steering Wheel Controls (SWCs) and aux and USB sockets?
Need harnesses for different models or non-navigation?

See this link:

Aftermarket Audio Installation — Parts Needed Guide

Features on this 10- & 6-pin harness:

  • EIA-standard color-coding (same as other after-market harnesses and HUs)
  • Printed labels on wires (for example, "LEFT FRONT POSITIVE")
  • Pre-stripped ends ready for you to crimp or solder to the harness that comes with your new radio
  • All harnesses include these 13 wires:
    • Four speakers (8 wires)
    • Ground
    • +12 Volt Accessory (key-switched)
    • +12 Volt Memory/Battery (always-on)
    • Power antenna control (remote turn-on for antenna booster amplifier or motorized antenna)
    • Illumination ("Illumination +") — used for dimming on many aftermarket HUs

Notes About Power Antenna Lead

All Subaru models which use this harness include a lead to supply +12V power to the car's AM/FM antenna booster amplifier.

The standard version of this harness has the power antenna lead at pin #8 on the 10-pin harness, where it is needed for all Subaru models with Fujitsu Ten navigation.

Legacy and Outback models with non-navigation Panasonic display HUs (with 4.3" screen) require this lead at pin #4 on the 6-pin harness:

Picture of Subaru 10- & 6-pin harness with antenna lead on 6-pin
(click thumbnail to see larger image)

HU models include PE669U1, PE658U1, PE627U1, PE438L1, and PE427L1.  If you have one of these (or similar with 4.3" screen), be sure to tell me your factory HU model number when you order.

Most recent Toyota and Scion models do not have the power antenna lead on this harness.  Instead, it is a separate lead on the AM/FM antenna harness.  For those cars, you can extract the wire from the 10-pin harness to reduce the number of extra wires behind the HU.  You will need an antenna adapter that includes the power antenna lead.

Version With Speaker RCA Plugs

If your car has the OEM harman/kardon amplifier and speaker system, see this post.

I'm now recommending that people with the h/k amp use their aftermarket HU's line-level outputs.  You'll want the version of this harness with male RCA plugs instead of plain wires for the 4 speaker signals.

Picture of Subaru 10- & 6-pin harness with RCA plugs
(click thumbnail to see larger image)

Optional Leads

See my Subaru/Toyota 10- & 6-pin pin-out table for more information about the factory wires.

OEM Amp Remote Trigger Lead

In these models, the factory 10-pin harness includes a pin for +12V amplifier remote turn-on:

  • 2012–up BRZ & FR-S (for the factory amp for the door speakers)
  • 2014–up Forester models with Fujitsu Ten navigation and OEM harman/kardon amplifier and speaker system
  • 2015–up WRX/STi models with FT nav and OEM h/k system
  • 2013–up Legacy/Outback models with FT nav with OEM h/k system

The factory wire is at pin #9 on the 10-pin harness.  The above models will require a harness that includes a corresponding lead:

Picture of Subaru 10- & 6-pin harness with amp remote trigger lead Picture of Subaru 10- & 6-pin harness with RCA plugs
(click thumbnails to see larger image)

Add this lead (BLUE/WHITE) to the harness for an additional $2.

Illumination(–) Lead

For custom lighting projects (e.g., footwell lights, customized gauge illumination, etc.), ask me about adding the Illumination(–) lead for an additional $1.

Note: aftermarket HUs do NOT need (and cannot use) this.  Connect an aftermarket HU's "dimmer" wire to the "Illumination (+)" wire that I include standard!

Some Toyota models do not have this signal.  Check your car's harness or wiring diagrams before ordering.

  $7 (standard version 13 wires)
  $9 (standard + amp trigger lead — 14 wires)
  $11 (RCA version — 4 RCA + 5 wires)
  $13 (RCA version + amp trigger lead — 4 RCA + 6 wires)

Click here to see ordering instructions