Radio Wiring Adapter (Harness)
for Subaru cars

2008–2015 Subaru Impreza / OBS / WRX / STi *
2012–2015 Crosstrek *
2009–2015 Forester *
2010–up Legacy / Outback / Liberty
Many recent Nissan models
*except models with factory navigation system

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

Picture of Subaru 20-pin radio installation adapter harness
(Click to see larger image)


  • Install an after-market head unit in the 2008–up Impreza / WRX / STi / OBS, 2012–up Crosstrek, and 2009–up Forester (without OEM Kenwood, TomTom, or Fujitsu Ten navigation), and many 2010–up Legacy / Liberty / Outback (any car where Metra 70-7552 or Scosche NN04B fits).

  • Retain use of your car's audio Steering Wheel Controls (interface adapter module required for most head units).

WRX, STi, Forester, Legacy, and Outback models with OEM harman/kardon speaker & amplifier system ask me about this version that connects to your new HU's line-level main speaker output RCA jacks:

Picture of Subaru 20-pin radio installation adapter harness with RCA plugs

(like Metra 70-7553 and Scosche NN05B, except includes 3 SWC wires)

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 radio harness — see this combined 20-pin forward/reverse harness.  You do not need the combined harness when switching to an aftermarket HU.

For older model years and 2008–up Imprezas and Foresters with OEM Kenwood or TomTom navigation, please see this 14-pin wiring adapter.  Ask me about my 24-pin secondary harness to retain your SWCs, aux, etc.

None of the other after-market harness manufacturers include the wires for the Audio Steering Wheel Controls (SWCs).  Some have even omitted the ground, power antenna, and illumination wires.  My harness avoids needing to tap into factory wires (the reason you use this kind of harness in the first place).

What other harnesses and adapters do you need?
Want to retain your factory aux and/or USB sockets?

See this page: 'Parts Needed' guides for car stereo installations in many Subaru and Toyota models

Features on my 20-pin harness:

  • EIA-standard color-coding (same as other after-market harnesses and HUs)
  • Printed labels (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 16 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
    • Audio Steering Wheel Controls (3 wires)

Ask me about adding these additional wires (for special cases):

  • CAN data bus (2 wires)
  • Illumination (–) for custom lighting projects (Note: aftermarket HUs do NOT need this — use the "Illumination +" wire that I include standard)
  • VSS (Vehicle Speed Signal) — only present on the factory harness on 2012–up Impreza (not WRX or STi) and Crosstrek, 2014–up Forester, 2015 WRX/STi models, and some Nissan models.  Older Impreza, WRX, STi, and Forester models do NOT have this.  Only some aftermarket navigation HUs need this signal.

See my Subaru 20-pin pin-out table for more information about the factory wires.

Installation Guide


$12 (with 3 SWC wires)

Click here to see ordering instructions

Also available: Axxess ASWC steering wheel interface module.
See this page for more info.