Install an after-market head unit in the 2008-up Impreza
/ WRX / STI / OBS and 2009-up Forester (without OEM Kenwood or TomTom
navigation), and most 2010-up Legacy / Liberty / Outback.
Retain use of your car's audio Steering Wheel Controls
(interface adapter module required for most head units. I also have the
Axxess ASWC interface available. See this page for more info).
Note: If you want to keep your factory HU and add a
subwoofer, speaker amplifier, Line Output Converter (LOC), audio
processor, gauges, phone car kit, or any other application where you
need to tap off or connect between wires on the radio harness, see this combined 20-pin forward/reverse harness.
For older model years and 2008-2012 Imprezas and
Foresters with OEM Kenwood or TomTom navigation, please see this 14-pin wiring adapter.
Ask me about a 24-pin harness to retain your SWCs, aux, etc.
Harnesses from other after-market manufacturers omit wires for
the Steering Wheel Audio Controls. 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).
The wires on my harness have the same EIA-standard
color-coding as other after-market harnesses, with printed labels (for
example, "Left Front Speaker +") and pre-stripped ends ready for you to
crimp or solder to the harness that comes with your new radio. All
- Four speakers (8 wires)
- +12 Volt Accessory (key-switched)
- +12 Volt Memory/Battery (always-on)
- Power antenna control (remote turn-on for motorized antenna
or antenna booster amplifier)
- Illumination ("Illumination +") — used for dimming on
many aftermarket HUs
- Audio Steering Wheel Controls (3 wires)
Ask me about including these additional wires (for special
projects, or when you're keeping your factory radio and adding an
amplifier, subwoofer, gauges, or other accessories):
- 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 some 2012–up Impreza and Crosstrek, and 2014
Forester models.  WRX and STI through 2014 do NOT have this.
See my Subaru
20-pin pin-out table for more information about the factory wires.
What other harnesses and
adapters do you need? Want to retain your factory aux and USB
For 2009-up Forester, 2008-up Impreza / WRX/ STI / OBS and
Crosstrek, plus 2012-up Legacy / Outback with OEM HU model CE617U1, see
$12 (with 3 SWC wires)
Also available: Axxess ASWC steering wheel
See this page for more info.