8-pin Aux Retention Harness
for Subaru cars

Fits:
2007–2014 Impreza / OBS *
2012–2014 Crosstrek *
2007–2015 WRX / STi *
2007–2015 Forester *
~2007–2009 Legacy / Liberty / Outback **

* Base-level car models whose OEM Head Units have aux but
do not have Navigation or built-in Bluetooth or USB
** Car models in countries outside North America with certain OEM HUs (see details below)

Allows you to retain your car's factory 3.5mm aux jack
without cutting or splicing any factory wires!

Picture of Subaru 8-pin aux retention harness with 3.5mm plug
(Click to see larger annotated image)

Applications:

  • Retain your Subaru's factory 3.5mm stereo aux jack when you install an aftermarket head unit

  • Retain OEM rear cargo subwoofer speaker in certain 2007–2008 Forester models

  • Retain OEM under-seat subwoofer speaker in certain 2009–2011 Forester models

  • Retain car's audio steering wheel controls (SWCs) in certain Legacy/Liberty and Outback models (outside North America) -- cars with certain GX-204 OEM HU models  (steering wheel interface adapter module also required for most head units).

Product Description

In Subaru models listed at the top of this page, the factory HU has an 8-pin socket on the rear for its aux input.  A factory harness connects from the back of the HU to the back of the 3.5mm aux jack (in the armrest center console in most models, or an "ashtray" pod in 2007 Impreza/WRX/STi and 2007–2008 Forester).  That harness has proprietary plugs at both ends.  The harness handles the stereo aux jack only, not the USB socket (if your car also has one).

The white 8-pin connector on my aux retention adapter fits the end of the car's aux harness that is (or was) plugged into the back of your factory-installed HU.

I'm currently offering this harness in either of two options for the aux connection:

  • With a ~15 cm (~6") cable with a male stereo 3.5 mm plug, price $20

    Picture of Subaru 8-pin aux retention harness with 3.5mm plug
    (Click to see larger image)

  • With three plain wires ~75 mm (~3") long, for aux audio left, right, and ground, price $12.  To those wires you would need to solder a male 3.5mm plug or male left/right RCA plugs (whichever is needed for the aux input port you wish to use on the rear of your new HU).

    Picture of Subaru 8-pin aux retention harness with 3 plain wires
    (Click to see larger image)

  • Originally, I had been offering this aux harness with left+right male RCA plugs.  I have a small number of those available.  If you're interested, let me know by e-mail before you check out.

    Picture of Subaru 8-pin aux retention harness with 3 plain wires
    (Click to see larger image)

Retain OEM "Odd-shaped" Subwoofer

Some 2009–2011 Foresters have the "odd-shaped" (non rectangular) factory-installed under seat subwoofer shown in this thread.  In those cars, the OEM HU has a line-level subwoofer output on the aux harness.  HU models with the 8-pin socket include PP243K6, PP343R6, and PP443L6 (and possibly others).

I can build my 8-pin aux harness with an additional male RCA plug and 8" (~200 mm) long amp remote turn-on lead.  Prices: add $13 to the above configurations (3.5mm, plain wires, or RCA), or $20 for a harness with only the male subwoofer RCA and amp trigger lead (no aux plug or wires).

Picture of Subaru 8-pin aux and subwoofer retention harness
(Click to see larger image)

Note: The subwoofer RCA plug is only needed on cars which had the "odd-shaped" sub fitted by the factory.  In cars that do not have that sub, the corresponding wires are not present in the factory harnesses (cars are not pre-wired for that sub).  The accessory rectangular-shaped sub does not need (and cannot use) this RCA plug.

Retain Audio Steering Wheel Controls

Some Legacy/Liberty and Outback models use the same type of 8-pin harness plug for the HU's aux input and/or audio steering wheel controls.  HU models include GX-204JE, GX-204JH, GX-204KH, GX-204LE, GX-204SE (and possibly others).

I can build my 8-pin aux harness with the two corresponding SWC wires.  E-mail me the model information on your car and factory HU so we can discuss what you'll need.

Prices: $20 for 8-pin aux retention harness with male 3.5mm plug only

$20 for 8-pin aux retention harness with male left+right RCA plugs
(very limited quantity available)

$12 for 8-pin aux retention harness with 3 plain 3" wires only

$13 Add male RCA plug and amp trigger lead to any of the above configurations
(to retain OEM odd-shaped under-seat subwoofer)

$20 for 8-pin aux retention harness with male RCA plug and amp trigger lead only
(to retain OEM odd-shaped under-seat subwoofer) — no aux plugs or wires

Click here to see ordering instructions