16-pin Aux Retention Harness
for Subaru cars

Fits:
20112014 Impreza / OBS *
20132014 Crosstrek *
20112015 WRX / STi *
20112015 Forester *
20122014 Legacy / Liberty / Outback **

* Cars whose OEM Head Units are non-navigation and have built-in Bluetooth and USB
** Cars with OEM HU model CE617U1

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

Picture of Subaru 16-pin aux retention harness
(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 under-seat powered subwoofer in certain 20112013 Forester models

  • Retain additional signals in certain Impreza, Crosstrek, and Forester models (details below)

Product Description

In Subaru models listed at the top of this page, the factory HU has a 16-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).  That harness has proprietary plugs at both ends.  The harness handles the stereo aux jack only, not the USB socket.

The white 16-pin connector on my aux adapter fits the end of the factory 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 $22

    Picture of Subaru 16-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 $14.  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 16-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 16-pin aux retention harness with male left+right RCA plugs
    (Click to see larger image)

Retain OEM "Odd-shaped" Subwoofer

Some 20112013 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 sub out on the 16-pin socket include CP635U1, CP435L1, and CP235K1 (and possibly others) HUs with 4.3" display.

I can build my 16-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 $22 for a harness with only the male subwoofer RCA and amp trigger lead (no aux plug or wires).

Picture of Subaru 16-pin aux and subwoofer retention harness
(Click to see larger image)

Note: The subwoofer RCA plug is only needed on Foresters 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 Car's Additional Signals

Non-nav 20122014 Impreza (not WRX or STi) and Crosstrek models have additional signals on the factory 16-pin harness: Parking Brake and Reverse Gear.  20112013 Forester models with HUs with 4.3" display also have those signals.  No other models/years have these signals on the factory 16-pin aux harness.

Non-nav 20142015 Forester and 2015 WRX/STi with the OEM harman/kardon amplifier and speaker system have the h/k amp remote trigger signal on the 16-pin aux harness.

I can build my 16-pin aux harness with corresponding wires for any of those signals .  E-mail me your car and factory HU information so we can discuss what you'll need.

Prices: $22 for 16-pin aux retention harness with male 3.5mm plug only

$22 for 16-pin aux retention harness with male left+right RCA plugs
(very limited quantity available)

$14 for 16-pin aux retention harness with only 3 plain 3" wires

$1 Add amp trigger lead to any of the above configurations (only for cars with OEM harman/kardon amp system)

$10 for 16-pin aux retention harness only with amp trigger lead (only for cars with OEM harman/kardon amp system) no aux plugs or wires

$1.50 each Add reverse gear or parking brake lead to any of the first 3 aux configurations above (only certain car models detailed above)

$13 Add male RCA plug and amp trigger lead to any of the first 3 aux configurations above (to retain Forester OEM odd-shaped under-seat subwoofer)

$22 for 16-pin aux retention harness with male RCA plug and amp trigger lead only
(to retain
Forester OEM odd-shaped under-seat subwoofer) no aux plugs or wires

Click here to see ordering instructions