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Old 04-10-2005, 01:34 AM   #10
SVXdc
Scooby Specialist
 
Member#: 25837
Join Date: Oct 2002
Chapter/Region: South East
Location: Atlanta, GA
Vehicle:
1996 SVX L AWD
Laguna Blue Pearl

Default Real aux-input on 2007 and later

"Real" Aux Input on 2007-up OEM Radios

Factory radios on some 2007 models have added a real Aux input to the 8-pin connector. Legacy/Outbacks removed the subwoofer output that was there on 2005-2006 models.

Front of Impreza/Forester radio, shown with new "ashtray module" (with the 3.5mm Aux input jack), and the interconnect cable:


The part number for just the ashtray aux pod is 86257SA010. The interconnect cable is not available from Subaru as a replacement part. It's only available with the 2007 radio.

UPDATE: dajohnson53 did the legwork to find how to order the interconnect cable as a Clarion repair part. See his post here (#323 in that thread). Note that if you have the similar radio from a Forester, you may need to modify the interconnect cable slightly to work. See my reply in that thread.

Rear of radio. Socket with green circle is for Aux input [and subwoofer output in some Foresters]. Other socket is new CeNET bus connector for the Subaru Sirius tuner module.

(Pictures posted by SilvrWRX in the thread OEM CD changer from 2007)

2007 Pin-out

Looking at the back of the radio the pins are numbered:
4 3 2 1
8 7 6 5
Pin assignments:

Quote:
2007 Impreza (radio model C-124 Clarion PF-2868A-A/B):

1 - Aux Input - Left
2 - Aux Input - Right
3 - NC
4 - Chassis Ground (used for aux enable)

5 - Aux Input - Audio Ground
6 - Aux input enable
7 - NC
8 - NC
Quote:
2007-2008 Forester (radio model C-123 Clarion PF-2851B-A/B):

1 - Aux Input - Left
2 - Aux Input - Right
3 - Satellite (steering wheel) switches + [no wire on USDM car's harness]
4 - Subwoofer out + (speaker-level)

5 - Aux Input - Audio Ground
6 - Aux input enable
7 - Satellite (steering wheel) switches - [no wire on USDM car's harness]
8 - Subwoofer out - (speaker-level)
Quote:
2007-up Legacy/Liberty/Outback:

1 - Aux Input - Left
2 - Aux Input - Right
3 - Satellite (steering wheel) switches +
4 - NC

5 - Aux Input - Audio Ground
6 - Aux input enable
7 - Satellite (steering wheel) switches -
8 - Dimming Cancellation (BRIGHT mode)

Note: USDM Legacys/Outbacks use a different physical 8-pin connector -- the one shown in post #5, above.
When you plug a cable into the factory 3.5mm jack, the tip of your plug physically presses a switch inside the aux pod. That switch connects the "Aux Enable" line to chassis ground (NOT pin 5 Audio Ground). That causes the HU to then allow you to press the CD/AUX button to toggle between those two modes. When nothing is plugged into the aux jack, the CD/AUX button only switches to CD mode.

When nothing is plugged in, the factory 3.5mm jack also shorts the audio L/R input lines to audio ground (so if you want to splice in a second audio cable in addition to the factory 3.5mm jack, you'll have to address this issue).

On this radio in 2007 Foresters, pins 4 and 8 are a 5th-channel, powered subwoofer output (still 65 Watts?), similar to prior years. It connects to a plain speaker in the rear cargo area of some Forester models.

More information and pictures in these posts:
OEM CD changer from 2007

2007 Spec B Radio information thread [this is for Legacy/Outback, which uses a different physical socket]
2008-up Pin-out (including 2011-up models without built-in Bluetooth and USB)

Pin assignments:

Quote:
2008-up Imprezas (models with 8-pin aux socket):

1 - Aux Input - Left
2 - Aux Input - Right
3 - NC
4 - NC

5 - Aux Input - Audio Ground
6 - Aux input enable
7 - NC
8 - NC
Quote:
2009-up Foresters (models with 8-pin aux socket):

1 - Aux Input - Left
2 - Aux Input - Right
3 - Subwoofer amp remote turn-on
4 - Subwoofer out + (line level, balanced)*

5 - Aux Input - Audio Ground
6 - Aux input enable
7 - Subwoofer out Audio Ground
8 - Subwoofer out - (inverted) (line level, balanced)*

* Starting in 2009, the subwoofer output on Forester radios (when present) changed to line-level. The sub out may not be present on any USDM cars. Originally I thought radios in 2008-up Imprezas had this too, but it appears that Foresters that did not have the rear powered sub and all Imprezas get a slightly different radio that does not have the sub output.

When present, the subwoofer output is balanced mono line-level. Pin 4 is positive polarity (in phase with the speaker outputs) and pin 8 is negative polarity (inverted voltage from the positive output) [EDITED- I previously wrote here that the negative output was 180 out of phase, but have learned that is not correct terminology]. The powered sub amp uses the two together to reduce noise. When connecting to most aftermarket equipment, you'll want to use only the + signal. It may help to also connect the negative polarity wire to ground.
Here are Subaru's installation instructions for the 2008 Impreza aux jack/harness (variation that goes in the center console), with part number:
2008 AUX Terminal Input Cable - Impreza (08M+) (H6210FG000) (PDF document)

2011-up Pin-out (models with phone/Bluetooth buttons on the steering wheel)

Pin assignments:

Quote:
2011-up Imprezas & Foresters:

Code:
 _   ________________   _
| ---                --- |
| 8  7  6  5  4  3  2  1 |
|16 15 14 13 12 11 10  9 |
 ------------------------
(viewing rear of OEM HU or wires side of car's harness):

Code:
Pin   Description
---   --------------------------
 1    Mic Audio In (+)
 2    Mic B+ (+5V supply)
 3    Aux In Left +
 4    Aux In Right +
 5    Subwoofer Amp Turn-On [only some Foresters]
 6    Subwoofer Out + (positive) [only some Foresters]
 7    Mic Shield [NC on most cars]
 8    NC

 9    Mic In Ground (-)
10    Mic Detect
11    Aux Audio Ground
12    Aux Enable
13    Subwoofer Shield [only some Foresters]
14    Subwoofer Out - (inverted) [only some Foresters]
15    NC [Parking brake on HUs with 4.3" screen]
16    NC [Reverse Gear on HUs with 4.3" screen]
See this thread for more info about the OEM amplified microphone.
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Last edited by SVXdc; 08-02-2013 at 10:06 PM.
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