Thanks for posting those. That connector looks like it's from a different family than any of the others I've seen in Subarus.
[referring to the original pictures] I'd need pictures that are in focus to look into this further. See if your camera has a macro mode (it might show an icon that looks like a flower). And/or back off a little at a time until it's able to focus. Hold the harness by the cable so the camera doesn't try to focus on your hand.
Incidentally, attached are the first two pages of the radio and "panel unit" service manuals that I found at 911manuals.com. The block diagram doesn't mention the aux input (but your CQ-EF8560X does have a 5th-channel subwoofer output, like the OEM HU in some 2006 Outbacks).
Oh, and it's really a 16-pin connector -- 7 pins on the top row and 9 pins on the bottom.
ADDED: I found the full service manual awhile back, which answers many questions.
Pin number assignments, looking at the rear of OEM head unit's harness i26 (car's wires pointed towards you), or at the socket on the back of the HU:
Code:
7 6 5 4 3 2 1
16 15 14 13 12 11 10 9 8
Pin-out from CQ-EF8560X service manual (page 3):
(click to see larger image)
Code:
1 "Super woofer" speaker output(+)
2 NC
3 NC
4 RSE Mute (input)
5 Rear On (output)
6 RSE Audio Right(+) **
7 RSE Audio Left(+) **
8 "Super woofer" speaker output(-)
9 NC
10 NC
11 Steering wheel audio controls(+) ("satellite switches")
12 Steering wheel audio controls(-) ("satellite switches")
13 Front On (input -- connect this to chassis ground to enable Aux input)
14 Shield Ground (may be NC inside HU)
15 RSE Audio Right(-) **
16 RSE Audio Left(-) **
** All inside shielded cable between HU and RSE unit
As kuoh posted elsewhere, pin 13 simply enables the HU's aux input function. So to connect an aux source, you should tie pin 13 to chassis ground (
not to your audio source). Pin 13 going into the HU is
not a ground of any kind -- it is a logic input into the HU's CPU.
UPDATE: I had found the full service manuals for the HU awhile back, but didn't have time to examine it and update this post until now. See PDF attached to
this post.
It turns out, the HU's RSE (aux) audio input wants to see balanced signals. Subaru has used this technique when there are longer distances between two devices (such as the HU and subwoofer, or HU and a separate amplifier for all of the speakers). This explains why people have found the Tribeca's aux volume level to be so low, and why they often get noise.
This page shows a small daughterboard in the HU. It has the 16-pin socket on the rear of the HU, a small two-channel op amp circuit to convert the RSE signals from balanced to unbalanced, and a bit of interface and protection circuitry for some of the other pins:
(click to see larger image)
Pins 6 and 7 are the positive sides of the right and left inputs, respectively. Pins 15 and 16 are the negative sides. So the PDF guide published awhile back has been telling people to connect the aux input to only the negative inputs!
According to the daughterboard schematic, pin 14 is actually not connected inside the HU. The PC board layout image (page 18 in the service manual) shows a place for a resistor (R844, value unknown) which would connect pin 14 to signal ground. But I don't think that part is populated.
I don't have a Tribeca to test, but my guess is that you should be able to wire an aux device as follows:
- Aux audio RIGHT to HU pin 6
- Aux audio LEFT to HU pin 7
- Aux ground to HU pins 15 and 16
- HU pin 13 to chassis ground (screw on HU's metal case)
If that doesn't work, also connect pins 15 and 16 to the HU's metal case (in addition to your aux ground).