Identifying the stock tire well sub

[Satiagraha]

Ok, so my friend has an '03 P5 with a completely stock system, including the tire well subwoofer. He bought a new HU and we want hook the sub up on it's own channel. We figure that we will just cut the signal wire to the sub and run a new wire direct from the HU.
The problem is that we can't figure out what each of the wires going into the sub are. The sub is connected via an 8-pin connector.

Wires of the 8 pin connector:

• black/red
• black/white
• red
• white
• white/blue
• yellow
• green
• green/black

According to this chart, there's several other signal channels, an amp remote wire, inverted dimming, and an unlisted green/black wire. This doesn't seem to make much sense, so I was wondering if anyone knew where the sub gets it's power (which wire?), and what are the signal inputs? I figure the yellow really is the amp remote wire.
Could someone please identify the 8 wires?

 

[1sty]

That harness diagram is not going to help at all. It is for the connection to the head unit and those colors are unlikely to line up with the ones on the subs harness.

4 wires will be the speaker signals.
Fade to the front and then rear to determin which drive the subs singal.
1 will be constant power, although it could be 2.
1 will be ground, although it could be 2.
1 will be switched power

I would suggest investing an a multimeter.
Regardless, you will not have to do anything when installing a new deck to get the sub to work. It is already connected and not soley to the head unit. The most you will have to do is tap a new switched power lead.

 

[Satiagraha]

That harness diagram is not going to help at all. It is for the connection to the head unit and those colors are unlikely to line up with the ones on the subs harness.

4 wires will be the speaker signals.
Fade to the front and then rear to determin which drive the subs singal.
1 will be constant power, although it could be 2.
1 will be ground, although it could be 2.
1 will be switched power

I would suggest investing an a multimeter.
Regardless, you will not have to do anything when installing a new deck to get the sub to work. It is already connected and not soley to the head unit. The most you will have to do is tap a new switched power lead.

Assuming that there's 4 signal wires, a constant power, a ground, and a switched power, that leaves one wire left. Do you think it's the yellow one, the amp remote wire?
Also, what is switched power? And why would the sub need 2 signals (a + and a - wire each = 4 wires)?
I shall get out my trusty multimeter and see if I can find out anything, but that will happen in about a week when my friend gets back from vacation

 

[1sty]

I have no idea which wire is which.
I have a feeling the oddball wire is either not actualy connected or it is a second ground or power wire.

Keep in mind that this is an old pioneer product, not a mazda product. It is still sold for the aftermarket in Europe I believe.

The sub needs 4 signal wires. Left +, Left -, Right +, and Right -

 

[Satiagraha]

ok, but why would the sub need 2 channels? I thought they were omnidirectional mono, not stereo.

also, what is switched power?

thanks 1sty for the help so far

 

[1sty]

The subwoofers range of sound can be recorded in seperate left and right tracks. So it is stereo. So to get all of the bass info car amps always have 2 channels of input even if there is only one channel of output.

Subs by nature in a car are omni directional as they play a range of sound that the human ear has diffuculty localizing. But they could technicly be setup as stereo.