More buzzy noise wiring problems, and WTF is "S.GND&quo

[Gonad]

OK, I had never installed a headunit before, so did a lot of reasearch on the net before I attempted it. Unfortunately none of the "standard" Totota wiring colours applied, bar a couple. I've seen the "install doctor" diagrams and they have nothing to do with my car!.

Found out the car had a "P500" plug and another one in the factory headunit, I unplugged the smaller plug and the unit still worked fine so god knows what it did, perhaps a link to a non existant stacker? I did nothing with this plug, its not the rear speakers either I dont think.

Anyway, after installing half the wires, I discovered to car had an underseat amp, choice but this is probably half the reason the wires are all screwed up colours.

P500, pin numbers and wire colours are as follows:

1 White - Amp wire (nothing would work till I gave this power)
2 Green - Illumination
3 Red - Accessory power - for when the keys in
4 Black - Constant power / memory
5 White - Mute
6 Blue - Front left
7 Red - Front right
8 Black, red stripe - Antenna
9 Empty - but supposedly "ILL-"
10 Empty
11 White, black stripe - Ground
12 Brown - "S.GND"
13 Black - Beep
14 Yellow - Rear left
15 Green - Rear right

Now I have no idea what S.GND is, second ground? Speaker ground? I wired up to #11 and did nothing with #12. Is that right?

Also, there are no speaker +ve and -ves in my car, i guess the amp sorts that out? At first I joined the +ve and -ve from the head unit together and hooked it up to, for example, #6 but it didnt really like it so in the end I just hooked up the negative speaker wires to the car and did nothing with the positve. Is that correct? In hindsight I think not.... as there is that buzzing whine that gets louder when the engine revs higher.

Maybe I need to hook up the +ve's rather than the -ve's then join all the negatives together and attach that to S.GND.

So I guess this post is two things. Number 1: hopefully useful to someone down the track with the same setup. Number 2: I've f*&%#d something up please tell me, I dont know what I'm doing and dont want the car to catch on fire or something.

Cheers

[scotty_ish]

My guess for s.grnd would ba a common speaker ground? might explain why there are no negatives for the speakers