1 - 2 Front Right
3 - 4 Rear Right
5 - 6 Rear Left
7 - 8 Front Left
11 Ignition on
12 Permanent 12V
14 Ground

There's an antenna and phone mute in there somewhere but I've not found them yet and I don't need them so I'm in no hurry.
I will hopefully soon check the output polarity on pins 1-8 because they invert between each output on the chips but I expect the inputs are also invertedbut till we check with a signal generator we can't know. None of this is documented.