Technical Stereo wires

[Pu14oGT]

Hi, everyone. I'm putting in a new head unit in my GT, the old one very badly put in. Anyway, based on the old head unit I know what thick wires are for, but I have no clue what are the 4 thin ones for. Does anyone know?

Thick wires
Orange/black Speaker LR+
Red/black Speaker LR-
Blue Speaker RF+
Blue/yellow Speaker RF-
Pink/black Speaker RR+
Orange/green Speaker RR-
White/black Speaker LF+
Violet/black Speaker LF-
Red +12V
Black Ground

Thin wires
Gray ???
Black ???
Yellow/black ???
Red/black ???

 

[Pu14oGT]

Nobody?
I was just wondering which one is for ignition switch and what are the others for.