When I bought my car, these were already here.
They were hidden under the mat of the trunk and squeezed by the rear seats.
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What's each wire/cable for?

Thank you!!!

 

Please post threads in the appropriate forum. That being said I'm moving this to where it belongs ummmkay?

 

please do

 

Those are for an amp.

Black - Ground
Blue - Power (check it's the same on the battery end with a fuse)
Little blue - Switched Live (Ignition on) Signal for power on (from stereo)
Black/Silver - RCA from stereo for audio signal
Aux - not sure, could be for signal or possibly a volume control (subwoofer control) or other

 

I would also add that the Black (ground) and Blue (Batter +) should avoid touching at all costs. It seems likely that the fuse was removed at the battery on the Blue wire, but you don't want that live wire shorting out anywhere on the chassis and starting a fire.