Where do I connect the AMP-CON wire?

I don't have any aftermarket amps or subs but my car does have a factory amplifier under the driver seat. Currently there is no sound at all. Could this be because of the AMP-CON wire?

Also the steering wheel controls are not working. I have the KEY 1 and KEY 2 wires connected but there is an aux cord that needs to go to the yellow, white and red RCA wires (I think) (they're labelled AUX-V-IN, AUX-L-IN and AUX-R-IN). If so I think I just need an adapter for that.

Hi,

 

Regularly covered topic. Disconnect the battery for at least 30 minutes. It should reset the amp to activate on the ignition giving you sound once more.