Radio help

sometimes depending on if it is a 4 door or 2 door the amp can also be just above the gas pedal next to the door lock relays

its a 4door. I found a small silver box under the drivers seat and found nothing but ac stuff behind the glovebox. I check the wireing harness again and it seems to be in perfect working order...and if what I have found is the amp how to I bypass it.

small silver box under driver seat? make sure it isnt the airbag sensor..

could be a grounded speaker wire