Audio Systems: Car Stereo Install, radio hole, radio location

Question
I have a 1996 toyota windom. I live on the island of okinawa. We are currently trying to install a new stereo into this car but were told that the car has a built in amp we need to wire though. Where is this amp and is there any easier way to do this. My other option is take it to the dealer and they will install for $60.00 USD. What can you help me with?

Answer
Amplifier is inside the dash or under the seat in that case you find a 15 pin plug or 20 pin plug at the radio location

if you find a 6 pin plug and a 10 pin plug there is no amplifier

also you can find all this plugs on the right side of the radio hole space
good luck