bypass factory stock amp

I need to bypass the oem amp in my whip 2013 toyota avalon ive spent the last 4 hours trying to find the location online because i dont want to just tear my car apart to find it. Pmease can someone either shoot me advice or a pic of its mysterious location. Thank you its making me go crazy think...

I have a 2003 Hyundai Tiburon GT with the Infinity Sound System. Originally, my speakers had no sound coming out of them. I thought it was because of a faulty stock head unit. Then, I installed my aftermarked Pioneer AVH-P3100DVD head unit--still no sound. Now, there are two things that could be...