2003 lexus es300 audio fault codes

What is your question?

hi. i attempted to change my head unit in my car. I unhooked the factory pioneer 6disc changer unit and installed the factory NAV unit for car. The new unit did not power on, so I replaced the original head unit. Now there is no sound coming through speakers. It has power and functions as it should except no sound. I checked all fuses but seems like its the amp. i went into diagnostics mode and get p190 chec p440 chec n04a what are these codes referring to? I cannot find a code list anywhere!