need to remove the amplifier on the lx 470

It is located under the passengers front seat. Move seat all the way up, remove plastic covers at base of seat. There is a bolt under each side. Also remove plastic cover for under seat. Has two plastic clips that easily come off. There is one screw securing the back side of the amp, remove it. Then go to the front and slide seat all the way back. After this disconnect the battery. Once again, remove plastic covers to seat bolts on each side. Then lean seat all the way back. No need to take seat out. Disconnect one bolt for ground wire. Then remove bolt for front mounting bracket. Amp will slide toward center console and come out. Disconnect wires on back of amp. The mounting brackets are secured to the amp. Do not try to remove with a phillips head screw driver. They strip extremely easily. Use socket wrench. Place brackets in same position on replacement amp. Follow all instructions in reverse to reassemble.

Right under the seat is the computer navigation part. Is the amplifier on the side of the seat closer to the passenger door?

I have Lexus LX470 with no sound radio turn on the display show station but no sound any idea what could be? . Thank you.