If this is not a base model, then it may be :
1. no power to the head unit. Remove head unit and check for power at the connector.
( I am assuming this is the primary, cause you didn't say the head unit lights up but makes no sound - IIRC there is also a fuse on the back )
2. no power to the amplifier. Access the amp below the passenger footwell and check for power.
( schematics are in the online service manuals )

If it is a base model, then there is no amplifier.