As I recall, the Genesis 3.2 needs an audio input from the tV in order to play over the air antenna sound from the TV, through the surround system.
The Genesis has 3 ways to get audio from your TV...standard RCA calbes from the TV audio output jacks (red & white) wired to either jacks AU1 or AU2 on the radio. The third way is via a digital audio cable (oprical toslink or coax spdif) to the Single digital jack on the radio. These wiring options are shown on Herks post #2 in the linked thread or on page 34 of your manual. There was a thread on this a few weeks back with some good pix and explanations which you should find helpful here: Surround sound from genesis unit
Enough people have found no connections or wrong connections from the factory on this that it is worth NOT assuming something is broken. More likely a connection issue or set up menu selection issue.