  We revisit the discrete dark matter model with $A_4$ flavor symmetry
originally introduced by M.Hirsch {\it et.al}. We show that radiative
corrections can lead to non-zero $\theta_{13}$ and non-zero mass for the
lightest neutrino. We find an interesting relation among neutrino mixing
parameters and it indicates the sizable deviation of $s_{23}$ from the maximal
angle $s_{23}^2=1/2$ and the degenerate mass spectrum for neutrinos. Also we
study the possibilities that the right-handed neutrino is a dark matter
candidate. Assuming the thermal freeze-out explains observed dark matter
abundance, TeV-scale right-handed neutrino and flavored scalar bosons are
required. In such a case, flavor symmetry plays an important role for the
suppression of lepton flavor violating processes as well as for the stability
of dark matter. We show that this scenario can be viable against currently
existing constraints from collider, low energy experiments and cosmological
observations.
