  $SU(2)_L$ doublet Higgs fields are unified with gauge fields in the $U(3)_s
\times U(3)_w$ model of Antoniadis, Benakli and Quir\'{o}s' on the orbifold
$M^4 \times (T^2/Z_2)$. The effective potential for the Higgs fields (the
Wilson line phases) is evaluated. The electroweak symmetry is dynamically
broken to $U(1)_{EM}$ by the Hosotani mechanism. There appear light Higgs
particles. There is a phase transition as the moduli parameter of the complex
structure of $T^2$ is varied.
