A one-dimensional driven two-species model with parallel sublattice update and
open boundaries is considered. Although the microscopic many-body dynamics is symmetric
with respect to the two species and interactions are short-ranged, there is a region in parameter
space with broken symmetry in the steady state. The sublattice update is deterministic in the
bulk and allows for a detailed analysis of the relaxation dynamics, so that symmetry breaking
can be shown to be the result of an amplification mechanism of fluctuations. In contrast to
previously considered models, this leads to a proof for spontaneous symmetry breaking which
is valid throughout the whole region in parameter space with a symmetry broken steady state
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