steering mechanism(n = noun.artifact) steering system - a mechanism by which something is steered (especially a motor vehicle);
is a kind of mechanism
has parts: steering gear, steering linkage, steering wheel, wheel
has particulars: helm, power-assisted steering, power steering, rudder

action mechanism, biochemical mechanism, chemical mechanism, defence mechanism, defense mechanism, escape mechanism, firing mechanism, gear mechanism, irreversible steering gear, mechanism, mechanism of action, power steering, power-assisted steering, rotating mechanism, steering, steering committee, steering gear, steering linkage, steering system, steering wheel, transmission mechanism