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Detail of one of the carbon jet vanes.

The state of the art at the time the V-2's engine was developed did not yet support gimballing; rather, directional jet vanes were placed in the engine's exhaust stream to help steer the missile (along with the external control vanes on the fins).

I believe that each jet vane and corresponding external control vane were controlled by a common drive motor.

Toward the forward end of this jet vane, in the background, is the jet vane located 90 degrees around the missile; that vane is positioned perpendicular to the engine's exit flow.