If I'm not mistaken, head turn based on the 2da entry which allows head turning, it not driven by an animation cycle in any file. Instead, the head turns toward wherever the nearest look target is, which cannot be hard coded, because it needs to be dynamic.
The node which turns is defined in the nearby head column in the same 2da. I believe that is appearance.2da. Head turn and head node should be near the end of the row.