Source google image: http://3.bp.blogspot.com/-W-yZ7hJ4TDY/UoZOscipU0I/AAAAAAAAAuU/6_qHbJqneh4/s1600/unidad+direcci%C3%B3n.JPG
Schema electrique 107
Source google image: http://3.bp.blogspot.com/-W-yZ7hJ4TDY/UoZOscipU0I/AAAAAAAAAuU/6_qHbJqneh4/s1600/unidad+direcci%C3%B3n.JPG