Good used working.  This Is the control module for the Cadillac cars has the front De-ice feature - quite rare.  This describes this system here- https://www.delcoremyhistory.com/Products/heatedwindshield.htm?fbclid=IwAR0n003GW79pxpQfW9MM-sF4I33gb8nTDONow-E7oCS05BmdtadqPVwyOW8