1st post on the forum. 2005 LS with 88,000 miles. Car is about as perfect as it can be for being black and an '05. But my Defrost plenum has stopped working and I cannot get the DATC Self Test to work. I hit the Off and Defrost then Auto and nothing hapens. I have been looking here and need some guidance: http://deneau.info/ls/s6x~us~en~file=s6xc0003.htm~gen~ref.htm#PS2-A Any help would be appreciated. Thanks! and look forward to learning more from the forum.