What could be the problem in a Lexus sc400 when a heater ac unit lights up but none of the buttons work and nothing displays on the screen?
My friend had the same problem with his sc400. Says it's usually
a relay located not too far away from your left foot when your
driving. Sry about not being too specific but it should be a good
place to start..
I had this happen in my SC300. Check your fuses including A/C
AND cigarette lighter fuse.