ldam

2006 lexus es330 climate control backlight wont turn on, I recently change the headunit, however even when i put back factory headunit backlight on headunit and climate control won't turn on, as well as the light in the ash tray wont turn on, the cigarette power still work, I check all the fuse replace any that burn. still can't seem to figure out why it won't turn on. when i turn off the headlight the LCD on the climate control will turn on. It's seem to be the opposite than what it's supposed to do, I look everywhere can't seem to find the answer