i have an lx 4cyl single zone AC. everything works fine, just the modes wont switch.Do you have Single Zone AC, or Dual Zone Auto Climate Control? Sounds like you bought the wrong head unit that did not match your climate control. Or, the stereo you bought has a faulty HVAC control board.
lx. my original one was 2AC0, the one i bought was 2AA1. does that make a difference? thanksWhat year model car do you have? DX/LX/SE/EX/etc, and what faceplate did you buy?
If you got a a mismatched zone control, you could plug it in, but it wouldn't function properly as you're noting, but if it's the same (single/Dual) that you have now, I'd vote that it's faulty, too. But I'd still be curious where your mismatch is and if it would be something suspiciously different that might cause that issue.