Anyone here encountered this problem??
 

Installed my Pioneer DEX P99rs head unit about 2 months ago. Yesterday was the first time I drove the car at night since then (nice weather here in Pa for January) I noticed that my climate control backlighting was not working. The controls work properly, Just no backlighting. I know I did not hook up the illumination wiring to my head unit, but I cant see that that would be related to the climate control issue.
I know there are a few smart guys out here, thought one may have seen this before and could reply before I go tearing the dash out of the car to troubleshoot. Thanks for any help in advance.
Ron

As far as I know, there is no illumination lead running from the head unit to the ac controls... they should have their own feed. Could the bulb have burnt out? My Mazda had several cluster lights go out over the years.

make sure you reconnected ALL the plugs, more offten then not it's that simple.

There is only one plug to the AC controls.

I suppose the bulb burning out could be the issue, Just not expected in a car thats 5 months old.
I guess I'm taking the dash out again.

Did you ever fix that issue? My controls don't light up either.