[fuzzypuppy]

I remeber see'ing several post's awhile back where the digital control heads went bad, do your control's still light up and give the appearance of working?
If not the control unit in the dash needs replaced, "usually".
For verification of this, once you have the head unit out check for power at the connector with a test light or multieter, if you have power at the connector the head unit is bad.
Hope this helps.