texasscooby

I have a 92 p/u that the digital head control will not work. I swapped this with my 94 p/u and it works in that truck. I checked the power and ground to the unit and everything is fine there. I jumped the blower relays and the blower still works. I swapped the relays and still nothing. Any ideas on why I have power to the unit and no display?

Thanks in advance