Climate Control Display Intermitent lighhting

In my 97 Riv, the climate control display illuminates intermitently. IE the temperature, and the whole climate display will come on for a while and then get dimmer and dimmer and then no display and then it will come on for a while. There is no pattern and I don't think it's related to outside temperature. Any ideas what the problem might be? Is there a control module for the display unit?:banghead:

Thanks,
Randall in Alberta