a/c fan and headlights

I have a 1998 Grand Prix. For some time now, the headlights work fine when the a/c fan selector knob is in the "off"or "5" position, but at any other speed the fan does not work and the headlights shut off???? I can hear a relay for the headlights click off under the dashboard... I have checked all the related fuses, but no luck there. Does anyone have an idea of what may be causing this issue. Also, just within the last week the dashboard lights do not come on automatically or when the headlight switch is turned on... could this be related? The fuses are all good and the dimmer switch still operates the radio backlights... any help would be greatly appreciated. :banghead:

I had this problem also. Check this forum out.
http://www.automotiveforums.com/t271705.html