Altima overheating
 

Hey,
Looking for some electrical help. The cooling fans on my 1999 Altima won't come on, even with the A/C on. I have checked the fuses and swapped the relays with no success. Does the ECM supply voltage directly to the relays? Does the ECM get its signal from the same sensor as for the gauge? The gauge is operating normally.
Thanks, Russ