Both relays you describe are relative to the secondary fan.
One allows the fan to come on when the AC is turned on, the other works in conjunction with the temperature probe that (should be) mounted to the left side of your radiator shroud which detects when the temps comoing off the radiator are too hot and engages the auxillary fan. (which will run after you shut down the engine and automatically turn the fan off once the senosr gets cool enough)
I'm 'pretty' sure there's a diagram in this section or the elecronics subsection.
However, if not, papajam may have something covering that circut that he may offer up if you PM him about it.
One allows the fan to come on when the AC is turned on, the other works in conjunction with the temperature probe that (should be) mounted to the left side of your radiator shroud which detects when the temps comoing off the radiator are too hot and engages the auxillary fan. (which will run after you shut down the engine and automatically turn the fan off once the senosr gets cool enough)
I'm 'pretty' sure there's a diagram in this section or the elecronics subsection.
However, if not, papajam may have something covering that circut that he may offer up if you PM him about it.