The PCM is ulitamtely what controls the fans, but the engine coolant temp. sensor does also help the fans function. No. 34 in pic. below is the engine coolant temp. (ECT) sensor. The cooling fan relay is actual built into a module, the constant control relay module (CCRM). It is in the left front of the engine compartment but does not look like a relay because again it is a module, relays built inside of it.
Check out the images (Below). Please let us know if you need anything else to get the problem fixed.
Images (Click to make bigger)
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Thursday, November 4th, 2010 AT 8:58 PM