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When the ECM determines it is time to activate the fans it puts a ground on Pin 2. This activates the fan relay which turns the fans on.
As a manual bypass you could install a on off switch, connect one end to the wire that pin 2 was supposed to accept and the other end of the switch to ground. Then when you felt the need to activate the fans simply throw the switch.
 
My philosophy is if it's broken then try to fix it. If you fail then at least you have learned something and then buy a replacement. Who knows, you might successfully repair it.
 
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