Can you look on the radiator and see if you have a " fan " module .
Yes it is . But for some reason in the diagram it shows it tied in to the relay . It doesn't make sense to me . Have a look at this diagram for the pressure switch . Also have a look at the relay diagram . Try unplugging the relays 1 at a time so we can determine which one is being commanded " on "
I am sorry . I read your original post wrong . I thought it was staying on all the time . Have you had your radiator checked ? Are you sure that you have filled the cooling system fully and bleed the air out of it ?
The fact that the fans turn on tells you the ECM circuit is working . Take the ECT out of the engine , plug it in get a really boiling hot pot of water and lower the sensor in to see if it turns the fans on . ( make sure the key is on )
Fill the cooling system and open the bleed valve run the engine until there are no bubbles coming out ( straight coolant ) .