Programing the aux fan turn on for a 98 Chevy

[1998chevy1500]

Hey everyone,

Not sure if this is the right forum but here it is anyway.

I am looking at putting in a set of electric fans into my truck and as such I would also like to wire them to operate directly off the truck computer if possible. After looking at the TunerCat tables there is a set of constants that seem to be related to Aux Fans. I am wondering if anyone on here knows what pin in the computer harness controls the aux fan, and how one would go about activateing this pin to work.

Here is a screen shot of the constanst that I am talking about. Found in Constants--> System Parameters.



Also here is a diagram of what I want to do for my wireing. The pin shown is for a NBS (99+) engine computer so I'm sure the pin is different.



Thankx for the help,

Conrad

[1998chevy1500]

Also a few more questions that I have.

How would I verify that I have selected the correct pin without risking toasting the PCM?
Does anyone know if the pin will ground or go high(12v) when the fan is activated?
What about when the fan is off, is it the opposite as on or is it floating?
I was thinking about useing a DMM and probeing the pin with one lead and hooking to 12v with the other, then reprogram the turn on to be really low and then warm my truck up and see what the pin does.
Does the pin have to be "activated" in some way by dealer programing or does it automatically work?
Does anyone know the max amperage draw the pin would be capable of? Enough for a relay? Would I need some form of solid-state circuitry instead?

Thankx
Conrad

[1998chevy1500]

Anybody??????

[gearheadnate]

I know that the PCM usualy control gounds. All my buddy with that body style truck just put a fan switch in the head out of a 92 vette.