Quote:
Originally Posted by First c10
So the grounded trinary “Blu” has a diode to the high and low side of the pcm so the fans go to high when the trinary switch see’s pressure? And if the pcm tries to turn on the fans it doesn’t change? Will there be any codes in the pcm as the high and low signal wire will see ground when ac is on and the pcm isn’t calling for fans on? I Ask because I can’t remember what I did.
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The trinary has 2 blue wires and 2 black wires. One blue goes to trigger relays when it see pressure, the other blue wire is grounded on trinary. One black goes to compressor clutch, other black goes to switch/thermostat. So yep, I have it turning on full power so both fans high speed.
If PCM turns on fans those diodes are one way only so it won't back feed into trinary. No change. And it's my understanding the resistors plus diodes keep the PCM from seeing ground and stop codes from being thrown. MDPotter showed me this part so I'm hoping we're correct on this.
FirstC10, does your setup throw codes?