Quote:
Originally Posted by 6spdg37s
I did command it with my scanner but it's possible there is a short somewhere
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I'm not sure what you mean by short. If the scanner makes it work, that means the circuit from the pcm to the relays, to the respective powers and grounds are good. The inputs to the pcm are most likely your issue, you are bypassing them and commanding the fans manually instead of the pcm processing the data and commanding them normally.
This is assuming you commanded both low and high speed fans, had no jumper wires etc, and everything worked when you asked it to.