Quote:
Originally Posted by sweetbmxrider
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.
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So when I commanded them on they went on.
Now I found a jumper wire someone had run (previous owner I assume) from the pin on relay 1 to mid wire harness ... Why I'm not sure but assuming maybe they had an issue with input from pcm at some point ?
I need to play with it when it's in front of me don't have it with me right now