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Confirm the black wire to the fan OHM tests good to ground.
Confirm both fan fuses are good and have power.
Confirm both fan relays are getting power on pins at each.
At one relay and then the next jump a wire from pin 30 to 87 to confirm you get low speed and high speed fan.
If all have passed that leaves the wiring from the relays to the PCM or the PCM to blame.
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