I would think you are correct. However, let's confirm this by checking to see if the PCM is grounding the relays.
Let's do this by putting your red meter lead on the battery positive and the black lead on the wire on the PCM for the relay control. Start the engine and when the fan is to come on, the PCM should ground this wire and the meter will show 12 volts. Does that make sense?
https://www.2carpros.com/articles/how-to-check-wiring
Below is a wiring diagram for this. If the PCM does not ground the relay to turn the fan on then the PCM is the issue.
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Monday, March 15th, 2021 AT 12:36 PM