Radiator fans not working when A/C is turned on?

The reason they come on when the A/C is on is that the control module commands them on to blow air over the condenser. This is a different circuit so that just confirms that the fans work and that this is a circuit issue.

What I would do is refer to the wiring diagram below and check voltage from the ECM and coolant fan control switch to the coolant module.

https://www.2carpros.com/articles/how-to-check-wiring

So just go to the module and let the car warm up and then check the voltage on these wires and that will give us a good idea as to what is happening.

I suspect the ECM is the issue but we need to make sure the coolant module is getting the proper voltage from it or we will just be guessing. Thanks