Radiator fan stuck on and on high in ignition and with engine running?

So it sounds like things are okay?

This is the one you put the used fan module in correct? You could try checking the charging system for any excessive AC voltage due to a failed diode in the alternator, its very difficult to say what is causing the fan driver to burn up, besides another fan with the same issue. Are you lacking communications to any modules at all, was this something you were able to trace back to a specific chip in the ECU that's burned up the same way as previously? I remember it being a 1 wire that was driving the fan module with a pulsed signal, that ran through the front module then back out to the fan, I remember the circuit well since we spent so much time on this.

I would also check for water intrusion into any connectors, I understand that's kind of a vague answer, but a connector with corrosion in it will allow current to flow into other circuits located in the same connector due to the pins being so close. I find water intrusion in so many vehicles that cause more than one issue at a time and can be very confusing in the beginning, but once you find it and it's cleaned up, with no more faults it will make sense. If the fan driver is the only circuit effected, I would start inspecting every connector in the circuit, especially female side of the connectors where you can't always see corrosion down inside the pins.
Looking back over the diagrams, one fan had a 4 wire connector, with a Red heavier gauge wire that came from a fuse, a Brown 12 gauge wire that was Ground, then a Black/Violet wire that came from the Right Fuse Box (Fuse 48 7.5Amp) and finally a Brown/Green wire that went to the C1 pin 4 connector of the Right Front Fuse/Relay module, but back out of that module on the MR1 pin 2 connector on a Grey/Blue wire. These were the wiring diagrams that had many variations depending on built data. There was a change from 08/2002 to 09/2002. But if those wire colors are correct at the fan module, it was the Grey/Blue wire that went to the ECU from the Right Front Fuse/Relay module, the circuit passes right through the module for whatever reason.

The other Fan setup had wires that are Brown, Black, Black/Violet, and Yellow/Blue (2nd diagram).
This other fan module had a mosfet in the diagrams with another mosfet located in the ECU diagrams that was control for the fan on the Yellow/Blue wires, I think it was this 2nd design, because the first wasn't controlled at the fan itself, it was a wire that went directly through and was just ground side controlled by the ECU, not switched internally at the Fan module. This is where it was confusing, trying to figure out which system we were working with. I thought you had a picture of a red wire going to the fan at one point.
We started on this vehicle, 12/24/2024 so there are a lot of diagrams pulled for this vehicle.

Is there a built date on the tag either in the driver's door frame, or on another tag? And one last thing, can you post the VIN for this vehicle, some of the 03' diagrams are running into '04 on all data, so we need to look at this by the vin. The fan modules are listed under the same label on each diagram, but the wire colors are different.