Ferrari 550 Wiring Diagram Confusion

It's somewhat incomplete. The HVAC system controls the radiators with a backup from the RH ECU (which turns on both fans simultaneously). I don't have full wiring for the HVAC system, just to plug 275 near the evaporator.

https://www.dropbox.com/t/pwSF9KjmiNzLZVd5

See 9A and 12A for the fans.

The RH fan can be controlled by the HVAC ECU via relay "H" or the emergency relay "A". Not sure what signals the HVAC ECU is using.
The LH fan can be controlled by relay "R" or the emergency relay "A" (via "R") via connector 275 (pin 16).

The LH Bank coolant temperature sensor sends a signal to the HVAC system (pin 18 of plug 275).
The aircon gas 15 bar pressure switch on the receiver dryer also send signals to the HVAC ECU (via plug 275 pin 17)

The relay panel is shown flipped. Use the graphic above the fusebox schematic for actual relay location.

 

Connector 275 is just above the carpet line:

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i.e. the white plug near the HVAC fuses