My interpretation of the operation of that system is that the compressor clutch is a redundant fail safe which is not even installed on all models. The AC is totally controlled by the module through 2 solenoid controlled valves, One valve is at the evaporator and the other is in the compressor. I can’t imagine that the system can be diagnosed without the factory manual and likely a diagnostic tester dedicated to the system. Toyota seemed to be seeking perfection and perfection comes at a heavy cost.
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