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Actually, you might be right with your initial guess.
The cruise control computer turns off when you turn the switch off.
The Zexel aircon unit doesn't.
Now, I'm just guessing at this point... but remember you can hit the "Outside Temperature" button when the Zexel unit is "off" and it will still display the temperature and beep as it should. To be able to do this, the computer would have to be on, would it not?
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