Something has to be looking for the button to be pressed for the unlock sequence be activated. Yes it doesn't proximity sense like more recent car designs.
Communications requires me listening to see if you are talking. If I am not listening, then you talk to no effect. But if I am, I can answer with the appropriate action. Or the way my wife wants....
To listen, some electricity is used... by a circuit called immobilizer/central locking. 6.5 mAmps after an hour.
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Prior '70 914, '99 986 Boxster, '01 Boxster S
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