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I don't believe that's the way it works on the older systems like on my 98'.
I believe the press of the key FOB's button acts like many remote controls, It turns the system on and THEN the system "looks" for the code to unlock the car. (that's why there is a button on the fOB in the first place)
My Harley Davidson and BMW key FOBs work the exact opposite way. Those FOBs are always trying to communicate, which is why I keep the FOB far away from those vehicles so as to not constantly communicate and wear down the FOB batteries prematurely. They are "PROXIMITY" FOBs, while my 98' Porsche FOB is only a basic radio transmitter that must be activated by pressing in order to begin communicating..
I assume the newer Porsche FOBs are typically "proximity" FOBs like most of the industry so as you get closer to the car the car responds.
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98' Boxster
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