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If there was no power enabling a receiver of some sort, how would that receiver ever get turned on? And there has to be some power to enable the immobilizer to send the signal to turn on the circuitry to unlock the car.
Yes key fobs of different model years work differently, but the basic principle of needing a listener is still the factor.
Big power drain, no. But there is a very small drain even an hour after you have turned off the car and walked away from it. If there wasn't, you'd have to always use a mechanical key which doesn't require that listener to unlock. Not something that a healthy battery can't handle in normal situations. But a car left long enough ...
Why else do we get battery drain and condition questions after winter hibernation season ends?
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Prior '70 914, '99 986 Boxster, '01 Boxster S
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