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Be careful with this. I used my wife's Key Fob (of course) to try this. It did in fact shut the Key Fob OFF. But no manner of Button Presses or Button Press Combinations would bring it back to life. But Note: First, The Lock and Unlock button press commands worked just fine before I did this.Second, I was NOT getting a Low Battery Warning from the car before this and Third, Although the Key Fob was already OFF (or at least it wasn't working) repeating the Key Fob OFF function by pressing both the Lock and the Unlock buttons at the same time again, reliably generated the red flash illumination of the Key Fob Porsche Crest. So it was basically generating a redundant Key OFF command, or at least it looked that way.
So I tried removing and replacing the Battery. Essentially doing a Hard Reset. That didn't work either.
What did work was to replace the Battery with a new one.
It would seem that if/when the battery is near to, but hasn't reached the official Porsche "Low Battery" level . . . . it will still work just fine. But shut the Key Fob OFF and there's not enough left in the Battery to reboot the Key Fob. So-o-o-o-o-o-o I'd probably not do this, turning the Key Fob OFF, if I didn't have easy access to a new replacement battery.
Last edited by Bluehighways; 02-08-2024 at 05:28 AM.
Good catch @Bluehighways . My question though is even if you disable the FOB end of the "ping" the car will still be pinging or searching or looking out for nearby FOBs no? Unless pressing both Lock/Unlock disables both but I doubt that and the most important one to protect is the car battery not the FOB one.
Good catch @Bluehighways . My question though is even if you disable the FOB end of the "ping" the car will still be pinging or searching or looking out for nearby FOBs no? Unless pressing both Lock/Unlock disables both but I doubt that and the most important one to protect is the car battery not the FOB one.
siberian
First, Turning a Key Fob OFF does NOT turn the Key Fob systems electronics of the car from searching for, or being receptive to a Key Fob signal. I know this because when I had turned my Wife's Key Fob OFF (which I did standing next to the car), my Key Fob (as opposed to my Wife's Key Fob) remained active and the car responded correctly to all signals generated by my Key Fob.
Second, The parasitic draw of the car, on the car's primary battery, includes the draw of the Key Fob system on the car's battery. If this were not so, after some elapsed period of time, the programing logic of the car's Key Fob system would turn it completely off. This would/could be done in a similar fashion to the RAP (Retained Accessory Power) logic that our 992 911's do have. I do know that if I do not drive my 992 for an extended period of time (1 week +) that while the cars Key Fob system will become unresponsive to a "Lock" signal from the Key Fob, it does remain responsive to an "Un-Lock" signal, I know this becuase it has happend to me on the rare occasions that my 992 sits for more than a week without being interacted with. So the cars Key Fob system is awake, but it is programed to treat the "Lock" and "Un-Lock" Key Fob signals differently, after some period of time has elapsed.
Summary: 1.) Since the car's Key Fob system does not automatically shut off completely with or in a similar fashion to existing RAP logic, I would imagine that the addition of the cars Key Fob systems parasitic load, to the total pre-Key Fob systems parasitic load, was considered acceptable/minimal during the design of the vehicle. Traditionally this parasitic load limit (for diagnostic purposes) has been 35 milliamperes and assumes that the car will not be left turned off for more than 30 days. 2.) Turning the Key Fob OFF, is effectively the same as placing the Key Fob in a Faraday Cage or typically the owner simply keeps the Key Fob out of the range of the car's Key Fob system. The presence or the absence of a Key Fob or whether it is ON or OFF, does not change the parasitic load the cars portion of the Key Fob system places on the cars battery.
Last edited by Bluehighways; 02-08-2024 at 01:29 PM.
But the main concern is the car's battery not the FOB's IMHO. I thought someone opined that the FOB battery as being an issue and ensuring that battery was always good by turning OFF the FOB.
In that case you would have to use the physical key to open the door rather than remotely by pressing the FOB.
siberian
Sorry by keyless I just meant proximity / touching the door handle. The FOB buttons would still work / be the only way to unlock the doors without triggering the alarm.
If the FOB still works then there's still some bilateral (FOB and car) battery drain.
siberian
True, but in my experience they are different radios. So turning off the proximity transceiver should still net some power savings, plus more security from relay attacks.
But the main concern is the car's battery not the FOB's IMHO. I thought someone opined that the FOB battery as being an issue and ensuring that battery was always good by turning OFF the FOB.
siberian
Nah, the only battery that you're saving by turning the Key Fob OFF is the Key Fob's battery.
Turning the Key Fob OFF doesn't stop the car's system from continuously looking for it.
Sorry if my Anthropomorphism is rendering this subject more confusing than it needs to be.
02-08-2024, 05:22 AM
