Not on any known vehicle that I am aware of. It is a safety thing. They don't want to be sued because the car shutdown in an intersection or something of that nature.
Mine beeps and says "Key" in red at me if the key signal is lost but runs until I turn if off. I have never had to use the backup though as mine has a battery life indicator / signal is weak light in the dash for the fob. When I turn it off, if the "Key" is blinking green for a couple of minutes -> battery is low and should be replaced. Blinking red "Key" -> too late, use the back up.
Friends Caddy has a slot inside the center console that the fob fits in to do the same thing.
I have two toyotas, although I have never tried, but I am pretty sure that if I start the car, roll down the window, throw out the key and keep driving, the car will not go too far, I think it will go only for a mile or two. OP's situation is pretty much the same, as the battery ran out, it cannot transmit the signal anymore, however, if he holds the key close to the button, then it will start the car, but once the key is removed away from the button, the car will not know that the key is still in the car.
I rest my case.
My Prius has a fob slot.
BTW you can still open the door with just the fob even if it has a dead battery. Why? Cuz there is actually a physical key inside the fob. The problem is if you haven't read the manual, you may not know that.
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lol i had to do the same thing about a year ago. turns out, there is a slot down below the bottom left of my steering wheel where you plug the whole fob into and it acts as though it's a normal key.
not my car, but it's in the same place on my g37s.
http://ww2.justanswer.com/uploads/FI/FixUrNissan/2013-07-15_141413_m35_fob_slot.jpg
Old way better!
I have two toyotas, although I have never tried, but I am pretty sure that if I start the car, roll down the window, throw out the key and keep driving, the car will not go too far, I think it will go only for a mile or two. OP's situation is pretty much the same, as the battery ran out, it cannot transmit the signal anymore, however, if he holds the key close to the button, then it will start the car, but once the key is removed away from the button, the car will not know that the key is still in the car.
I rest my case.
meh...I had to google "how long to boil eggs"
It happens
Here's also what happens
Someone looks up how long to boil eggs and they see, let's say, 12 minutes. They then double check "boiling eggs 12 minutes" and get a bunch of hits. Confirmed, and now if someone says "I boil eggs for 11 minutes, the "expert" yells "you effing moron, you don't know anything. Everyone knows you boil eggs for 12 minutes.
