ALIGN

It just so happen and made me curious. I tried leaving the key inside the trunk and close the lid. When I tried opening it thinking if it would open or not. We'll guess what, it WON'T open.

Open the trunk again from the drivers trunk release button and played around with it as to why it won't open. With the truck open, I place the smart key in front (by the license plate) and press the trunk release and the hatch activates the trunk release motor. Placing the smart key behind the license plate, the smart key led lights blinks, meaning it acknowledge it but it is behind or inside.

What I didn't test is, having the smart key inside the trunk and tried to lock the car. I'm guessing it will not lock because it doesn't sense the key next to the door. I will try testing this later to see also if I can force the lock from the inside.

Why would the trunk allows you to lock the smart key from the inside. What is Lexus logic for this? What if you turn on the trunk disable button in the glove compartment and left the smart key inside the trunk and then you suddenly left the bag or purse in the truck and close it.

sderman

The manual goes on to say that when this function is set "battery depletion is minimized by stopping the electronic key from receiving radio waves". But I wonder if there a distance beyond which this is unnecessary? The manual suggests/implies it might be about 6 feet but I'm wondering if say at 20 or 30 feet would the battery(ies) still experience some depletion? In other words, is the electronic key always hunting for a signal no matter how far it is from the car?

renegad44

Just recently my wife popped her trunk, got out the car, locked it with the key fob, reached into the trunk for something and at the same time she was closing the trunk, the key fob fell in...needless to say, I had to go and get her, lucky it was only 20 miles....so, I would think locking your car than throwing it in the trunk will get done what you're looking for, minus the metal key of course.

jkaloz

Have you tried to take the battery out of it?

surftwin

FINALLY! I can lock my smart car key fob in the car while I surf. The below nifty little thing is a must for anyone who needs to lock their smart key fob/push to start key!!
https://www.aasurflife.com/product/r...-blocking-bag/

-Simply remove the mechanical key from key fob to bring with you
-Place key fob in the inner gold lining RFID layer of bag
-Leave RFID bag in the locked car, and go surf!
Your vehicle cannot detect the key fob, so it will allow your vehicle to lock!

dchar

Why don't you just deactivate the key (hold lock and press unlock twice and wait for the light to flash 4x) and lock the fob in the glovebox, lock cat with metal key, and take the metal key with you?

lesz

I was thinking the same thing. Why introduce another piece of equipment when just deactivating the fob will accomplish the same thing?

Mike728

It looks like he's advertising it here. First and only post.

mcomer

Would be useful for the former style keyfob that did not have the deactivation feature.
The current fob has square corners and buttons all in a row, the first generation was
a bit rounder and the buttons for trunk release and panic were offset.

Riick

Agreed, Also, keeping the key in a Faraday Cage, or, similarly, wrapped in Foil, in a Copper or Steel, or Unobtanium cylinder, the circuitry will keep trying to send & hear a signal from the car. Net result: Battery Drain.

bc6152

This thread is 5 years old...

lawonga

Can the mechanical key be taken into the water? Going to the waterpark this weekend and I'd like to just lock the fob in the car and take only the mechanical key with me.

DOsepchook

Use the "Electric Key Battery-saving function" to stop the key from receiving or transmitting radio waves. This will allow you to "hide" the key outside of the cabin. When you get back, retrieve the fob and push any button to activate the fob. From the owner's manual "Push the unlock button twice while holding the lock button. Confirm that the electronic key indicator flashes 4 times."
Try this with your car and confirm it works at your home before you try it in a remote location. At the location, set your fob, hide it and then test the doors to confirm that they are locked.
This works on my 2018 ES 350.
Also this will prevent theft from your driveway by the latest frequency scanning devices theft rings are using.

ronkelley

--
I couldn't make the button push method work on my 2015 IS350c. Maybe only the ES?
--

mcomer

Which key fob style does your '15 IS Convertible have? The older rounded style with the
four (4) buttons offset does not have the deactivation cadence.