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Looks like I will be bringing home a 16.

Will having the second key somewhere in my luggage prevent the locks from working?
 

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You will get a dreaded triple honk every time you leave the vehicle, but the car will not unlock or to let someone drive away. It will however (I discovered this while putting my luggage in the back at the airport) unlock the driver door automatically if you walk up the the car, open the hatch put your luggage with keys in it into the hatch, then close the hatch. Nice that it helped prevent me from a short panic until I realized that I still had my smartphone and could remote unlock if that unlock feature wasn't there. I think it needs to sense both keys inside the car before it will unlock, but I didn't thouroughly test this out.
 

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Man I hate the triple beep
+1, happens when my wife has her fob in her purse and I park and get out, that triple honk can take you by surprise and is LOUD.
 

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Remove the battery or isolate RF. Aluminum foil may work as a tiny faraday cage.
 

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Remove the battery or isolate RF. Aluminum foil may work as a tiny faraday cage.
I don't bring a second key. There is of course some chance that you will lose your key, or damage it i suppose, but in the more likely event that you lock they keys in the hatch or wherever, you can use the OnStar app on your phone to command the doors unlocked.
 

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+1, happens when my wife has her fob in her purse and I park and get out, that triple honk can take you by surprise and is LOUD.
You can turn off the triple honk for the situation of leaving a keyfob in the car. However, if you leave it running, it will triple honk regardless of where the keyfob location when you exit the car and close the door.
 
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