Okay to leave key in and lock door? - Mazda CX3 Forum
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post #1 of 18 Old 09-02-2016, 08:54 PM Thread Starter
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Okay to leave key in and lock door?

I have already tried this, but want to make sure there isn't a gotcha I missed.

I am going kayaking and don't want to take my key with me; presumably they don't do well with water. Any reason I can't stash the electronic key inside and take a door key with me to lock/unlock the door?

Seems to work, but who knows.
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post #2 of 18 Old 09-02-2016, 09:47 PM
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Have you tried it? I can imagine leaving the electronic fob in the car and locking with the physical key, but, since the electronic fob is actually inside the car, can you unlock it by pressing the button on the door handle? My suggestion - a zip lock bag or any other container designed to contain your water non-resistant devices (phones, et all).

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post #3 of 18 Old 09-02-2016, 10:02 PM Thread Starter
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can you unlock it by pressing the button on the door handle
The door button doesn't do anything with the electronic key inside.
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post #4 of 18 Old 09-02-2016, 11:09 PM
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Cool - I did not know that! No worries then.

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post #5 of 18 Old 09-03-2016, 01:15 AM
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As long as the key fob (transmitter portion) is in the car, the car will not lock unless you use another FOB. This is to prevent you from getting locked out by accident. Be aware that while the key is in the car make sure that the lights are off and that you have a jumper in the car as the FOB is continuously talking with the car so it may drain either your fob battery or car battery. Its rare but it has happened.

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post #6 of 18 Old 09-03-2016, 02:29 AM
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I have already tried this, but want to make sure there isn't a gotcha I missed.

I am going kayaking and don't want to take my key with me; presumably they don't do well with water. Any reason I can't stash the electronic key inside and take a door key with me to lock/unlock the door?

Seems to work, but who knows.
A fix for you fob storage is to buy one of those bags with metal built into the walls or, just use a metal tin (with lid) to block the signal from the fob.

Just for interest: I bought a wallet with metal screening build into the walls (Faraday cage) to stop my credit card from being scanned. Don't know what these credit cards are called in other parts of the world (called swipe card here) but they are used to "swipe" in your card info instead of keying in numbers. I believe two such cards in the same wallet cancel each other so they cannot be scanned. Anyone want to comment?

You only have the right of way if the other driver gives it to you

Last edited by Levi3xt; 09-03-2016 at 04:04 AM.
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post #7 of 18 Old 09-03-2016, 06:39 AM
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I think it's asking for trouble. Can't get duelling banjos out of my head and in any case, I can't lock mine with the key in.

Currently CX5 SportNav 2.2 diesel automatic and AWD.
Formerly CX3 SportNav 1.5 diesel automatic and AWD.

All advice is given in good spirit and taken entirely at the readers own risk. WORK SAFELY. ©2018 anchorman

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post #8 of 18 Old 09-03-2016, 11:00 AM
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I think it's asking for trouble. Can't get duelling banjos out of my head and in any case, I can't lock mine with the key in.
This is getting interesting. I went to my car with fob in hand and locked/unlocked the door (as you would expect), I then removed the key from the fob, put the fob on the drivers seat shut the door and was able to lock/unlock the door (with me on the outside).

I then got a metal tin with a metal lid put the fob inside the tin sat in the drivers seat and tried to turn on the ignition. Nothing happened. Took the fob out of the tin, ignition worked as expected. Repeated the fob in tin again and, again I couldn't turn on the ignition.

Could I ask a few others to try doing what anchorman and I did to see if their systems work differently from ours.

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post #9 of 18 Old 09-03-2016, 02:21 PM Thread Starter
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Could I ask a few others to try doing what anchorman and I did to see if their systems work differently from ours.
Aluminum foil is adequate.

But back to the issue of running down batteries... So a few hours is okay, but a week at airport parking is a bad idea?
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post #10 of 18 Old 09-03-2016, 02:33 PM
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I don't think you'd run the car battery down by doing that but it is a fact that they talk to each other while within a few yards. For that reason you shouldn't hang your keys on the inside of the wall next to where your car is parked. On a Toyota, the key and car will shut down after 30 days and the car can only be opened with the remote after that. I'll have to read up to see if the mazda is the same.

Currently CX5 SportNav 2.2 diesel automatic and AWD.
Formerly CX3 SportNav 1.5 diesel automatic and AWD.

All advice is given in good spirit and taken entirely at the readers own risk. WORK SAFELY. ©2018 anchorman

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