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Thread: So what happens if...

  1. #16
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    Quote Originally Posted by shaendra View Post
    OK thanks. That's what I was wondering - still not clear on how the fob is triggered except through some kind of request from the ignition and doors (but then, wouldn't it need to be listening?).
    The fob responds to two kinds of signals. RF and magnetic. RF is used when exchanging code info to unlock doors or start the car. Magnetic is used as a proximity detection.

  2. #17
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    Quote Originally Posted by craigo View Post
    The fob responds to two kinds of signals. RF and magnetic. RF is used when exchanging code info to unlock doors or start the car. Magnetic is used as a proximity detection.
    Probably best to keep it away from a wallet/CCs, then!

  3. #18
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    Hyundai has a good system description of how it works: http://www.hsguide.net/description_a...ation-515.html

    This is a typical smart key system.

  4. #19
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    No worries. The fob only emits RF. It wakes up to low frequency magnetic fields. This keeps its activity range close to the car.

  5. #20
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    As an aside, check that both your mechanical keys work on your car. I decided to test mine, and one was clearly not for my car! (dealer made a new key, no questions asked).

  6. #21
    Registered Member ddtigger1's Avatar

    2016.5 Mazda CX 5 Grand Touring W/ Tech PKG

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    This was done on YouTube... it will run until you turn off the car. Then obviously it will not restart...

  7. #22
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    For us, the big PITA with keyless is that my wife constantly leaves hers in her bag which she will occasionally leave in the car when we run errands - and then I can't get the car to lock - until she digs it out. The worst was when it first happened. I had picked her up at the airport, she had left the fob in one of her suitcases, we had to run to my in-laws for an emergency, so she stayed there with them and one of her suitcases, while my daughter and i made the 200+ km trip back to our house. Of course I had the other suitcase in the car with the fob. I thought the system was broken until we figured out that she'd left it in the suitcase that I had. Thankfully Japan is generally safe enough that my kid and I were able to leave the car unlocked at the rest areas.

  8. #23
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    Quote Originally Posted by shaendra View Post
    You're driving and toss your fob out the window?
    In some areas littering carries up to a $10,000 fine.

  9. #24
    Registered Member Conrad 16.5's Avatar

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    Quote Originally Posted by shaendra View Post
    Isn't it kind of impossible to lock the car without the fob? I've been in a keyless ignition vehicle TWICE, so I am totally ignorant of this stuff.
    With our CX-5 the doors can be locked without the fob by using one of the two methods of locking the car from the inside. Either the electronic lock button that locks all the doors at once or the manual lock that only locks one door at a time. Lock the door(s) using one of those methods and then close the door.

    I found this out yesterday. If a fob is left inside of the car (inside my wife's purse for example and I have mine in my pocket) and I use the inside electronic switch to lock all the doors (they do lock) then close the door. All of the doors unlock at once and I get a series of warning beeps. Now, if I do the exact same thing but I use the lock button on the outside door handle. I still get the series of warning beeps but all the doors lock. The manual explains this but it makes no sense to me.
    "Don't bother me with facts, Son. I've already made up my mind." -Foghorn Leghorn

  10. #25
    Registered Member Conrad 16.5's Avatar

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    Quote Originally Posted by craigo View Post
    The fob responds to two kinds of signals. RF and magnetic. RF is used when exchanging code info to unlock doors or start the car. Magnetic is used as a proximity detection.
    Are you sure that it's magnetic and not short range RFID?
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  11. #26
    Registered Member yrwei52's Avatar
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    Arrow So what happens if...

    Quote Originally Posted by Conrad 16.5 View Post
    Are you sure that it's magnetic and not short range RFID?
    I agree with you. It should be short range RFID, not magnetic.

  12. #27
    Registered Member 7eregrine's Avatar

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    Quote Originally Posted by Mattyredsox View Post
    Thankfully Japan is generally safe enough that my kid and I were able to leave the car unlocked at the rest areas.
    There aren't a whole lot of thieves roaming rest areas in the US either.

  13. #28
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    Quote Originally Posted by Conrad 16.5 View Post
    Are you sure that it's magnetic and not short range RFID?
    For communication with the SMART KEY FOB, SMK ECU generates a request (challenge) as an encoded and modulated 125 kHz signal at the inductive antenna outputs and receives the SMART KEY FOB’s response via the external RF receiver.

    The LF antenna amplifier/driver generates a 125 kHz sinusoidal carrier signal which is distributed to the different antennas.

    This document describes the LF as magnetic: http://www.atmel.com/Images/Article_...rivers-Key.pdf Presumably this is good for security as magnetic fields fall off quickly.

    Of course, implementations may vary.

  14. #29
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    Any thoughts on the reprogramming of a 2016 Mazda3 keyless fob to a 2017 CX-5? (Obviously the key won't work, and assuming they didn't do a redesign on the push button start mechanism) When I lost my car I kept one of the fobs for sentimental reasons. It would be nice if I could use the fob as a third.

  15. #30
    Registered Member 7eregrine's Avatar

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    I would assume that would work?!?

    Sent from my XT1585 using Tapatalk
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