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I have a 2005 Hyundai Elantra. This morning the battery on my wireless key fob died, so I'm unable to use it to unlock the car. From past experience, I know that unlocking the car using the physical key will set off the alarm.

  • How can I turn off the alarm after unlocking the car with the physical key?
  • Should I be able to replace the battery in the key fob myself, or will I have to take it to a dealer or somewhere else?
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4 Answers 4

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From the owners manual.

Alarm Stage

The alarm will be activated if any of the following occurs while the car is parked and the system is armed.

  1. A front or rear door is opened without using the transmitter or the ignition key.
  2. The trunk lid or tail gate is opened without using the transmitter or the ignition key.
  3. The hood is opened.

The siren will sound and the turn signal lights will blink continuously for about 30 seconds (This will repeat 3 times). To turn off the system, unlock the door or trunk lid/tail gate using the transmitter or the ignition key.

Disarmed Stage

The system will be disarmed by using the transmitter or the ignition key.

Now the way that reads it seems that opening the door with the ignition key won't make the alarm go off. In my experience it means if you use the ignition key to turn on the ignition it will disarm the alarm. Most cars I am familiar with will do some type of pre-warning when the door is unlocked using the key, and if the ignition key is used to start the vehicle within x number of seconds the alarm will not go off. Even if it goes off in your case try starting the car and that may silence the alarm.

As far as battery replacement the owners manual also addresses that.

Replacing the battery

When the transmitter's battery becomes, it may take several pushes on the button to lock or unlock the doors, and the LED will not light. Replace the battery as soon as possible.

Battery type : CR2032

Replacement instructions:

enter image description here

Carefully separate the case with a blade screwdriver as shown in the illustration.

enter image description here

Remove the old battery from the case and note the polarity. Make sure the polarity of the new battery is the same (+side facing down), then insert it in the transmitter

Also note unlike the Audi you will NOT have to reprogram your remote.

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    I'm so glad to hear this because my key fob's bound to die very soon (same car). The alarm goes off immediately if I use the physical key. I think there's some state machine at play, where it depends on how you locked the car last (with key, driver door button, or fob button). But that's just a theory :)
    – Chris Cameron
    Commented Jan 31, 2014 at 2:37
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I found these instructions on this site.

enter image description here

According to the instructions, the battery is a simple CR2032 battery, found anywhere you can find batteries (like Wal-Mart, or whatever). If there is a second transmitter, use it. If not, you can try opening the door with the key, then using the key in the ignition. This works in some vehicles, but once the alarm is hit, you know the deal. If you don't want to try this, you can probably find another battery around your house to use for the mean time, such as in a different key fob or in an unused computer (in the motherboard). This will get you by until you can get a new battery for your fob. When you pull the battery out of your fob, you will not lose the code or need to have the fob reprogrammed. It is made to stay paired, fob with the car.

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  • "or in an unused computer" -- clever!
    – GamerJosh
    Commented Jan 16, 2014 at 16:10
  • @GamerJosh ... the only reason I know for sure it's a CR2032 in a computer is I just replaced one, lol.
    – Pᴀᴜʟsᴛᴇʀ2 ♦
    Commented Jan 16, 2014 at 16:17
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I have an Audi, and the physical key sets and releases the alarm system. So it should not set the alarm if you use the key to open the doors. Did you actually try to unlock the car with the key and it sets the alarm off?

When my battery dies, and the FOB is disconnected from the car I have to plug the key into the slot, and turn the car on/off (not the engine though) five times and then the key is reprogrammed with the car. For 2005 Hyundai Tiburon, the instructions are:

  1. Get in car.
  2. Close doors.
  3. Turn key to ACC.
  4. Hold open button down on remote, until blinkers flash.

Replacing the battery is really simple. You can use a flathead screw driver, and be gentle and it should be easy. This video shows how to do it. It should be fairly easy. DO NOT go to the dealer... They will charge you way too much for it, and then will find something wrong with your motor as well.

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  • I have, in the past, set off the alarm by simply unlocking the door using the physical key--so yes. Does your second paragraph imply that when the key fob battery dies, it loses its programming? That video should be useful, thank you for that!
    – GamerJosh
    Commented Jan 16, 2014 at 15:59
  • @GamerJosh ... Changing the battery should not cause you to lose the connection between car and fob, at least this is the way it works in most cases. The car learns the fob, not the other way around. If you go through the process of reprogramming, ALL fobs attached to the car will need to be re-associated with the car, because it blanks all fob codes at that point. If you need to, have all fobs available at the time of the reprogramming.
    – Pᴀᴜʟsᴛᴇʀ2 ♦
    Commented Jan 16, 2014 at 16:14
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    @Paulster2 Interesting, I wouldn't have assumed that the programming was in that direction, but it makes total sense in hind-sight. Thank you!
    – GamerJosh
    Commented Jan 16, 2014 at 16:23
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    I agree. Programming the FOB key to the car is one process. However, I think that there is a secondary process which should be called "linking" or something similar. For example with my Audi, it unlinks key from the car when I press too often too many times on any of the buttons (for security reasons), or when battery dies.
    – KingsInnerSoul
    Commented Jan 16, 2014 at 17:25
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On a Hyundai Getz, if you want to disable the alarm so that you can use either the fob or the key to lock/unlock the car, you can bypass the hood switch so that the alarm circuit thinks the hood is open, and it will not go into the Arm state.

This is equivalent to just locking the car with the key.

The hood switch connects to ground when the hood is open, so you just have connect the single switch wire to ground.

You can also fit a switch so that you can select whether you want the alarm active or not.

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