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Hyundai Genesis Forum: Key Fob Battery Replacement
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  #1  
Old 07-26-2010, 02:24 PM
morsegeek morsegeek is offline
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Default Key Fob Battery Replacement

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The battery in the key fob for my 2009 3.8 Genesis seems to be dying. I have to stand closer to the car to be able to open the door than I did a month or two ago.

Has anyone replaced the battery in their key fob? There is no obvious way to open it and I want to avoid damaging it. I assume it uses some type of watch battery for power.
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Old 07-26-2010, 03:45 PM
Paulroger Paulroger is offline
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Default Re: Key Fob Battery Replacement

Page 4-10 of the owners manual states:
" 1. Pry open the rear cover of the smart key. 2. Replace the battery with a new battery (CR2032)."
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Old 07-26-2010, 05:27 PM
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Default Re: Key Fob Battery Replacement

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Originally Posted by Paulroger View Post
Page 4-10 of the owners manual states:
" 1. Pry open the rear cover of the smart key. 2. Replace the battery with a new battery (CR2032)."
I saw that as well, but it provides no directions or diagrams on how to pry off the cover. The fob is not made of especially hard plastic and I'd rather not leave large, unsightly screw driver marks. I suppose it's a matter of inserting a slotted screw driver in the seam between the two halves of the fob and prying but has anyone actually done this yet?
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Old 07-26-2010, 05:34 PM
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Default Re: Key Fob Battery Replacement

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Originally Posted by morsegeek View Post
I saw that as well, but it provides no directions or diagrams on how to pry off the cover. The fob is not made of especially hard plastic and I'd rather not leave large, unsightly screw driver marks. I suppose it's a matter of inserting a slotted screw driver in the seam between the two halves of the fob and prying but has anyone actually done this yet?
I tried to pry it open with a flat head screw driver just for the heck of it when I was playing with the idea of removing the H logo and replacing it with the wing badge.
Wouldn't budge.
Just left a nice scratch on the fob.
Anyone finds an easier way to open it, I'd be glad to know.

Dan
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Old 07-26-2010, 05:42 PM
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Default Re: Key Fob Battery Replacement

I never noticed it before, that there is no slot for a coin or screwdriver. When I go to change mine out, I will use a sharp knife, in the crease between the two halves.
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Old 07-26-2010, 05:49 PM
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Default Re: Key Fob Battery Replacement

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Originally Posted by ctrcbob View Post
I never noticed it before, that there is no slot for a coin or screwdriver. When I go to change mine out, I will use a sharp knife, in the crease between the two halves.
There are two squire slots on both side of the fob.
I tried a flat head screw driver that was exactly the same as the diagonal opening and turned it clockwise to see if it does the trick.

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Old 07-26-2010, 05:55 PM
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Default Re: Key Fob Battery Replacement

I used a plastic tool kit made to repair small electronics such as Blackberry, Iphone. It comes with a plastic pic like a guitar pic which worked great.
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Old 07-31-2010, 12:11 PM
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Default Re: Key Fob Battery Replacement

There is a notch under the trunk key that you can put a screwdriver in and open the fob. The trunk key can also be used to open the fob in a pinch but it is likely to cause the marring you are trying to aviod. Another thing I noticed is if you take the battey out of the fob and stick it in the slot in the console the car will still start. Good news if your fob battery completely dies.

The notches in the side are for the slot in the console
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Old 07-31-2010, 09:28 PM
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Default Re: Key Fob Battery Replacement

I thought pushing the key fob into that slot just below the disc drive charges the battery, or at least that is what the dealer told me
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Old 07-31-2010, 09:34 PM
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Default Re: Key Fob Battery Replacement

Wrong- it is just the fob placeholder- no charging.
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Old 07-31-2010, 09:50 PM
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Default Re: Key Fob Battery Replacement

Quote:
Originally Posted by STREETS View Post
Wrong- it is just the fob placeholder- no charging.
Note:
"If the {smart key} battery is weak or the smart key
does not work correctly, you can start
the engine by inserting the smart key
into the smart key holder."
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Old 07-31-2010, 10:17 PM
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Default Re: Key Fob Battery Replacement

When placing the FOB in the slot it makes the required matching as if it were an emobilizer. In short if the battery is dead and the emobilizer can't make the required electronic signal, then by simple putting the Fob into the slot mechanically make the match for the emobilizer.

Battery is good=======electonic signal sends the code to the emobilizer.
Battery no good=======physically install FOB and match is made mechanically to the emobilizer.
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Old 08-01-2010, 04:32 PM
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Default Re: Key Fob Battery Replacement

I think the slot has an RF power transmitter that will power the fob if the fob battery is dead. (take the battery out and the car will start with the fob in the slot)

The battery is a lithium watch button type and is not rechargable.
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Old 08-01-2010, 08:12 PM
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Default Re: Key Fob Battery Replacement

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I think is an interesting assumption.
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Old 08-24-2011, 01:00 PM
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Default Re: Key Fob Battery Replacement

For replacing battery in Genesis FOB I found this video helpfull.


I found using a 1 inch putty knife worked better than a screw driver.
The removed battery measured 2.902V and intermittently wouldn't open the doors. New battery 3.3V and appears to be working.
Not much of battery loss but I guess thats all it takes.

In the future I'm going to schedule replacement every 18Months or so, or atleased put a spare battery in the trunk along with a putty knife just in case.

Last edited by Bob815; 08-24-2011 at 01:10 PM.
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