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replace battery in keyfob?

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replace battery in keyfob?

 
Old 11-04-2018, 11:04 AM
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replace battery in keyfob?

i'm getting this message after owning the car for 11 months, how much time do i have before the battery completely dies?
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Old 11-04-2018, 11:33 AM
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Not sure but if it does you will need to open the car with the metal key in the fob and then put the fob in the holder to start and run.
i usually change batteries no more than a day after getting the message. I have had a dead key before in a c class and i just got the key not recognised message.
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Old 11-04-2018, 11:35 AM
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I wouldn't delay on that. It's not difficult to do and there's a really good chance that after only 11 months, your dealer parts department will replace it for you without charge.

When you park, turn off your car and lock it, double lock it, by tapping the lock button twice to hear two horn beeps. You'll see the led on the front of your key fob light up for a second. What this does is stop your key fob from constantly looking for the car and it preserves battery life significantly.
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Old 11-04-2018, 11:39 AM
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Originally Posted by rbrylaw View Post
I wouldn't delay on that. It's not difficult to do and there's a really good chance that after only 11 months, your dealer parts department will replace it for you without charge.

When you park, turn off your car and lock it, double lock it, by tapping the lock button twice to hear two horn beeps. You'll see the led on the front of your key fob light up for a second. What this does is stop your key fob from constantly looking for the car and it preserves battery life significantly.
do this each time i exit the car or once?
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Old 11-04-2018, 11:40 AM
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and what size battery does it take?
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Old 11-04-2018, 11:43 AM
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Originally Posted by nas2344 View Post
do this each time i exit the car or once?
Yes, every time you lock the car.

Originally Posted by nas2344 View Post
and what size battery does it take?
The keyfob uses a CR 2032 3V cell battery. Your owners manual details how to replace the battery on page 58.
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Old 11-04-2018, 11:58 AM
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What about locking from the trunk button that sounds the horn, does that have the same effect?
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Old 11-04-2018, 12:06 PM
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Originally Posted by rbrylaw View Post
I wouldn't delay on that. It's not difficult to do and there's a really good chance that after only 11 months, your dealer parts department will replace it for you without charge.

When you park, turn off your car and lock it, double lock it, by tapping the lock button twice to hear two horn beeps. You'll see the led on the front of your key fob light up for a second. What this does is stop your key fob from constantly looking for the car and it preserves battery life significantly.
Really good advice. It stops the key transmitting hence the power saving and therefore protects the key from being cloned as in the video.

https://youtu.be/AJb-P7TJFI0
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Old 11-04-2018, 12:27 PM
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Originally Posted by nas2344 View Post
What about locking from the trunk button that sounds the horn, does that have the same effect?
No, it doesn't. The only way to stop the fob from doing it is to double tap the lock button directly on the fob.
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Old 11-04-2018, 12:42 PM
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Battery is covered under warranty and is replaced at normal service intervals.
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