W213 key fob charging
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E300
W213 key fob charging
Does the charging happen inside the cup holder where there is a place to keep the key? or is it just a slot? Will the keyfob ever need batteries (or do they recharge like a phone battery?) if so, which way do we place it ?
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The key fob battery is not rechargeable. It's a CR2032 coin cell battery that you'll eventually need to replace. You should be getting a warning in the instrument cluster if the battery is low and needs replacing. They should last quite a while as the new key fobs in the W213 have a motion sensor in them, and they go to sleep if they don't sense any motion for 2 minutes. This is primarily for security to avoid the relay attacks where thieves use a device to relay the signal from your key fob sitting by your front door for example to the car in your driveway and steel it. By going to sleep the fob no longer sends out a signal until it sense motion again, and the added bonus is it preserves the battery. I'm going on three years now with my 2019 C63S with the original battery in the fob (same fob as the W213).
FYI...the place in the cup holder is to start the car if the fob battery is dead. It temporarily energizes the key fob
FYI...the place in the cup holder is to start the car if the fob battery is dead. It temporarily energizes the key fob
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That ^ 
Another thing to note is if you take your vehicle to service at a dealership and purchased PPM (it includes swapping the key fob battery as part of the service). Although I heard that some dealerships don't do this or they don't do it in certain countries. In Canada, for example, the service includes a key fob battery change.
Another thing to note is if you take your vehicle to service at a dealership and purchased PPM (it includes swapping the key fob battery as part of the service). Although I heard that some dealerships don't do this or they don't do it in certain countries. In Canada, for example, the service includes a key fob battery change.
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I replace the key fob battery at 18 months. Battery life depends on how much you use the key fob. I don't drive many miles, but make many 1-2 mile trips where I lock, close windows and unlock several times a day. Closing windows requires that the lock button be pressed until the windows are fully closed.
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I replace the key fob battery at 18 months. Battery life depends on how much you use the key fob. I don't drive many miles, but make many 1-2 mile trips where I lock, close windows and unlock several times a day. Closing windows requires that the lock button be pressed until the windows are fully closed.
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I was kinda wondering the same thing. One can place their finger on the square sensor on the door handle and don't let go until the windows are closed. No need to really take the fob out ever. Other than the cabs, most other models at least in the USA have handsfree access standard, so the trunk can be opened with a kick motion, which is what I do with my C63S coupe since there is also no button to open the trunk, but it has handsfree access.
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That ^
Another thing to note is if you take your vehicle to service at a dealership and purchased PPM (it includes swapping the key fob battery as part of the service). Although I heard that some dealerships don't do this or they don't do it in certain countries. In Canada, for example, the service includes a key fob battery change.
Another thing to note is if you take your vehicle to service at a dealership and purchased PPM (it includes swapping the key fob battery as part of the service). Although I heard that some dealerships don't do this or they don't do it in certain countries. In Canada, for example, the service includes a key fob battery change.
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Without a powered and functioning FOB, keyless entry doesn’t work. It’s being used whether you pull it out of your pocket or not.
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A bit off topic but curious, the C coupe does not allow you to open the trunk manually? On my E coupe, you push the top of the Mercedes emblem (also where rear camera is) to manually open the trunk. I also have kick to open as an option.
I was kinda wondering the same thing. One can place their finger on the square sensor on the door handle and don't let go until the windows are closed. No need to really take the fob out ever. Other than the cabs, most other models at least in the USA have handsfree access standard, so the trunk can be opened with a kick motion, which is what I do with my C63S coupe since there is also no button to open the trunk, but it has handsfree access.
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Nope, no manual opening the trunk. The emblem only pops open for the camera.
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I’m sure the power used isn’t the same. When the button is pushed , the FOB is transmitting a stronger signal. Try taping down one of the buttons and see how long the battery lasts.
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Last edited by superswiss; Jan 4, 2022 at 05:06 PM.
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Thanks for your explanation superswiss. Do you happen to know if keyless go constantly emit a signal when in your pocket or it only starts communicating when the car started searching and prompting for the signal to be broadcasted. Sort of like the car saying "Please wake up key, I need more information to confirm if I should authorize this access" or is it what I asked in the pervious sentence "Oh, good to see you door here is the identification, please confirm and grant access".
and...Which one do you prefer?
and...Which one do you prefer?
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Thanks for your explanation superswiss. Do you happen to know if keyless go constantly emit a signal when in your pocket or it only starts communicating when the car started searching and prompting for the signal to be broadcasted. Sort of like the car saying "Please wake up key, I need more information to confirm if I should authorize this access" or is it what I asked in the pervious sentence "Oh, good to see you door here is the identification, please confirm and grant access".
and...Which one do you prefer?
and...Which one do you prefer?
Last edited by superswiss; Jan 4, 2022 at 06:58 PM.
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I'm not intimately familiar with the specific protocol, but 99% sure the communication is initiated by the car and the fob responds. This is how digital locks I'm more familiar with work. They all use a beacon approach and if a key device comes within range of a recognized lock it responds to the beacon. These devices use proximity protocols. They basically first detect that they are in proximity of a locking device they recognize and then start the authentication handshake.
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I was kinda wondering the same thing. One can place their finger on the square sensor on the door handle and don't let go until the windows are closed. No need to really take the fob out ever. Other than the cabs, most other models at least in the USA have handsfree access standard, so the trunk can be opened with a kick motion, which is what I do with my C63S coupe since there is also no button to open the trunk, but it has handsfree access.
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Yep, only the square sensor works for the convenience closing, but otherwise you can touch anywhere on the outside part of the handle to just lock the car.
