Battery drain
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2021 c300 Cab. Arrived 7/28/21 . 24 GLE 450e.
I disagree with you: there is more power drain when the doors are not locked. When locked many functions go into "sleep mode".
As to problems: Very few of us post that we "have no problems": what you get on a forum are people seeking help with their cars.
The one exception: poor ride: but almost 100% of those with a complaint do not have standard wheels. I have standard wheels with RF and I have no problems with the ride.
As to problems: Very few of us post that we "have no problems": what you get on a forum are people seeking help with their cars.
The one exception: poor ride: but almost 100% of those with a complaint do not have standard wheels. I have standard wheels with RF and I have no problems with the ride.
I have been on a bmw forum for 5 years. In 2 days I saw more instances of cars being towed, or sitting for lack of parts. Or cars having to be jumped after 3 or 4 days and the dealer can’t figure out what’s wrong. I’m also on an Acura MDX forum. Nothing like what I’ve seen on here. And yet, I still want one.
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From: Long Island, NY
2019 E 450, 2016 E350 4matic (retired), 2018 Ford Edge Sport, 2008 Porsche Boxster
Can you name one function that only goes into sleep mode when the car is locked?
I have been on a bmw forum for 5 years. In 2 days I saw more instances of cars being towed, or sitting for lack of parts. Or cars having to be jumped after 3 or 4 days and the dealer can’t figure out what’s wrong. I’m also on an Acura MDX forum. Nothing like what I’ve seen on here. And yet, I still want one.
I have been on a bmw forum for 5 years. In 2 days I saw more instances of cars being towed, or sitting for lack of parts. Or cars having to be jumped after 3 or 4 days and the dealer can’t figure out what’s wrong. I’m also on an Acura MDX forum. Nothing like what I’ve seen on here. And yet, I still want one.
Hope this helps
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From: Illinois
2021 c300 Cab. Arrived 7/28/21 . 24 GLE 450e.
I looked up some things I found some test that talks about locking the car before testing the current draw. Nothing that specifically states that a car draws more power when unlocked than locked. Besides, I think the people with problems may be keeping their FOBs too close to the car.
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From: San Jose area
'19 E63S sedan
I looked up some things I found some test that talks about locking the car before testing the current draw. Nothing that specifically states that a car draws more power when unlocked than locked. Besides, I think the people with problems may be keeping their FOBs too close to the car.
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What makes it better than this :https://shop.advanceautoparts.com/p/...297/11988176-P
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Can you name one function that only goes into sleep mode when the car is locked?
I have been on a bmw forum for 5 years. In 2 days I saw more instances of cars being towed, or sitting for lack of parts. Or cars having to be jumped after 3 or 4 days and the dealer can’t figure out what’s wrong. I’m also on an Acura MDX forum. Nothing like what I’ve seen on here. And yet, I still want one.
I have been on a bmw forum for 5 years. In 2 days I saw more instances of cars being towed, or sitting for lack of parts. Or cars having to be jumped after 3 or 4 days and the dealer can’t figure out what’s wrong. I’m also on an Acura MDX forum. Nothing like what I’ve seen on here. And yet, I still want one.
I lock the car whenever I'm not in it - even in my garage. If you've ever sustained a burglary or home invasion, you'll understand.
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2021 c300 Cab. Arrived 7/28/21 . 24 GLE 450e.
As far as locking the car in the garage. I don’t keep anything valuable in the car.
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Correction - the double tap deactivates the keyless-go fob and its battery drain. Pressing any button on the fob reactivates it. The main advantage of deactivating the keyless-go fob is that the vehicle cannot be unlocked/opened by touching the door handle even when the fob is within range. Everywhere within my house is within fob range when the car is parked in my garage. I'd hate to wake up one morning to find that the car was stolen from my garage because the fob granted access. BTW I much preferred the early 2000 keyless-go that used a credit card type fob that was much easier to leave in one's pocket than the bulky fob of today..
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From: New Jersey
MB W213 E300 4MATIC Luxury Model
I have been having problems with my E class.
for the past month there has been a parasitic drain it has been in and out of the dealership but it still keeps draining and its unable to start.
Its temperamental and happens at random times. I have tried checking how much power fuses are drawing and all of them seem okay.
has anyone got any suggestions?
for the past month there has been a parasitic drain it has been in and out of the dealership but it still keeps draining and its unable to start.
Its temperamental and happens at random times. I have tried checking how much power fuses are drawing and all of them seem okay.
has anyone got any suggestions?
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From: San Jose area
'19 E63S sedan
Correction - the double tap deactivates the keyless-go fob and its battery drain. Pressing any button on the fob reactivates it. The main advantage of deactivating the keyless-go fob is that the vehicle cannot be unlocked/opened by touching the door handle even when the fob is within range. Everywhere within my house is within fob range when the car is parked in my garage. I'd hate to wake up one morning to find that the car was stolen from my garage because the fob granted access. BTW I much preferred the early 2000 keyless-go that used a credit card type fob that was much easier to leave in one's pocket than the bulky fob of today..
2. For this reason, not only is it secure but it also doesn't drain the fob battery.
Try it. Leave the key in your house after just locking the door and not deactivating it. 20 minutes later, see if the door will open. Then go back, lift the fob, set it back down and verify the door now opens.
Your ritual doesn't hurt anything, but is unnecessary with the latest fob design.
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From: San Jose area
'19 E63S sedan
Where is the car parked in comparison to where the key is kept. Try double clicking the lock button on the key to disable the keyless go feature. If the key is too close to the car, the car will constantly try to connect to the key which will eventually drain the battery
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1. After a couple of minutes, a key times out and will not allow the car to be opened or started until you pick up the key again and move it.
2. For this reason, not only is it secure but it also doesn't drain the fob battery.
Try it. Leave the key in your house after just locking the door and not deactivating it. 20 minutes later, see if the door will open. Then go back, lift the fob, set it back down and verify the door now opens.
Your ritual doesn't hurt anything, but is unnecessary with the latest fob design.
2. For this reason, not only is it secure but it also doesn't drain the fob battery.
Try it. Leave the key in your house after just locking the door and not deactivating it. 20 minutes later, see if the door will open. Then go back, lift the fob, set it back down and verify the door now opens.
Your ritual doesn't hurt anything, but is unnecessary with the latest fob design.
MBWorld Fanatic!
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From: San Jose area
'19 E63S sedan
MBWorld Fanatic!
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From: Illinois
2021 c300 Cab. Arrived 7/28/21 . 24 GLE 450e.
Correction - the double tap deactivates the keyless-go fob and its battery drain. Pressing any button on the fob reactivates it. The main advantage of deactivating the keyless-go fob is that the vehicle cannot be unlocked/opened by touching the door handle even when the fob is within range. Everywhere within my house is within fob range when the car is parked in my garage. I'd hate to wake up one morning to find that the car was stolen from my garage because the fob granted access. BTW I much preferred the early 2000 keyless-go that used a credit card type fob that was much easier to leave in one's pocket than the bulky fob of today..
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Besides the key fob going to sleep if not in motion, keyless go only works within a few inches of the door. In other words, if you are inside your house and near the garage door, someone else can not unlock your door. There is a difference between the range of the buttons and the keyless go. With your fob inside your house, someone will not be able to start your car. Unless of course they have one of those devices that increases the range of the fob. But, that’s a different discussion.
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From: Illinois
2021 c300 Cab. Arrived 7/28/21 . 24 GLE 450e.
Than Mercedes does everything differently. Both of my cars won’t start if the key is not on me or in the car. You could start the car and drive away and not realize you don’t have the key. I’ve had to go back to get the key several times. If you start the car than drive away, does it warn you?
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I have not tried it, but there should be a no key detected message on the cluster. I know that if the car is started then the key removed, one cannot shift the transmission. From outside with the fob I could lock my BMW with the engine running, but I can't do it in the W213. Now I have to use remote start to pre-cool the car. 
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2019 E 450, 2016 E350 4matic (retired), 2018 Ford Edge Sport, 2008 Porsche Boxster
MANY, MANY THANKS for posting!
This is a fantastic video.
As in the video, while the battery in my car has not gone dead, I have been replacing the battery in my smart key every couple of months: now I know why.
Great Video!
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From: Long Island, NY
2019 E 450, 2016 E350 4matic (retired), 2018 Ford Edge Sport, 2008 Porsche Boxster
So I just double clicked my key to lock - as the video suggested to turn off the "hand shaking" feature.
I then went to my car, with the key in hand, touched the door handle and the car unlocked.
From the video I thought that after double locking the door touching feature to unlock was disabled?
Just went back to the video: clearly after double clicking the key, the smart key feature, touching the handle was disabled. On my car that feature still works.
Am I missing something?
What did I do wrong?
Thanks.
I then went to my car, with the key in hand, touched the door handle and the car unlocked.
From the video I thought that after double locking the door touching feature to unlock was disabled?
Just went back to the video: clearly after double clicking the key, the smart key feature, touching the handle was disabled. On my car that feature still works.
Am I missing something?
What did I do wrong?
Thanks.
Last edited by JTK44; Feb 15, 2021 at 09:56 AM.
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From: Long Island, NY
2019 E 450, 2016 E350 4matic (retired), 2018 Ford Edge Sport, 2008 Porsche Boxster
Follow up:
I have two keys both in range of my E450. If I double click, the smart feature was not disabled.
But if I moved key #2 out of range, and then double clicked the key #1, next to the car, the smart feature for that key #1 was disabled.
However, with the smart feature "disabled" by key #1, when I went to the car with Key #2, the smart feature was not disabled.
My conclusion: to disable the smart key feature and put your car to sleep, both keys must be out of range when you double click.
In the video, with both keys within range, double clicking would not have disable the smart key feature.
But if you are in parking lot, double clicking your key would disable the smart key feature, assuming your second key is not in the car!
I have two keys both in range of my E450. If I double click, the smart feature was not disabled.
But if I moved key #2 out of range, and then double clicked the key #1, next to the car, the smart feature for that key #1 was disabled.
However, with the smart feature "disabled" by key #1, when I went to the car with Key #2, the smart feature was not disabled.
My conclusion: to disable the smart key feature and put your car to sleep, both keys must be out of range when you double click.
In the video, with both keys within range, double clicking would not have disable the smart key feature.
But if you are in parking lot, double clicking your key would disable the smart key feature, assuming your second key is not in the car!
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Second Follow up:
As I posted, if you disable smart key with key #1, the smart key function will not work with key #1, but will work with key #2.
If it works with key #2, what will prevent the car attempting to "hand shake" with other smart keys as in a parking lot?
Here is another video on the subject:
As I posted, if you disable smart key with key #1, the smart key function will not work with key #1, but will work with key #2.
If it works with key #2, what will prevent the car attempting to "hand shake" with other smart keys as in a parking lot?
Here is another video on the subject:
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2021 c300 Cab. Arrived 7/28/21 . 24 GLE 450e.
The car should tell you when the fob battery needs to be replaced.
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From: Long Island, NY
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