W222 Safety Feature Problem! Help!
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Joined: Mar 2022
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2024 Mercedes-Benz E350
W222 Safety Feature Problem! Help!
I have a 2015 S550 that has 66,000, and has become my everyday driver as of March 2021. Here in Connecticut, we had an ICE COLD day about 2.5 weeks ago, and it was about 0-5 degrees for a day. My car was parked at my office outside for about 6 hours, and when I turned it on, it started relatively ok. After letting it sit for about 15 minutes to get warm, and driving about 2 miles down the road, I got an audible sound, and the display read, "Active Lane Keep Assist Inoperative," "Active Blindspot Assist Inoperative," "Pre-safe Functions Inoperative," "Distronic Plus Inoperative." I pulled over, and turned the car on and off about 5 times and the messages did not go away.
I got home, let the car sit, and then turned it on a few hours later, and they were gone. Since that day, the same messages come up about once or twice a week, and usually go away after I turn the car off and on again. I get a few days when nothing happens, and then a day or two in a row where it happens once or twice.
I drive the car about 100-200 miles per week, and also had the main battery changed about 15 months ago. When the warnings don't show up, the features work completely fine! My guess is it could be the auxiliary battery? I don't know why this is changed when it was cold, but my guess is that cold day must have activated the problem?
Any thoughts? The wait time to get to a dealer is over 1 month!
I got home, let the car sit, and then turned it on a few hours later, and they were gone. Since that day, the same messages come up about once or twice a week, and usually go away after I turn the car off and on again. I get a few days when nothing happens, and then a day or two in a row where it happens once or twice.
I drive the car about 100-200 miles per week, and also had the main battery changed about 15 months ago. When the warnings don't show up, the features work completely fine! My guess is it could be the auxiliary battery? I don't know why this is changed when it was cold, but my guess is that cold day must have activated the problem?
Any thoughts? The wait time to get to a dealer is over 1 month!
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From: Pacific Northwest
2001 S600 V12 Sold, 2011 Jaguar XFR Sold, 2017 S550 4-Matic, 2018 S63 AMG Sedan
All those faults could have been caused by low battery voltage, in the main or aux battery. They are stored and probably just need to be cleared. You might be able to purchase a cheap Harbor Freight code reader and clear the codes yourself. That way you know if it comes back there really is a problem.
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2014 S550 AMG, 2017 XT5
I have a 2015 S550 that has 66,000, and has become my everyday driver as of March 2021. Here in Connecticut, we had an ICE COLD day about 2.5 weeks ago, and it was about 0-5 degrees for a day. My car was parked at my office outside for about 6 hours, and when I turned it on, it started relatively ok. After letting it sit for about 15 minutes to get warm, and driving about 2 miles down the road, I got an audible sound, and the display read, "Active Lane Keep Assist Inoperative," "Active Blindspot Assist Inoperative," "Pre-safe Functions Inoperative," "Distronic Plus Inoperative." I pulled over, and turned the car on and off about 5 times and the messages did not go away.
I got home, let the car sit, and then turned it on a few hours later, and they were gone. Since that day, the same messages come up about once or twice a week, and usually go away after I turn the car off and on again. I get a few days when nothing happens, and then a day or two in a row where it happens once or twice.
I drive the car about 100-200 miles per week, and also had the main battery changed about 15 months ago. When the warnings don't show up, the features work completely fine! My guess is it could be the auxiliary battery? I don't know why this is changed when it was cold, but my guess is that cold day must have activated the problem?
Any thoughts? The wait time to get to a dealer is over 1 month!
I got home, let the car sit, and then turned it on a few hours later, and they were gone. Since that day, the same messages come up about once or twice a week, and usually go away after I turn the car off and on again. I get a few days when nothing happens, and then a day or two in a row where it happens once or twice.
I drive the car about 100-200 miles per week, and also had the main battery changed about 15 months ago. When the warnings don't show up, the features work completely fine! My guess is it could be the auxiliary battery? I don't know why this is changed when it was cold, but my guess is that cold day must have activated the problem?
Any thoughts? The wait time to get to a dealer is over 1 month!
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Joined: Mar 2022
Posts: 125
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2024 Mercedes-Benz E350
thats what I'm thinking. Today it came on 3-4 times. I have the car parked for the night (8 hours), and I put a trickle charger on. Let's see what happens! The dealer can't get me in for a month, if it is the auxiliary battery. I don't know!
I'm also having some trouble from time to time with the keyless entry. In the cold, if the car is outside for a long time, the car needs to be unlocked by pressing the key fob, not by just putting my hand under the door handle.
I'm also having some trouble from time to time with the keyless entry. In the cold, if the car is outside for a long time, the car needs to be unlocked by pressing the key fob, not by just putting my hand under the door handle.
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From: Venice Florida
2018 S560
Sounds like a Aux battery but makes you wonder why you didn't get the Aux Battery malfunction message on the middle screen. You could take off the panels on the right side of the trunk (passenger side) to expose the aux battery and take it to a Batteries plus store and have them put a tester on the aux battery and the main battery. If you didn't feel comfortable replacing the aux battery yourself you could buy one from Batteries plus and bring it to a independent Mercedes repair shop and have them replace it. Thats what I did recently. Dealer wanted 475 dollars to replace the aux battery and I got the battery from Batteries plus for 80 dollars and the independent shop installed it for me for 120 dollars. A 275 dollar savings. Make sure your plastic cover over the distronic sensor in the middle of the grill is clear of salt and road debris as that can make it so the adaptive cruise won't work and you get a error message.
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From: Southwest Florida
2019 S560 4MATIC Sedan
I get the Active Brake Assist and Active Blind Spot Assist warnings on mine a 2019 S560. After scanning for codes I found a bad Left Rear bumper radar sensor.
It also happened after a couple of Love Bugs splattered on my radar screen on the front grill.
It also happened after a couple of Love Bugs splattered on my radar screen on the front grill.
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2024 Mercedes-Benz E350
Thanks Everyone! I made an appointment to for the dealer next Thursday March 2nd in the morning. Just weird that It only happens after the car sits. Today it happened during the first start up, then I restarted the car and it was fine all day. who knows.
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From: Lower Westchester, NY
2018 s560v4
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S600
A couple of years ago, I was driving from Roswell to Austin in freezing rain. About an hour into the trip those same alarms went off. I put it up to the sensors being clogged with ice and not being able to get the radar or ultrasonic stuff out of the car and into free-space. When I got home, the front of the car was covered with about 1" of solid ice...... I can see how the radar and ultrasonics could not leave the body through the ports they are supposed to use. They come an go periodically, mainly associated with bad winter weather.
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I have exactly the same problem on exactly the same model and year - SClass W222 2019 S560.. Thank you for posting.
When you say "a bad left Rear Bumper radar sensor" do you mean the little disc parking sensors on the bumper of which there are 4 - one on each corner and 2 in the centre of the bumper ?
When you say "a bad left Rear Bumper radar sensor" do you mean the little disc parking sensors on the bumper of which there are 4 - one on each corner and 2 in the centre of the bumper ?
Member
Joined: Feb 2021
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From: Lower Westchester, NY
2018 s560v4
I have exactly the same problem on exactly the same model and year - SClass W222 2019 S560.. Thank you for posting.
When you say "a bad left Rear Bumper radar sensor" do you mean the little disc parking sensors on the bumper of which there are 4 - one on each corner and 2 in the centre of the bumper ?
When you say "a bad left Rear Bumper radar sensor" do you mean the little disc parking sensors on the bumper of which there are 4 - one on each corner and 2 in the centre of the bumper ?
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Joined: Apr 2007
Posts: 120
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Just thought I would add ....
If you can, before you commit to a new Aux battery, have one tested.
See my thread (search by my user name JOSHUA)
I recently had 3 warnings - lane keep assist, brake assist and blind spot assist were all inoperative and occurred at the same time.
I replaced my Aux Battery anyway ... This did not clear the problem warnings...
AFTER I had my new AUX battery installed I was curious and asked them to check the old battery. The result under loan was "good battery" but since it was 4 years old I went ahead and changed it anyway.
Hope this assist to narrowing down your problem
If you can, before you commit to a new Aux battery, have one tested.
See my thread (search by my user name JOSHUA)
I recently had 3 warnings - lane keep assist, brake assist and blind spot assist were all inoperative and occurred at the same time.
I replaced my Aux Battery anyway ... This did not clear the problem warnings...
AFTER I had my new AUX battery installed I was curious and asked them to check the old battery. The result under loan was "good battery" but since it was 4 years old I went ahead and changed it anyway.
Hope this assist to narrowing down your problem
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Joined: Apr 2007
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There is a very good Youtube video on removing an S Class Bumper. I shudder to think what the dealer may charge for labour if indeed the radar control module(s) happen to be the problem.
