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Inoperative and Active Brake Assist Functions Limited

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Inoperative and Active Brake Assist Functions Limited

Old 11-08-2018, 07:51 PM
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Inoperative and Active Brake Assist Functions Limited

Just on the ride home I had both of these messages appear at once.....Inoperative and Active Brake Assist Functions Limited.... digital owner's manual tells me i should drive on carefully and consult workshop...

Anyone ever get these messages before??
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Old 11-08-2018, 08:43 PM
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Yes. I received the messages on my prior E Classes when driving through major South Florida downpours. The system notice then disappeared when the road conditions improved.
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Old 11-09-2018, 08:06 AM
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I got this message on the weekend on my 2019 C300....It was early in the morning and there was still some condensation on the windshield, so maybe there was also condensation on the star emblem where the radar is? After driving more, and the car getting direct sunshine, it seems to have resolved. The message did not occur again, and there were no lingering messages that I could see under the Service (if I remember right) menu.

I've had that message before, too, on my 2016 GLC when driving through wet snow, and there was a lot of snow caked up on the star emblem.
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Old 12-22-2018, 06:14 PM
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Same Messages

I have a 2018 Benz E300 with only 3500 miles. I received the same messages yesterday and today, both times the vehicle lost power. There was a guy behind me and I had to stop because the person in front was turning. I went to accelerate and it would not go and the guy behind me had to slam on his brakes. I had my 7 year in the car and he sits in the back. This is so unsafe. We just had the car towed an hour ago and they gave us a loaner. Since it’s December 22 we probably won’t hear back


until after Christmas. This is the second time we had problems with this car and only had it for 3 1/2 months.

QUOTE=jhpmbusa;7598521]Just on the ride home I had both of these messages appear at once.....Inoperative and Active Brake Assist Functions Limited.... digital owner's manual tells me i should drive on carefully and consult workshop...

Anyone ever get these messages before??[/QUOTE]

Last edited by Rose Pitts; 12-22-2018 at 06:16 PM.
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Old 12-22-2018, 06:36 PM
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Yes, I also received the same warning earlier this month after my windshield on my 2019 CLS had to be replaced. The problem was diagnosed after it was found that the new MB windshield had two small sized patches affixed to it and had blocked the interior camera. The patches were removed and thats how the problem was solved! The camera having being blocked was sending the message intermittently and affecting our Distronic system as well. Hopefully, your issue will be solved soon.



Last edited by haibieb; 12-22-2018 at 06:43 PM.
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Old 12-22-2018, 07:35 PM
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They made need to check the auxiliary battery as well.
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Old 01-08-2019, 10:24 PM
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so dropped off the car and they had to update the software... also mentioned something about changing out the battery as well. hope it fixes the issue as i had the sign pop out randomly around 5 times within a span of a couple of months.
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Old 01-09-2019, 10:31 AM
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Hopefully that does the trick and that's the end of it.
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