hearthole

Today, I got a warning stating that active braking and lane keeping assist are inoperable. I turned the car off and back on but get the same message. The car seems to drive normally. Has anyone else had this issue? I will call my dealer tomorrow.

c4004matic

when my Mbux system "took a respite" (ceased to work) for one afternoon I got the same message. It was fine the next morning and has never happened again.

bishop64

My W223 had these two hiccups (Active Lane Assist and Active Brake Assist Inoperative) once in the entire past year since new delivery.
Each time, I let the car sits overnight and they went away the next morning.
My dealer told me that this is likely caused by the sensors/radars are confused by some external interference and the computer decided to not offer these 2 assistance temporarily. Sitting overnight, the computer runs internal diagnostic and resets itself. If they do not go away after a day or two, then visiting the dealer is next.

Old Dawg

Are you also getting a tire low pressure warning. I had the pressure warning followed by the errors you mentioned. Add air to the tire and all is well.

hearthole

Interesting, I do I have a low tire pressure warning as well.

Old Dawg

A little air and I bet you will be fine.

hearthole

Correcting the air in the tires fixed the problem.

c4004matic

👍
A lot of the systems are interconnected, thus an issue with one cascades to others. However, The main drivetrain seems to be isolated from everything else. That lets you drive the vehicle even with all the other doodads on the fritz.

AppleFan1

This morning, I got the same error that several features were now inactive. I also got the "check tire pressure" warning. I will take care of it this afternoon.

bishop64

For my W223, I once had ''Check tyre pressure'' and ''Active blind spot assist inoperative'' errors at the same time.
But I just corrected the tyre pressure at the gas station the day before and I double checked with my own pressure gauge which also showed correct pressures.
So, I 'reset' the tyre pressures by using those current values as ''reference''. Once I did that, both warnings/errors went away.
So, if you are sure the tyre pressures are correct, try resetting them as reference values.

AppleFan1

As expected, problem solved once the dealer increased all 4 tires to exactly to 42. The recommended pressure is 41 so as the previous poster mentioned above, maybe they should be reset.

My wife and I are taking the first long trip to Oak Brook, IL tomorrow and I wanted to make sure everything is working as it should. Btw, I just finished charging the battery to 100% charge and it shows a range of 466 miles. I know this accurate as long as the driving is in the city. It will probably be reduced to close to 400 miles on the Interstate since driving at fairly high speed consumes more power. I’ll try to keep the speed to less than 70 mph but it’s hard to do with this car. I have all season tires and 21 inch wheels.

c4004matic

At 65 you should get around 360 or a little more. Remember highway is the shortest range the car will provide. Let us know. To be safe start looking for a charger around 20% and go from the range predicted at that time.

Acta_Non_Verba

^^^^^^^^
THIS

Safety features interconnected with some drive systems will SHUT off if those drive systems are out of range or dysfunctional. They are not broken, just suspended until the primary interconnected system is restored. The message is to notify you NOT to rely on that feature.

On performance cars I've owned, features such as ESP (traction control) will turn off if there is a powertrain code pending such as misfires or any control feature of the "drive by wire" function. Here too, the message is - Don't count on traction control working until you fix the primary control feature.

AppleFan1

our trip from Des Moines was pleasure. However, there was one sort of scary incident. On I-80 I was in process of passing a truck and all of a sudden the seatbelts tightened with hard braking. I know this problem was reported at some other thread. I have no idea why this happened.

I charged the car 90 miles from home to 98% and reached our destination in Oak Brook, IL with 118 miles of range to spare. I'm guessing that my range during the trip was about 380 miles. I was driving at an average speed of 65-70 mph.

c4004matic

Turn the self braking to it least sensitive setting... Sounds like your passing maneuver was a little too close to the truck. The pre-colission system activated. Again, if you dial the system down to it least sensitive setting you avoid its activation when driving a little enthusiastically.

AppleFan1

If I’m understanding what you say, the options under collision avoidance assistance are early, medium, and late. I had it set on medium. I changed it to late before we left Oak Brook, IL today and headed back to Des Moines. Are those the settings that you’re talking about?

c4004matic

Correct!

AppleFan1

I did say that the trip was a pleasure but that’s while driving this fabulous machine. We had a problem with EA chargers not working properly in Williamsburg, IA. Please see my post the Electrify America thread.

AstroCV

I got the warning as well this past week. It happened the same time as my low tire pressure came up. I put air in the tires and was at the correct pressure but tire pressure alarm did not go away until I reset tire pressures via the service menu on the driver’s display. Once that was completed the lane keep and active brake began working again.

Newbyloub

I think I had the same experience. Although Mercedes Me told me my tire pressures were in an acceptable range, the car kept after me about checking tire pressures.
I had the message about some of the esoteric drive assistance systems not working, but, since I never have used them, I simply ignored them figuring the dealer could check it out when I took the car in.
My son put air in the tires and none of the messages have returned. I'm not going to bother with changing the pressure settings; it's not worth bothering with.
If all this shows me as prett9y much laissez-faire, so be it.

DTech

Had the same problem. Seemed to go away but replaced by a tire pressure warning that comes up on the dash center and will not go away. Seems like it has forgotten the correct tire pressure settings.I cannot find a way to set the target levels. Plan to take to dealer

wings1969

Don't take it to the dealer. Add air to the tires or reset the tire pressures via the manual procedure and the warnings will go away. The tire pressure warnings are going to be with us for awhile as we get colder ambient temps and the tires were set at higher ambient temps.

Newbyloub

Worked for me. a couple of weeks ago.

gsenk

I am not getting any error but the lane assist stays as white and stopped engaging. No trie pressure errors or other errors. Any thoughts?

hlothery

Check in settings and make sure it is turned on.....I've had mysterious things changed in settings from time to time. Otherwise, sounds like a trip to the dealer if it does not reset itself overnight.