G K

I have a 2014 ML350 4Matic and for about a week now its been showing the Blindspot assist inoperative messages, as well as the safety functions limited message every time I start the SUV...
I cleaned both sensors from inside the bumper and blasted the connections with air. They were extremely dirty so I thought it would be fixed the problem, but it didn't.
I then checked fuse 116 under the rear seat which is for Drivers assistance (BSM, Lane departure, and Distronic), it was blown out so I switched it.
The safety functions limited message doesn't come up anymore, but the Blindspot inoperative is still coming up. Any ideas about what it could be..?
thinking one of the sensors itself needs to be replaced, will most likely try finding a used one if it is the case.

geniushanbiao

You need to find a Star/Xentry system to read out what's actually the problem. It can be that the computer thinks the indicator light on the mirror is defective. Mine had such issue before and I solved it by replacing a side mirror. I used a $500 cloned system I bought from China.

Dave ML350

I had the same problem when I had a minor accident that damaged the front guard. Once the sensor was replaced all returned to normal.

W211.

hey what steps did you take on xentry ti have it work again? Thanks in advance

geniushanbiao

It's been some time so I might be a little rusty. Basically after initiating you go into the module and check the error code and message. If I remember correctly the blind spot stuff should be in the door module but I can be wrong on this. For mine it was that the driver side blind spot light error but actually that light works. You can go into actuation to turn that light on and off to see if it actually works. And in the error code page you can erase the code. For mine I remember I replaced the mirror glass due to the heater not working (tested resistance showed infinite), but I put the original blind spot light back. After clearing the code it worked fine. My guess is that someone serviced the door/mirror without disconnecting battery which logged this error and disabled the system. You can diagnose yours based on what error message is there.

Qikslime

Hi. Possibly not your problem here, but when i first bought my ML63 second hand, I got lots of messages like this when i would start the car. Sometimes none, sometimes one or two, sometimes more, and then sometimes none again. (Blindspot, park assist, etc). Once i replaced both batteries all of this went away. So if your batteries are old, you could try that.