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Discussion Starter · #1 ·
According to the manual, it states:

Electrical malfunction warning lamp * The red electrical malfunction warning lamp is lit. There is a malfunction with the electrics. # Note the messages on the driver display.

Is this really a 12V battery issue or not?

I can't unlock the doors when it was lit, and the one time I did get into the car using the emergency key to start car, I got the following error message on the driver display:
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Discussion Starter · #3 ·
Could be the car's electric system that draws power from the 12v battery. I would consult someone at Mercedes, like the workshop or rescue service, immediately
It's at the dealership now for service.

They are trying to recreate that error message (doors can't unlock, red battery icon lit) by doing an extended test drive.

It's very frustrating not knowing why this is happening. I'm sure the higher ups (engineers) at MB Germany HQ should know why.
 

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Discussion Starter · #6 ·
You could mention it though I would expect the dealer diagnostic software to have already checked
Yeah they probably checked it already. They still have NO idea why the 12v battery icon was lit on 3 occasions and doors can't unlock. I'll give them a few more days to figure it out. After that I'll probably send the car back to the dealership where I bought the car from.
 

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Discussion Starter · #7 ·
Yeah they probably checked it already. They still have NO idea why the 12v battery icon was lit on 3 occasions and doors can't unlock. I'll give them a few more days to figure it out. After that I'll probably send the car back to the dealership where I bought the car from.
UPDATE: All the vehicle's software were updated by the dealership. Since then, no more unlocking door problem.
 

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Could be the car's electric system that draws power from the 12v battery. I would consult someone at Mercedes, like the workshop or rescue service, immediately
I had the same warning the first day I got the car last week. At the same time, several other messages said that none of the auto functions, like cruise control would work, and they didn’t. Took the car in (they gave me an E350 loaner, which after the EQS, drove like a Russian tractors, but I digress. Next day, I got the following message from my Service Advisor:
Good morning. I have some good news on the EQS. The 12v battery warning is a false indicator. The sensor that reads that battery is not reading correctly. The battery itself has full power and shows no signs of being discharged. The test for this sensor is about as black and white as it comes. We have system voltage all the way to that sensor, and the test for it is simply "is there voltage to the sensor, yes/no. If yes, replace sensor" I have one coming out of Texas, ordered yesterday, so it will likely be here Monday. The other warnings were due to a module just needing a software update. I will reach out again once I know we have the part in hand. Thank you!

All is good now, except NOW no one can figure out why now the autopark feature won’t work, and I wondered why the referenced software update wasn’t done OTA. I raised that issue with MBUSA and was told that most software updates will have to be done by the dealer. This of course is absurd and just underscores what I learned living three years in Germany: the concept of Customer Service is completely alien to the German Culture and so is given no thought by their design engineers.
 

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Vast majority of automakers do not update all software over the air, especially firmware software. Through a partnership with Nvidia, MB is developing an entirely new software architecture expected to begin in some 2024 models which will have even more remote updates. Updating at dealers sometimes has it's own benefits though, like physical verification of the changes can be done, such as that the update is safely working using dealer equipment/expertise.

 

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Vast majority of automakers do not update all software over the air, especially firmware software. Through a partnership with Nvidia, MB is developing an entirely new software architecture expected to begin in some 2024 models which will have even more remote updates. Updating at dealers sometimes has it's own benefits though, like physical verification of the changes can be done, such as that the update is safely working using dealer equipment/expertise.

That is still absurd: why can Tesla do it’s almost weekly updates OTA, requiring no SC interface or contact, with no “verification“ problems but Nercedes can’t.
 

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Young risk-taking Tesla won’t have OTA all to itself forever especially if regulators understand it's value:

Wow. I assume you live in sclerotic overly bureaucratic economically under performing Europe. Fortunately, we are not that bad here YET and OTA is acceptable. So why doesn't Mercedes do OTA here? This is a major market, after all. There is a reason that, for the last seven years, the Tesla Model S has outsold the Mercedes S Class by an order of magnitude. One would think that Mercedes might be smart enough to do a little bit of best practices benchmarking against the industry leader in an effort to deliver a comparable customer usage experience. But I forgot that the very concept of customer service and customer convenience is completely alien to the German culture, as I learned living there for three years.

And of course, as the EQS doesn't let them soak the owner with $300 oil changes it is important to find new ways to feed dollars to that legacy dealer network [Mercedes pays the dealers for performing the updates] , an expense Tesla and the other American EV companies do not have, as dealers ADD NOTHING TO THE SALES OR SERVICE PROCESS AT ANY POINT.
 

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Flag is Ireland, Europe. I haven't looked into it much but Mercedes, in a search for the best new-gen architecture that will have huge implications, may have been in negotiations to establish cooperative agreement with other various automakers including VW BMW Tesla etc.



2 years ago new boss Ola Kallenius at Mercedes decided Mercedes should go it's own way instead, and is now in cooperation with a non-automaker, American Nvidia, for autonomous driving as well as OTA etc so the fruit of this will hopefully arrive by 2 year's time.

 
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