Mbsjones

I just bought this car a few days ago w 28k miles. At the time, no noticeable problems. But when I got home, I turned the engine off and turned the car back on the play around with the features (while engine was off). Two minutes later, the radio shut off, a weird clicking noise commenced, the command center went dark, I got all kinds of error messages on the dash, and the interior lights went off. I then turned on the ignition, and all was well again.

Ever since, the car goes to sleep after 4-5 minutes of idleness. The keyless entry does not work. When I manually unlock the door, none of the interior lights come on. Only when I start the engine does everything come back. But once the engine is turned back off, car falls asleep again within 5 minutes. I actually sat in the car during this process, and I could hear what sounded like a system shutdown after 4 mins, at which point, I'd open the door, and no lights would turn on.

I read a similar thread suggesting the main or auxiliary battery may be dead. Just wanted to get confirmation that this was the same issue. Very disappointing this was not discovered a few days ago at dealership, but I guess I couldn't expect them to tell me something I should've tested more thoroughly prior to purchasing.

Any suggestions/advice would be much appreciated. Thanks

Mbsjones

Please help. I'm a first time poster and getting pretty nervous about my car situation. I emailed the dealer, and as expected, I'm getting radio silence back. Please offer any assistance you can. Thanks

tusabes

Hi there
This is the w 220 forum for the 1999-2006 sclass
Your car is the w221 body

But I can tell you what you are describing sounds completely normal as the older w220 does the same thing. After you turnoff the car , the electronics power down and you can hear all the computers shutting down

You need to restart the car to turn everything back on

lylesr33

I have a 550 and this does seem normal with the exception of error messages appearing. I believe you have a weak battery. As mention, move this to the W221 section to see if someone else has had this happen.

Mbsjones

Thanks for the responses. Sounds like auxiliary battery is dead. Going to take to dealer this week. Thanks again.

Ctrixx

I have a 2007 S550 with roughly 85k miles. Recently the car's computer system has been resetting while I am driving on the highway. The entire command/nav system and even headlights turn off then turn back on as if I was just starting up the car. I also feel a stiffness in my steering wheel as the car is resetting itself. All the while my speedometer/tachometer light cluster and other gauges stay illuminated . On some occasions when the command shuts down my Esp/Abs lights will come on over the dash and then it will recycle itself off. No issues with the engine while driving but this is a very concerning issue. MB Dealership could not find anything.
This all happens at different times while driving. Sometimes it's about 10 or 15 minutes into driving. Mainly it doesn't appear to follow a constant pattern. Sometimes I can drive for an hour with no issues. I have seen a similar situation on YouTube with another owner of a S550. It's like my car has a ghost in it. Someone please HELP ME!
Does anyone know of any similar problems with this vehicle OR any advice?

Ctrixx

Did you ever find out your problem? I'm having similar issues.

Benzman33

Wrong section vato...

tusabes

Battery is probably old and weak

Ctrixx

THIS IS THE FIX FOR YOUR S550......
I'VE SPENT SO MUCH MONEY TRYING TO FIGURE THIS OUT 4 DIFFERENT CAR DEALERSHIPS. EVERYONE WANTS TO BLEED YOU DRY IF YOU OWN A MERCEDES BENZ. THE WORLD IS SO MONEY HUNGRY!
THE FIX....... POWER SUPPLY CONTROL MODULE ECU MERCEDES W221 S550 S600 S1965, 2007-2009
PART NO. 2215400401
http://www.ebay.com/itm/POWER-SUPPLY-CONTROL-MODULE-ECU-MERCEDES-W221-S550-S600-S65-2007-09-2215400401-/301616469538?rmvSB=true

Joe Ruiz

can’t find it on my 09 Mercedes s550 for the life of me please where is it at the supply control module please

Ctrixx

What’s your contact information?

Joe Ruiz

u can hit me up 7027476494

bino135

what was the issue?