hello everyone, hope u all are doing well.
I have a 2011 c300 have used it for 2 years now with no issues.
about 2 months ago had water leaking in due to a clogged sunroom drain..
ended up with puddle of water under driver side carpet. cleaned it up and dried it out.

yesterday I was at the gas station and went over some unexpected bump that cause car to bottom out a couple of times (oopsss)
felt no issue and went home. as I put turn signals I noticed that they did not work, 2 secs prior air bag and sos lights came on,
the horn or wipers did not work.

I removed the carpet and found 2 plugs one with 4 wires and they other one with 5 wires on it that seem to have some of the wires corroded.
I went and replaced them one by one.
then noticed the long plug with a bunch on 2 wire plugs going in, that seemed to have some corruption as well.
as I'm moving the wires around somehow i lost power cause now the car will not turn on and when I turn the key nothing happens, the only dash light I have is the cluster light when you open the door.
but when I turn the key nothing happens...

my scanner is showing U118200 "The chassis CAN network Management is unstable"

anything I should try?
thanks, already looked at all fuses and swapped so relays to see if that was the issue but no luck.

 

Replace the corroded plug strips there should be 3 of them. They for the CAN bus

 

hi thanks for the reply, I replaced the white one, my local dealership was out of the other two (brown one)
now all the srs, and all that went away. my issue now is that when inserting key it turns but no ignition lights at all.
also no click on when inserting the key. I tried another mb key and it still turns but with that other key it said that key is not for car so it does recognize its key.

playing with the ignition key on the run position I went and removed fuse #27 from the hood (electric steering lock control unit, electric ignition lock control unit.
after removing it and put it back on I noticed that all lights went on on dash as normal when starting it. I went and tried to crank it but no go.
I den removed the key and tried again but back to square 1, no lights at all besides the dash center light that turns when u open the door.

I repeated the prices again the key on on position and got the dash to light up by removing and immidiately putting back fuse 27.
this time I added a wire from the battery + to a slot on the starter relay (green) and the car started right ap and I removed the wire....
car continued to run fine no faults but as soon as i turned it off with key and tried to crank again I get no dash light or crank unless I repeat the above steps.

also the N relay (engine circuit 87 relay) randomly clicks even when key is out and door s closed.

another thing when removing key from ignition that main click that locks the ignition is gone that's why I was able to turn it with another key but somehow I here like 3 light clicks coming from behind the dash every time I remove they key....

helpful tip, the rail CAN BUS plug, part number 00-4546-82-40, on local dealership website the price said $16.00
but when I went to buy it the clerk said it was $36. I challenged him and said that they website said $16 so he gave me a "discount" and I got it for the $16.

THIS IS MY ONLY CAR SO ANY ADVICE WOULD BE HELPFUL.

wondering if replacing the other 2 CAN BUS rails would help.....

THANK YOU

 

Do a short test first and check for CAN faults! If your issue is that the ESL will not unlock then most likely your ESL has failed and needs to be repaired or replaced

 

I don't think is the ESL, I simply can't get power to it
I did scan and got:
u020100: communication with the left rear door control module is faulty
u023100communication with the rail/light sensor (RLS) is faulty.
u016900 communication with the overhead control panel (cop) is faulty

I don't see how these are preventing power to my ignition lights on dash.
I order the other 2 CAN BUS strips.

also replaced all relays and checked ll fuses

I don't get it

 

I have same exact problem. Been pulling esl fuse to start car and drive. But when rains or carwash car will suddenly shut off randomly. And after few hours or a day will start right back up again with pulling fuse27. Did you have any luck with replacing plugs?