hurmeez

C250
BlueTec
~2015
Fob works (new battery)
Electric seats don't move
Lights don't go on (not even a glimmer)
Dashboard won't light up
Engine won't go on
Horn doesn't work
Received a green slip (road worthy certificate) last week
Has been used in the last 24 hours
New owners of this car (second hand), haven't had a Mercedes before. Are we doing something really stupid to prevent the car from working!
Desperately seeking solution!
TIA.

matt.jessop

Got to be the battery. Has it been particularly cold overnight ?

hurmeez

So it turns out that the battery was completely flat. Jump starting it didn't work, and it needed to be replaced. Mercedes roadside support replaced it with a new battery and all was fine again. Just bizarre that there is no warning about a flat battery ... you'd think that there would be some sort of warning light on the dashboard beforehand ... but not always it seems!

Thanks to those that replied on this and the other thread. Cheers!

Greg52

Sounds like a sudden failure of the battery rather than it going flat

Andy74

The car did not have the chance to warn you as I believe the battery suddenly failed. Mine hamers me with messages if i did not start the car in couples of days.

CaliBenzDriver

it sounds like the usual battery drain from sleepless computers unless battery was over the 5 years mark and expired with a bad cell.

Keep an eye on the main battery voltage and charge current and keeping battery floated (CTEK) is a reasonable policy.