ANYONE HELP PLEASE

mercedes s class 2006

when I switch my ignition on after a few seconds everything turns off sometimes flickering and car won’t start. If I turn ignition and engine on straight away it works and stays on. Anyone know anything about this or had this problem before?
thanks

moved to W221 forum...

not heard of this error before

BUT I'd start out checking BOTH batteries - these cars use so much current just to get the ignition switch on in the run position, its not funny
I wonder if there's a feature to try and get the car to start and do the cluster off the front battery when the back one is as good as dead

behind the rear seats (accessed via the boot) is a massive 23kg battery that does all the interior stuff and they are often forgotten
get the trim out and stick a volt meter across both batteries if either are less than 11.5 V sort that before wasting time on complex stuff

Looks like the ignition switch is playing up ,

Probable bad battery or batteries...... If consumer battery in trunk is more than 9 years old, consider replacement. If starter battery under hood is more than 4 years old, consider testing voltage. BOTUS has written about ways to revive a consumer battery if you want to try. After checking voltage also scan for codes. W221 is particularly sensitive to low voltage.

I don't have WIS in front of me; how is it supposed to work? Does a contactor connect the starting battery at the moment engine crank is requested? At ignition on? What if the starting battery is low, is it able to use the aux battery to crank? If the aux battery is dead, will it couple in the starting battery? I think the answer to that last question is no, by design. Signs point to a bad aux battery that was probably going back for years but since it doesn't crank the engine, the symptoms kind of hide (until it doesn't even have enough to connect the starting battery briefly, which needless to say is WAY too late).

I only knew my aux battery was failing because my dome lights would shut off with the doors open. Oddly the car never seemed to complain in another way.

Interior Lights automatically cut out after x minutes (feels like up to 7 to me), there is actually a later software iteration for the UCP that cuts the Interior Lights in daylight using the rain light sensor info. But its diagnostic capability is less than another update that leaves them on like the original

I'm talking like under 30 seconds. Or 20 seconds. Not normal.

My 05 CTS-V didn't run the dome lights during the daytime out of the box. Really threw me off until I realized what it was doing.

I was watching a youtube video where he called it a dome light - yet he was looking at the footwell lighting, when he said it - and as car's don't have a single dome in the middle any-more - its rather odd that inaccurate name stuck in the USA...

they are interior lights and (door and boot open-warning lights)

My 2003 Hyundai Elantra was running fine and dandy. This evening, I was sitting in my vehicle with the motor off paying attention to the radio for a couple of moments. At the point when I turned the way in to the beginning position, there was a tick and all lights switched off. Then, at that point, quiet. After a little, the lights would return on regularly, until I turned the way to "begin" once more.




192.168.100.1 192.168.1.1

If I say "dome lights" literally every US citzen knows what that means. As you probably know, we aren't too focused on "proper" things and in many cases you won't get too far with a lecture about it. But it's entertaining and we can all get along so it's all good.

I agree this site is far better than most at being polite and sensible (in my experience its something to do with the Merc theme, as the other one I go all behave well too...)

this is meant to come from an entertainment / learning perspective - rather than a rant - but in your words its contains the fuel that tips Brits over the edge - till they go into tell mode...

much of the world has been through many thousands of years of fighting, rectifying, learning, growing, debating, reasoning, resolving and standardising stuff till it was all pretty well sorted. How and why we all got here was the due to the hard work, genius and stubbornness of thousands of years of work across many countries, where their foremost intellectuals debated and developed sound reasons for most things... hundreds if not thousands of years later a disgruntled, less well educated bunch struggled to set up a new colony they called America. As the world unified on English as a global language, it meant they were lucky enough to have this as their first language. And then the evils of marketing got in the way, and rather than assisting quietly offering a voice of reason and support - it seems its just dragging the world sideways with mistakes - and we risk one small country inflicting the wrong way of doing nearly everything on everybody - whereas there was a better more sensible way that's wrongly being forgotten