victorgraur

Hello i got my car week a go (W221 2009 4Matik) from first day on my screen was Red message "Battery Not Charged" couple my friend told me is AUX battery but problem is my car have only One battery in front is nothing in the trunk where is suppose to be battery is empty and no wire for battery so never been there a battery.


My front one is after market(not OEM Mercedes) something with 75AH this one also work good and hold power


also i take out small battery under dash check and this one is working good and it hold power





So my be you can suggest me which battery is good for my car or what is the problem.


i have no problem with start and all working good





also my steering wheel buttons on left side don't work also from begin. i though is because red message but now i thing is not





any advices ? or HELP? Please Thank YOU





I have MB STAR if you need something i can give to you quick test on STAR don't give me any error

DaveW68

If you have the small battery under the hood, then that is the starter battery. Your aux battery would be located behind the panel that is behind the rear seat on the right. Not an easy change-out for that battery or easy to get to.


If everything inside your car works fine....and your keyless go is always working fine along with interior lighting when the car is not started, then the error is likely referencing the battery in your key....which might need replacing soon.

victorgraur

This is screen




i check my car also dealer say my car have only one battery, also today i got OEM battery ordered by my VIN number, and same thing

also i check true MB STAR buttons on the steering wheel and all are working but i cant do nothing on the screen its show me only what you can see on picture

DaveW68

Try removing positive and negative connections, clean the terminals, then reattach and make sure they are ver tight. It's also possible that you may need to have the battery re-registered to the car.

victorgraur

i did cleaning
How to register batery ?


Please HELP guys

wywywywy

The facelift model only has one battery.

So what are the voltages at the battery terminals, with the engine on and off?

It's possible that the alternator is failing.

victorgraur

Engine off 12.5v
Engine on 13.9v

wywywywy

The engine on voltage is slightly low.

It's worth looking into the voltage regulator I think.

victorgraur

MB STAR say should be 13.4V - 14.5V when is on so my its in range I don't thing also voltage regulator can do something with steering whel buttons , also I founded on this forum couple more people's with same problem and no answer from them if they fix it.

https://mbworld.org/forums/s-class-w...ml#post6377694

sakodik

Alternator issue! Is your engine making a whiny supercharged sounding noise when you gas it? That was a sign on mine that it was failing, but still charging!

All 2010+ models have only one battery in the front now? Did not know that...

victorgraur

No noise evrething is normal and all working.

victorgraur

PROBLEM SOLVED

Just update IC software to last one and evrething come good nothing else.

thanks to all guys who try to help me

just1time

glad you got your problem solved. out of curiosity tho, you mentioned your car is an 09 but only has one battery?
thats news to me. i thought they all had 2 batteries. Even the facelift models.

victorgraur

Hello this is my data card Look at A57

https://mbworld.org/forums/attachmen...x59a271038.pdf

After Facelift then come with one battery (don't know about all) my for shore and it OEM battery 95AH 850 CC. This is original data.

wywywywy

Which module's software did you have to update? The front SAM?

victorgraur

i didant have chance to update SAM first i did IC and all start working so i stop it

El-Roubi

I have the same issue , tried to update the IC but no new software found.

any recommends ?

DaveW68

Oh....so you drive a "Mercedes". That should make it easy to diagnose.

Alex4493643

I have same problem after replacing battery. How do you update IC software?

konigstiger

Try this: Start DAS - Information and Communication - IC- Instrument Cluster (Central CAN Bus) - Control unit programming.... - follow the DAS prompts to update the software on the instrument cluster.

2010 221 216 MBUSA released service campaign 201201003 to update IC software due to communication issues. Have dealer check VMI (vehicle master inquiry) to see if update applies to your VIN and confirm it was installed if not, update is free - see attachment.

gev2000

how do u update the software?