W211 Battery

[jwills]

I recently had a new battery fitted in the boot but the 'battery protection' message has come up again. Do I need to change the starter battery in the front? If where is the best place to get hold of one.

Many thanks

 

[BlackC55]

Is it the correct battery?

There is a battery control module that may need the software updating too. Get the front battery tested before replacing and also test the alternator and for current drains. It should be no more than 0.06A when locked. The best place for one is MB.

 

[mr. shr]

How can you check if the battery control module has had the software update?

Is it dealer only or can anyone with a STAR machine do it?

 

[rascalmaster]

... Also make sure there are no loose terminals. Mobilo life came out to my last car as it was coming up with batt. Protection messages; traced it to a loose connection in the rear battery.

 

[jwills]

Thankyou for your responses. The new rear battery is a Bosch S3 008 fitted by an independant so I hope this is the right one. Will check leakage and connections.

 

[KEITH1965]

Hi just noticed your query about battery
I have e320 cdi avantgarde (211)
I dont want to sound like a numpty but I have replaced my battery in the boot nd noticed you were asking bout starter battery in the front where abouts is the starter battery located in the front

 

[Diesel Benz]

Hi just noticed your query about battery
I have e320 cdi avantgarde (211)
I dont want to sound like a numpty but I have replaced my battery in the boot nd noticed you were asking bout starter battery in the front where abouts is the starter battery located in the front

The starter battery is at the trunk. A pre-facelift W211 would have the small AUX battery at the engine compartment but this is not used for starting the engine.

 

[A210AMG]

^ SO when I started by S211 using the battery in the boot this is OK or not?

I would have never thought to look for just some terminal points under the bonnet, I opened the bonnet spotted no obvious battery so though right..lets look in the boot.

 

[Diesel Benz]

^ SO when I started by S211 using the battery in the boot this is OK or not?

I would have never thought to look for just some terminal points under the bonnet, I opened the bonnet spotted no obvious battery so though right..lets look in the boot.

Quite OK to connect to the battery at the trunk. Actually this is basically the only option for sedan models (I guess they assume a wagon would likely be loaded and the battery would not be reachable).

 

[gIzzE]

It says in the manual to use the jumper points in the bonnet.
There is protection then to some of the modules in the car, I know on BMWs and Audis you can fry some of the ECUs by jumping the battery direct.

Merc manual....

The jump-start contacts are located in the engine compartment.
Make sure the two vehicles do not touch.
Turn off all electrical consumers.
Apply the parking brake ( page 62).
Make sure the gear selector lever is set to position P.
Open the hood ( page 324).
Practical hints
Jump starting
Start the engine of the disabled vehicle.
You can now turn on the electrical con- sumers. Do not switch on the headlamps under any circumstances.

Remove the jumper cables first from negative terminals on each battery and then from the positive terminals on each battery.
1 Negative (-) terminal 2 Cover of positive (+) terminal
Open cover of the positive terminal.
Connect positive terminal 2 and the positive terminal of the charged battery with the jumper cable. Clamp cable to charged battery first.
! Never invert the terminal connections! Start engine of the vehicle with the
charged battery and run at idle speed.
Connect negative terminal 1 and the negative terminal of the charged battery with the second jumper cable. Clamp cable to charged battery first.
You can now switch on the headlamps.

Have the battery checked at the near- est authorized Mercedes-Benz Center.

 

[A210AMG]

Not being funny but honestly how many people would read a manual to te you how to jump a battery?

Never heared of it have to say so learn something new everyday

 

[Diesel Benz]

It says in the manual to use the jumper points in the bonnet.
There is protection then to some of the modules in the car, I know on BMWs and Audis you can fry some of the ECUs by jumping the battery direct.

Your advice is good but are you claiming that the ECU protection behaves differently towards jump start cables on the jump poles versus cables connected to the battery? And what sort of protection are we talking about in addition to the standard fuse/overload/reverse polarity protection at any control unit?

Some ECUs are sensitive but there is a huge wire between the jump pole and the battery and you cannot make any real difference to the voltage seen by different ECUs when the jump cables are connected, irrespectively of which contact points to use.

And how do you explain the difference with Sedan models versus Estate models? A W211 (Sedan) does not have jump start poles at the engine compartment.

 

[A210AMG]

^ That picture is exactly how I started my S211 (confused now as BlackC55 who ownes a garage posted I shuldn't have jumped it that way??)


I stand by what I said and surely 99% of people who have a flat battery with these cars would not check a manual but jump it the same way I have jumped any other car I have owned?

 

[gIzzE]

When I was talking about protection that is what it says in the BMW manual, that you should always use the jump points under the bonnet to protect some of the electronic modules in the car.

I got that info above from the "Sedan" manual, not the estate.

 

[Diesel Benz]

When I was talking about protection that is what it says in the BMW manual, that you should always use the jump points under the bonnet to protect some of the electronic modules in the car.

I got that info above from the "Sedan" manual, not the estate.

I have not looked at the BMW manual and I don't think I will.

I did mention the figure was from a Sedan manual. Are you claiming that the Estate wiring and ECU protection is different from that of a Sedan (in addition to the jump start poles)? My claim was that the jump start poles at the engine bay on an Estate are a convenience issue, not that it would make any difference for ECU protection to use the battery or the jump poles for jump starting.

I'd be interested about the physical explanation for the difference and generally about the assumed ECU protection, would make discussion easier.

 

[joecash]

I know this is not a newish thread, but i have a 2004 e320 cdi. does it also have a second battery under the bonnet? If so can anyone shed any light on where it is? I have looked but I cant see any sign of one. Mind you I am a little "thick" on these matters.
Joe

 

[mersum1es]

Yep. Info here:
http://www.mercedestechstore.com/pdfs/W211_advisor/219 HO Dual Battery (ACB - ICC) 11-29-02.pdf

 

[joecash]

mersum1es,
thanks once again
you are a font of knowledge
Joe