- Mercedes-Benz E-Class: Warning Lights
Important information to help you understand your Mercedes-Benz
Red battery message ( Visit workshop)
I got a red message in the car cluster saying (Visit workshop) with the battery picture in it.
Well the ignation and the lights are working very well, once I swtich on the car and turn it off then switched back on, the message comes back on. The car I drive is 2004 E320, do I need to change the battery and which one the auxillary one under the hood or the main one in the trunk ?
Any help will be really appreciated, I am sure somebody has gone through this ordeal.
Thanks

Voltage regulator or Battery Control unit..Both KNOWN Problems on the early W211s...Very easy to check charging system
Call MB Roadside if its Still Under MB Warranty
Have your dealer check VMI (Vehicle Master Inquiry - have your VIN handy) to see if there are any outstanding recalls or service campaigns all are covered by MBUSA even out of warranty.
Service campaign 2005070017 APR06 addresses alternator
e320 (211.065) VIN range A014562-A734487, X097696-X116123
2005060008 JUN06 addresses battery control unit, A014562-A418838
DTB P-B-42.46/84 NOV07 VIN range A040665-A589444 the cause may be the result of damage to the engine or interior compartment wiring harness underneath the auxiliary battery. The harness contains the supply line for the auxiliary battery relay.
Lastly, it could be the auxiliary battery relay needs replacement.
Last edited by konigstiger; Dec 12, 2008 at 10:27 AM.
If the car drives fine otherwise, my money is on the Aux. Battery!
Gary
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If the car drives fine otherwise, my money is on the Aux. Battery!
Gary
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Your best bet is to take it in and have correctly diagnosed. Daignosing a warning light w/o codes over the internet is like asking "How much is food in a can?"
Last edited by mescaline; Dec 13, 2008 at 06:52 PM.

Gary
Anyone have any idea how long for delivery?
I have done some research on a generic replacement. Today I went to a autozone and they had a direct fit/spec bat but it was acid version not the AGM. I tried to get the clerk but service as usual with young lady clerk
and young guy customer
. So for the record.
The factory part is mfg by FIAMM
They have at their website a direct replacement bat but the terminals are slightly different. Down side is not easily available in US.
The best change was for a
WESTCO 12B-4 in the AGM version. But you must have the square top post for both vertical and horizontal mount. Many will only have the horizontal post.
Second option is DELCO GTX 14-BS but no one local had this one.
Walmart has one the size ES12BS and but don't know if it is gell cell (agm) or lead acid.
Didn't have time to get to Walmart with all the returns going on today.
So I do believe there is a generic that will fit at a lower cost. But for the $total $115.74 delivered to the door with exact part number it was no longer economical to spend my time looking. Only down side is I have to wait for delvery and wanted to install it today. (Taking a 1000 mile trip next 10 days so hope the order arrives)
Interesting the procedure for installing the aux bat.
1) It requires disconnect main bat in trunk
2) Then replace aux.
3) Follow specific reconnect procedure for install main bat or possible damage to bat relay
So I was a bit suprised that the main bat can't just be reconnected after being disconnected. But then ocassionally I do learn something new. Happy New Year to all and be safe
. vettdvr
So I was a bit suprised that the main bat can't just be reconnected after being disconnected. But then ocassionally I do learn something new. Happy New Year to all and be safe
. vettdvrIt is in the shop manual.
Edited and very short.
A) Be careful don't short anything and don't get hurt
Disconnect ground from main bat. in trunk. See A)
Open hood remove a/c cover to get to the aux bat.
Disconnect ground from aux bat. See A)
Disconnect + lead. See A)
Remove stuff as necessary to get the bat out. See A)
Install aux bat reverse of above. See A)
But since you disconnected the main bat there is a procedure to prevent damage to the battery control unit.
Connect main bat ground See A)
Turn ignition on. (note here don't start the engine)
Turn on driving lights
Turn blower to MAX high
Turn on rear window defogger
Turn on hazard flashers
After MINIMUM of 2 minutes start vehicle.
There may be a fault message "brake defective" in the steps but the manual gave no direction here.
So I did not give you all the don't drop, short, burn etc. If you really need these details I recommend you buy the manual. Part # P-2700-211-06 from MB.
If I missed any item feel free to add what I might have missed. I have not attempted to 100% copy the manual but only provide the critical steps that may help you.
So for folks considering purchasing from www.parts.com beware they have this restriction and will not ship Part# 2115410001 the aux battery for the Mercedes.
I told them to cancel the order as they will not ship. I will really take this into consideration next time I purchase MB parts.
I have all the data and now the search is on to find a generic replacement we can buy at the local autozone/walmart store.
Last edited by vettdvr; Dec 26, 2008 at 06:14 PM.
Last edited by konigstiger; Dec 26, 2008 at 04:09 PM.
So for folks considering purchasing from www.parts.com beware they have this restriction and will not ship Part# 2115410001 the aux battery for the Mercedes.
I told them to cancel the order as they will not ship. I will really take this into consideration next time I purchase MB parts.
I have all the data and now the search is on to find a generic replacement we can buy at the local autozone/walmart store.

http://cgi.ebay.com/ebaymotors/Power...Q5fAccessories
The pic shows a group size 12 but in the description it states it's a 14-BS and gives the dimensions.
Last edited by E500 AMG Sport; Dec 26, 2008 at 11:59 PM.
http://cgi.ebay.com/ebaymotors/Power...Q5fAccessories
The pic shows a group size 12 but in the description it states it's a 14-BS and gives the dimensions.
Looks great to me. I can see no reason why that would not work.
There are several stages for shutdown of consumer devices if the system and aux batteries are low in charge.
The normal voltage is 12.6V or above for the system battery. If it drops to 12.3V, it will show a warning some convenience consumer devices will be shutdown. If it drops to 10.4V, it shuts down the system battery, the aux battery takes over. There is a long list of items to check if there are warnings. The alternator, the system battery, the aux battery, the battery sensor, the relays and fuses.
The recommended procedure is to follow the DAS MB STAR which will invoke the WIS net to diagnose.
What I just seen are ad-hoc methods.





