G'day, My name is Marko and I am from Perth in Western Australia. Thank you for letting me be a part of the MBWorld forum. I purchased a 2003 Mercedes E500 ( W211). I have noticed in the past 3 months my airmatic suspension from the back wheels of the driver's side and passenger's side is very low when it is parked and not being used. Sometimes it stays up and sometimes it goes down when parked and the engine is not running. I get the warning saying my vehicle is too low, so I wait for approximately 30 seconds and it goes away and the airmatic suspension pumps it back up. It doesn't happen all the time but sometimes. I will get around to changing both airmatic suspensions but I come across another issue.

My main battery went completely flat as I didn't drive the car for 4 days, So I changed the main battery. after 2 days of not driving the car, the battery went flat again. I only noticed that I also have an auxiliary battery in the front which I went to battery world and they said it needed replacing. If I start my car every day, I have no issues. As soon as I don't drive for 24 hours, I get an error saying 'battery protection convenience not available' on the cluster which goes away after driving my car for a while which I believe charged up the auxiliary battery.

My main issue is what is draining my main battery? could it be the airmatic suspension keeping the car afloat when not running be draining both my batteries? Could it be a faulty battery module control? or possibly the compresser is pumping the airmatic suspension? or does the compressor use the auxiliary battery?

any advice would be greatly appreciated. I am going to purchase a new auxiliary battery and buy 2 sets of airmatic suspension kit.

I owned this car for approximately 12 months

Thank you
Marko

 

How do I post that I am new?

 

Welcome to the forum Benzfarken.
Well, when the auxiliary battery is bad, it is going to drain the main battery. The auxiliary battery is the one responsible for maintaining the memory of the comfort module (mirrors, seats, climate control, transmission preferences, etc.). When replacing it, you should leave the drivers door open to maintain this memory for at least 2-3 hours, even if your main battery is disconnected.
About the airmatic, it seems that you have a problem with the control valve, but is better to test al the system with a Star Diagnosis scanner.

 

machadosl Thank you very much for replying so quickly. I had a feeling the Auxiliary battery was an issue and played some part in draining the main battery.
I will go to a mechanic that specializes in European cars and have a test with a Star Diagnoses scanner. I am hoping its something minor so i dont have to spend too much money on replacing both struts. Although it has never been replaced and the car is coming close to 20 years of age

 

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Please visit Instagram profile of my babe IG: s6_c63_limited_edition

 

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Welcome Tomasz. Awesome C63! Thanks for sharing the photos

 

Hello,

I have now changed the Auxiliary battery and the main battery, all brand new. I leave my car overnight in the garage for 12 to 24 hours and cannot start the car. Completely dead, I cannot even turn the ignition with the key. Something is draining the battery or could i have a fault in the Battery Control Module?

 

Nice ride! I like the red sideview mirrors.

 

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Handsome vehicle -- enjoy!

 

many thanks...

 

Looks great James. Congratulations and welcome to MBWorld

 

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Congratulations on that sweet ride, Tara -- enjoy it!

 

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