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Chad Farhat
Chad Farhat, ASE Certified Technician A6 - Electrical / Electronic systems A7 Heating / Air conditioning systems
Category: Mercedes
Satisfied Customers: 6223
Experience:  Owner at Carolina Auto Service & Sales , 20 years experience in Foreign & Domestic vehicles
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My 2003 E320 battery dies overnight. I have just replaced

Customer Question

My 2003 E320 battery dies overnight. I have just replaced both batteries but it still dies. Someone told me it might be the battery control module, what are the signs that this is the problem
JA: Have you tested the battery with a voltmeter? And can you see if it's leaking or not?
Customer: Yes and it is not leaking.
JA: Are you fixing your E320 yourself? What have you tried so far?
Customer: Yes
JA: Anything else you want the mechanic to know before I connect you?
Customer: I just put in new batteries.
Submitted: 8 months ago.
Category: Mercedes
Expert:  Chad Farhat replied 8 months ago.

Hi, I'm Chad. Welcome to JustAnswer. I'm reviewing your question and I will be posting your reply ASAP.

Expert:  Chad Farhat replied 8 months ago.

Hey how are you ,I will Try to Help you with This Issue

Can you run this test below

https://www.wikihow.com/Find-a-Parasitic-Battery-Drain

or

and You will need a Capable Mercedes Star Factory scanner or equivalent to Read the Fault codes in All Modules needed and based on these faults we can pull up a Pin Point Troubleshoot and be Accurate ,If you get the Faults Read ,post them back here for me and I can Help You Further on it & we be Accurate

and correct the Battery control module is a common issue and not the only issue , so with out testing we end up throwing parts at it

BUT CLICK ON LINK TO VIEW PDF FILE SHOWING YOU THE BATTERY CONTROL MODULE LOCATION, CHECK ELECTRICAL CONNECTOR ON IT AND WIRES, CHECK FOR ANY BACKED OUT PINS MAKING POOR CONNECTION, BUY SOME CRC ELECTRICAL CONTACT CLEANER ,SPRAY CONNECTION AND RETEST

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