Question about 1998 Mercedes-Benz E-Class

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Running down battery when parked for a day without usage

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  • ben2005onos Sep 06, 2010

    What can be done to stop the problem

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If you decide to disconnect the battery, then you have to go to MB to get the radio code. If they do not have the code you have to pay an radio technician to recode.
The procedure of disconnecting the battery is:
Disconnect negative terminal first, then positive.
Reconnect new battery positive first then negative.
If you decide to charge the battery on the car, which we do not recommend, use a smart charger, first in normal cycle, and after EQUALIZING cycle which last more than 12 hours.
A charged battery with terminal voltage below 12.6 Volts is not considered in good status. Soon or later you must buy a new battery.

Posted on Sep 05, 2010

  • 1 more comment 
  • global1207 Sep 05, 2010

    f you decide to disconnect the battery, then you have to go to MB to get
    the radio code. If they do not have the code you have to pay an radio
    technician to recode.
    The procedure of disconnecting the battery is:
    Disconnect negative terminal first, then positive.
    Reconnect new battery positive first then negative.
    If
    you decide to charge the battery on the car, which we do not recommend,
    use a smart charger, first in normal cycle, and after EQUALIZING cycle
    which last more than 12 hours.
    A charged battery with terminal
    voltage below 12.6 Volts is not considered in good status. Soon or later
    you must buy a new battery.

  • ben2005onos Sep 06, 2010

    What is MB. How can a 100amps 12v battery run down in 24 hrs? Thank for your response.

  • global1207 Sep 07, 2010

    The MB is Mercedes Benz dealer. I am sure that you must replace the battery for that reason I gave you the information. There is no doubt you have a battery leak. Disconnect the wire harness from positive pole of the battery. Connect a 12 volts / 1 amp bulb between them. Use aligator clips to avoid sparks, or computer might e damaged. For first 15 minutes system sinks 1 amer because computers switch, in learning mode, but after the current should drop to miliampers.
    If light doesn't go off, pull off fuses, one by one. If light goes off, then you find the problem. To find the amount of leak, replace the light bulb with a multimeter set at 10 Ampers mode. A stop at AutoZone might help. They scan codes for free, and provide a print out of code explanation.
    The final is a visit at Mercedes Benz Dealer, for a check and advice ONLY, for about $100. I hope this might help. I had same problem with a Cadillac Sevile SLS, all the tests resulted negative, dealer could not find the problem. The alarm system was turning lights on and off during the night at 2 - 4 am, a new $150 battery cured the problem. Good luck.

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There's always a small amount of drain on the battery for the ECM, alarm, etc, but if draining bad within 24 hours you either have something live not wired correctly and drawing or possible short of a positive. An ASD relay that shuts off the car in case of a wreck or ECM tells it can go bad and lock into giving power to the engine nonstop and will drain that fast. Overnight it wont start the next day. This relay might also be called MFI. It has an always live 12v  on one part even when car is turned off.

Posted on Sep 05, 2010

  • 10 more comments 
  • dncholas
    dncholas Sep 06, 2010

    Never worked on a Benz but I would first have someone check the relay. It's called either ASD, MFI or many refer to as "main relay". This relay is grounded by ECM and then supplies power to everything. They usually do not go bad or lock in constant power but can and one of the few things on a car that can do this. Ignition relays go bad but usually only stop giving juice to engine and accessories but can short out over time and allow a short. If you have an after market stereo with amps they may be draining if not properly wired up. Other than that a simple short anywhere can cause that. The ASD/MFI relay is usually a dealer part so not easy to get, ignition switch is easy but would cause you other problems usually. You probably just have a short. I'd guess something between ignition and relays. If you had other symptoms it would help to narrow down.

  • ben2005onos Sep 06, 2010

    what is ASD and ECM and where are they located. Thanks for your concern.

  • dncholas
    dncholas Sep 06, 2010

    It may be called something else but a mechanic will know what you are talking about if you say the "main relay" or "auto shutdown relay" and no clue where it is on a Benz, I just know how electronics works on cars. Japanese mostly. The ECM is the computer but also called ECU or PCM as well. Usually under dash or behind radio or glove box. Some are in engine compartment but I doubt on yours.

    It could simply be the battery sucks and can't hold a charge. If you have a multimeter or voltmeter check the volts on the battery and then start car and test while running. Should be above 12v off and close to 14v running. If less then the alternator is not charging very well and may be going. A bad cell in the battery would cause it to not charge correctly.

  • ben2005onos Sep 13, 2010

    My auto electrician have isolated a module; Siemens B41991-B5478-Q5 made in Germany 02.95 located below the accelerator pedal that fail to shut down current thereby allowing drain of battery by electrical drain. Now, my concern is what will be the side effect of this action on the performance of the car if not replaced . Thanks for your prompt response and assistance.

  • ben2005onos Sep 13, 2010

    My auto electrician have isolated a module; Siemens B41991-B5478-Q5 made in Germany 02.95 located below the accelerator pedal that fail to shut down current thereby allowing drain of battery by electrical drain. Now, my concern is what will be the side effect of this action on the performance of the car if not replaced . Thanks for your prompt response and assistance.

  • ben2005onos Sep 13, 2010

    My auto electrician have isolated a module; Siemens B41991-B5478-Q5 made in Germany 02.95 located below the accelerator pedal that fail to shut down current thereby allowing drain of battery by electrical drain. Now, my concern is what will be the side effect of this action on the performance of the car if not replaced . Thanks for your prompt response and assistance.

  • ben2005onos Sep 13, 2010

    My auto electrician have isolated a module; Siemens B41991-B5478-Q5 made in Germany 02.95 located below the accelerator pedal that fail to shut down current thereby allowing drain of battery by electrical drain. Now, my concern is what will be the side effect of this action on the performance of the car if not replaced . Thanks for your prompt response and assistance.

  • ben2005onos Sep 13, 2010

    My auto electrician have isolated a module; Siemens B41991-B5478-Q5 made in Germany 02.95 located below the accelerator pedal that fail to shut down current thereby allowing drain of battery by electrical drain. Now, my concern is what will be the side effect of this action on the performance of the car if not replaced . Thanks for your prompt response and assistance.

  • ben2005onos Sep 13, 2010

    My auto electrician have isolated a module; Siemens B41991-B5478-Q5 made in Germany 02.95 located below the accelerator pedal that fail to shut down current thereby allowing drain of battery by electrical drain. Now, my concern is what will be the side effect of this action on the performance of the car if not replaced . Thanks for your prompt response and assistance.

  • ben2005onos Sep 13, 2010

    My auto electrician have isolated a module; Siemens B41991-B5478-Q5 made in Germany 02.95 located below the accelerator pedal that fail to shut down current thereby allowing drain of battery by electrical drain. Now, my concern is what will be the side effect of this action on the performance of the car if not replaced . Thanks for your prompt response and assistance.

  • ben2005onos Sep 13, 2010

    My auto electrician have isolated a module; Siemens B41991-B5478-Q5 made in Germany 02.95 located below the accelerator pedal that fail to shut down current thereby allowing drain of battery by electrical drain. Now, my concern is what will be the side effect of this action on the performance of the car if not replaced . Thanks for your prompt response and assistance.

  • dncholas
    dncholas Sep 14, 2010

    Not sure what that module is but I figured something was pulling constant current. I could only guess what it does but must have something to do with throttle, maybe the position or whether it's engaged or not. I know Japanese cars but German is very different. I'm assuming you're uplugging this module to stop the current so see how it runs without it is my modo when all else fails with sensors. It might possibly give a dash CEL though. The best thing is always to fix what you know is wrong. The ECM wants all of it's sensors and best to have all of them. Also be very careful when unplugging sensors because the signal wire can short the ECM if the signal spikes or it contacts anything with over 5 volts. I'd replace it.

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