ZG

Zoran G.

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Parasitic drain | BMW

Hello,

I have had a parasitic drain for a while now.

When the vehicle is parked, a 100 Ah battery lasts about 2 days, then it is empty and nothing works without jump starting.

How do I check this?

Already checked

Parasitic drain description

#Electrics

BMW

💬16

Solution

Zoran G.

After removing the basic module, I measured everything again. The parasitic draw is now gone.

Does anyone have an address where I can have the basic module checked?

Thanks

Comments (16)

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  1. Serhat

    Please measure the battery's quiescent current. It should be around 5-40 mA. If it's higher, pull the individual fuses one by one to check which fuse causes the value to drop. Before doing that, close the car and open the driver's door, then use a screwdriver to latch the lock.

    7
  3. Franz K.

    Check the quiescent current as written; the ammeter should show no more than 0.02 - 0.05 amps, if I remember correctly.

    The vehicle should be locked or in quiescent state. It takes between 2 and 15 minutes for everything to shut down.

    If you have more, pull one fuse after the other (but plug it back in immediately) until the current consumption drops. Then you know exactly which part is drawing power 👍🏼

    The Auto Doctors have also made one or two videos about this 😉

    2
  4. Franz K.

    Just saw it, you were faster 👍🏼😉

    2
  5. Matthias P.

    Otherwise, you can also use the multimeter to measure how many millivolts are flowing at the fuses.

    Regards

    2
  7. Matthias P.

    Now measure the voltage drop

  8. André B.

    Rethink this statement! Nothing about it is correct.

    1
  9. Matthias P.

    So what exactly is wrong with measuring voltage drop??

  10. Stefan H.

    Had the same problem. The power amplifier was defective.

  11. Hartmut K.

    Do you have heated door handles?

  12. Hartmut K.

    Forget the hint. The reference to the Car Doctors is already below.

  13. Zoran G.

    I have now run the circuit to the rear to the navigation drive + computer and locked the car without the alarm system. Result after 30 min. See picture for the result. I will remove the navigation device in the next few days and disconnect it from the power. I didn't get far with the fuse box - not even with the radio, as this fuse is really only for the radio operation and not for the display with the on-board computer, which was still running after the fuse was pulled. Thank you all for your tips and I hope I find what I'm looking for soon. ;)

  14. Zoran G.

    No, I have not.

  15. Zoran G.

    After checking all possible components, it turns out to be the base module. Can anyone recommend someone who can repair something like this?! Thanks for your support

  16. And R.

    No need to rethink anything. This is how you measure the hidden consumer without waking them up.