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E36 M3 (1992-1999) {Euro - S50 B32 321hp @ 7400 rpm} {U.S. - S52 B32 240 hp @ 6000 rpm}
Total Produced: 71,212 - Years Produced: 1992 to 1999


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Old Tue, May-31-2016, 01:46:01 AM   #1
riding_dirty
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Default My battery keeps draining overnight after messing with the OBDII Port

I have a parasitic batter drain issue. I just remembered that it started when I was in my car early one morning messing with the OBD scanner port with my laptop trying to get BMW Scanner tools 1.4.0 to work. Not the car wash. I remember it died the morning after and I had it jumped and then just had it jumped again yesterday. I wasn't able to get BMW Scanner to work on it.t. Had it jumped and it worked the alternator is working as well. But there is something that the water touched that's now drawing power from my battery. never had a single issue prior to this.

Last edited by riding_dirty; Tue, May-31-2016 at 05:08:15 AM.
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Old Tue, Jan-15-2019, 04:59:34 PM   #2
Kraftwerk
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Default Re: My battery keeps draining but don't know how

This happened to me as well no water, was just clearing the codes and it messed up the relay I think.. follow this thread:
https://www.bimmerforums.com/forum/s...-Stays-Engaged

is a Non M site E36 related could be the same issue?

No one ever responded to OP..'till now, so: did you ever figure it out? I will post what I find out.
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Old Tue, Jan-15-2019, 07:42:21 PM   #3
Braymond141
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Default Re: My battery keeps draining overnight after messing with the OBDII Port

Quote:
Originally Posted by riding_dirty View Post
I have a parasitic batter drain issue. I just remembered that it started when I was in my car early one morning messing with the OBD scanner port with my laptop trying to get BMW Scanner tools 1.4.0 to work. Not the car wash. I remember it died the morning after and I had it jumped and then just had it jumped again yesterday. I wasn't able to get BMW Scanner to work on it.t. Had it jumped and it worked the alternator is working as well. But there is something that the water touched that's now drawing power from my battery. never had a single issue prior to this.
PA Soft is a pile of shit software. The issue with it functioning one day and not the next, is pretty par for the course. We all go through it, we all want to pull our hair out.

Start focusing on proper hardware checklist items, like a battery test, bad grounds, etc. This is not related to your OBD software probing.
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Old Tue, Feb-05-2019, 02:45:36 PM   #4
Kraftwerk
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Default Re: My battery keeps draining but don't know how

This could be helpful information via spyderg0d @ Bimmerforums:

" If your icv buzzes then its bad. Period. If it buzzes with car on or off. The icv becomes internally shorted and will buzz whether or not the dme is powered. Happens frequently on all bmw models that take this icv. E36, e46, includeing the cross manufacture models like Volvo and Volkswagen. "


The thing never switches off and drains your battery.
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Last edited by Kraftwerk; Tue, Feb-05-2019 at 02:49:17 PM.
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Old Tue, Feb-05-2019, 03:35:24 PM   #5
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Default Re: My battery keeps draining but don't know how

Another possibility is the wiring loom on the trunk lid.
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Old Tue, Feb-05-2019, 03:46:22 PM   #6
Kraftwerk
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Default Re: My battery keeps draining but don't know how

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Originally Posted by idefo View Post
Another possibility is the wiring loom on the trunk lid.
Does it fray somewhere and short? Is the loom vulnerable to opening and closing or is it the switch?

give us a few more hints!
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Old Tue, Feb-05-2019, 04:24:34 PM   #7
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Default Re: My battery keeps draining but don't know how

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Originally Posted by Kraftwerk View Post
Does it fray somewhere and short? Is the loom vulnerable to opening and closing or is it the switch?

give us a few more hints!
It frays where it routes through the trunk hinge.
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Old Tue, Feb-05-2019, 06:49:14 PM   #8
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Default Re: My battery keeps draining but don't know how

..makes sense! thanks.
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Old Wed, Feb-06-2019, 11:34:16 PM   #9
M3AN
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Default Re: My battery keeps draining but don't know how

Isolate the problem before you start pulling stuff apart.

Set up your multimeter to check for current draw, use the fused connection on the MM. Car off, all lights off, all devices off, nothing in lighter socket etc, never crank the car or turn on a high current device. It's preferable to disconnect the trunk open switch (so no light) as well as the hood open switches (if the hood switches are connected to anything).
  1. Turn off all electrical load
  2. Disconnect negative cable from battery terminal
  3. Connect multimeter in series between the negative terminal and the negative cable closing the circuit
  4. Switch mm to current and connect terminals appropriately
  5. Measure current drain and remove fuses one by one until drain drops accordingly

Remove the fuses one-by-one until you notice a change in draw, write down the numbers and reinstall the fuse, move to the next fuse and repeat. It might take 20 mins to go through them all (I had to keep going from the back to the front of the car) but it's worth it.

You'll then have a list of fuses that result is draw, some will be negligible and acceptable (e.g. alarm as long as it's not high draw) but some should stand out. Then you can trace back from there...

Here were my results when I needed to chase the same thing...

Quote:
Baseline draw = 152mA (way too high)

Remove fuse #7 = 122mA (30mA draw)
Remove fuse #9 = 110mA (12mA draw)
Remove fuse #31 = 55mA (55mA draw)
Remove fuse #33 = 24mA (31mA draw)

And I think 24mA is a reasonable steady state draw (and it is).
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Last edited by M3AN; Wed, Feb-06-2019 at 11:39:36 PM.
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Old Thu, Feb-07-2019, 06:47:44 AM   #10
daytonaviolet
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Default Re: My battery keeps draining overnight after messing with the OBDII Port

I had a similar problem. I narrowed it down to the hood sensor. This is the sensor for the alarm which is located in the drug bin. If this is intermittent it will wake up the ECU every other minute and drain the battery.

To test it, just unplug the good sensor. Either the sensor or plug may be bad
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Discussing My battery keeps draining but don't know how in the E36 M3 (1992-1999) Forum - {Euro - S50 B32 321hp @ 7400 rpm} {U.S. - S52 B32 240 hp @ 6000 rpm}
Total Produced: 71,212 - Years Produced: 1992 to 1999 at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)