[Robbe92]

So my e92 (2007_05) has a major electrical draw and I was doing a amperage draw test and I was at -49amps when the car was off I started pulling fuses and found that both fuse #40 and #20 were pulling close to 20A each. I don't know what exactly these fuses go to, can someone tell me what they go to exactly. Thank you in advance

[ctuna]

are you sure it wasn't .49 amps which is normal for an
awake car. (1/2 amp)
Do you have a picture of your meter while reading it?
What range was it on.
You should have a fuse map behind the glove compartment.

Or you may be able to find something useful in this link
(on the first and second lines)

https://www.bimmerfest.com/forums/at...9&d=1539905743

Also what is the problem you are trying to chase down?

electical e90 pdf
http://www.google.com/url?sa=t&rct=j...,d.cGU&cad=rja
http://www.google.com/url?sa=t&rct=j...85464276,d.cGU
http://www.google.com/url?sa=t&rct=j...85464276,d.cGU

[Robbe92]

The problem I'm chasing is my car while off would be at 12.4v when I first turn it off. I would come back after 2 hours of being parked my voltage was 7v and wouldn't start

[gbalthrop]

Originally Posted by Robbe92

So my e92 (2007_05) has a major electrical draw and I was doing a amperage draw test and I was at -49amps when the car was off I started pulling fuses and found that both fuse #40 and #20 were pulling close to 20A each. I don't know what exactly these fuses go to, can someone tell me what they go to exactly. Thank you in advance

As a physician would say: "The complaints are anatomically inconsistent."
Let's see where the wheels come off:

1) You have a 2007 328i E92?
2) That vehicle's build date was 05/2007 (May, 2007)?

Please be AWARE that E9x vehicles built in the period 3/1/2007 to 9/1/2007 had different fuse Layout from vehicles built BEFORE 3/1/2007, and had different numbering convention from vehicles built AFTER 9/1/2007

On a vehicle built DURING the period 3/1/2007 - 9/1/2007, here are the TIS circuit diagrams for F20 & F40:
https://www.newtis.info/tisv2/a/en/e...0-fuse/kVtAuzb
https://www.newtis.info/tisv2/a/en/e...0-fuse/l730eKH

Fuse F20 is 5A capacity, and Fuse F40 is 7.5A capacity, so if EITHER had 20A of current running through it, it SHOULD have blown. F20 powers the Control Circuit of the DSC & Transfer Case (you don't have X-drive I presume). F20 powers the Control Circuit of the Roof Function Contol Center (FZD). Bentley Fuse Charts confirm TIS data.

There are motors (~20A draw) which are powered via SEPARATE fuses and whose function may be controlled by the DSC or FZD, so it is possible that simply disconnecting a lower amperage control circuit/module fuse removes draw via a larger capacity Motor fuse.

Before we take the time to search the circuit diagrams for such a connection, and devise tests to determine where the fault lies, PLEASE CONFIRM the build date information above. If a battery with > 12.5V after shutdown goes flat in two hours, then your 40A draw range is consistent with that, but it would also be helpful if you would describe the tool and method you are using to measure draw.

BTW, Normal current draw after shutdown & going into sleep mode is in the range of .050 Amp (50 milliamps).

George

[gbalthrop]

As just posted in your other thread:

Originally Posted by Robbe92

Update I pulled the codes and had two transmission module fault codes

It would be helpful if you would provide:
1) the Fault Code numbers,
2) Any Definition of either Fault Code provided by your Scan Tool, AND
3) The brand & model of any Scan Tool or software you used.

Thanks,
George

[Robbe92]

Fault code U110F and U111A. I use a schwaben scan tool for bmw

[gbalthrop]

Originally Posted by Robbe92

Fault code U110F and U111A. I use a schwaben scan tool for bmw

Hey, it's NOT your fault that the Schwaben scan tool doesn't give ANY Fault Code DEFINITION for either of those codes. Was there even any Freeze Frame data that showed if the code was set with engine NOT running (RPM=0, Coolant Temp=Ambient, mileage=whatever when wouldn't start)? Another reason to use INPA/ISTA.

Here's the only site I could find ANYTHING about either of those codes, as far as DEFINITION, or what sensor signal (or lack of it) sets the code and under what conditions (algorithm ;-)
https://www.obd-codes.com/forums/viewtopic.php?t=12148

But then anyone who has ever used a scan tool for much KNOWS that a U-code is a communication error. So all I know is that a Bus communication Fault between modules occurred for some reason at some time. Battery voltage of 7 volts can do that and a lot of other strange things.

If those are your only two codes, and you don't have INPA/ISTA, my advice is forget the codes and find the battery drain. After correcting the battery drain issue, clear the codes and see if they EVER return.

For future reference, be aware that INPA will read information from the Power Module in the DME where records of "quiescent current" or parasitic amperage draw are kept. But you KNOW you have a major drain, possibly from TWO different sources, so forget codes (even INPA doesn't identify the component or circuit that has parasitic draw AFAIK) and let's identify the source(s) of the parasitic draw.

So if you'll provide/confirm answers to the two questions in my post #4 above, perhaps we can get on with properly identifying the source(s) of the battery drain.

George

[Robbe92]

Yes the car is a 2007 328i produce in 05/2007. I was using a bluepoint digital multi meter to check my draw on amps setting

[Robbe92]

Update the ibs was overloading everything and caused an internal short in my water pump

[gbalthrop]

Originally Posted by Robbe92

Update the ibs was overloading everything and caused an internal short in my water pump

I don't understand that diagnosis.

Please explain (1) what tests or codes suggest that scenario, and (2) HOW it could happen. Are you suggesting Alternator Overvoltage -- Output >15.0 V? What components have you replaced and what tests have been made since replacement?

Thanks,
George

[Robbe92]

Took it to a shop/specialist and they had it for two weeks and yes the alternator was being over charged and what they replaced was battery, water pump( which got ruined because of the overcharging) and ibs