Welcome to Bimmerfest -- The #1 Online Community for BMW related information! Please enjoy the discussion forums below and share your experiences with the 200,000 current, new and past BMW owners. The forums are broken out by car model and into other special interest sections such as BMW European Delivery and a special forum to voice your questions to the many BMW dealers on the site to assist our members!

Please follow the links below to help get you started!

Go Back   Bimmerfest - BMW Forums > BMW Model Discussions > 7 Series / 8 Series > 7 Series - E38 (1995 - 2001)

7 Series - E38 (1995 - 2001)

Reply
 
Thread Tools Display Modes
  #1  
Old 10-04-2012, 08:43 PM
BimmerBro BimmerBro is offline
Mr_Bimmer
Location: Tampa
 
Join Date: May 2007
Posts: 47
Send a message via AIM to BimmerBro Send a message via Yahoo to BimmerBro
Mein Auto: 2001 Bmw 740i
mysterious battery drain?

I recently had to purchase a new battery and I'm experiencing a overnight drain. (the old one was just bad) I remember when I first got the car, leaving the cellphone connected would pull on the battery overnight. But I haven't had the phone connected in months. I had my alternator tested and found out it was faulty. It's been replaced. I don't drive this one every day, but may twice a week. Anyone know what else could be draining a perfectly new battery leaving the car a few days in the garage?

thanks
Reply With Quote
Advertisement
  #2  
Old 10-05-2012, 05:13 AM
chrisn7 chrisn7 is offline
Officially Welcomed to the 'Fest
Location: Huddersfield, West Yorks
 
Join Date: Oct 2011
Posts: 521
Mein Auto: 750iL
The phone module is certainly one possible culprit. Also check that when the car has gone to sleep that the fan in the climate control unit is no longer running. Leave the boot lid open, close the latch manually, and check that the 2 lights go out after 16 mins, and that the nav 'on' light has gone out too
Reply With Quote
  #3  
Old 10-05-2012, 04:41 PM
BimmerBro BimmerBro is offline
Mr_Bimmer
Location: Tampa
 
Join Date: May 2007
Posts: 47
Send a message via AIM to BimmerBro Send a message via Yahoo to BimmerBro
Mein Auto: 2001 Bmw 740i
When you say leave the boot lid open, what does this mean? Also what two lights do i need to check for? The navigation "on" light. Does that mean the LCD display?

Sorry, but want to try your advice immediately. Not sure what else would pull on the battery overnight.
Reply With Quote
  #4  
Old 10-05-2012, 09:46 PM
BMWFatherFigure's Avatar
BMWFatherFigure BMWFatherFigure is offline
Old School
Location: Perth, Western Australia
 
Join Date: Aug 2012
Posts: 2,368
Mein Auto: E23;E30;E38;E32;E34 +
He means LEAVE THE BOOT OPEN but trigger the lock so the body computer THINKS IT IS CLOSED. Wait 16 mins (or there abouts) and check the COURTESY LIGHTS in the boot have gone out. If that tests good test for actual battery drain current and start to disconnect permanently connected items until the drain stops.
__________________
Good - Fast - Cheap: Pick any two.
Current:
E23 735i; E32 735iL (X 2 - 1 Alpine White and 1 Glacier Blue); E34 535i; E38 735iL; R50 Cooper; R55 Cooper Clubman.
Previous:
E21 318i; E30 318i; E32 735iL; E34 535i; E38 730iL; E53 4.4i
Reply With Quote
  #5  
Old 10-06-2012, 06:43 AM
joyism5's Avatar
joyism5 joyism5 is offline
Officially Welcomed to the 'Fest
Location: USA
 
Join Date: Jan 2011
Posts: 1,270
Mein Auto: '99 740IL, K75RT
Check the light next to the shift level, if is going out after 10-15 min. after you park the car Check the operation of the windows, interior lights, sunshade lights,alarm, central locking,windshield wipers, as they might indicate a culprit in the GM III (general module). Also navigation, radio issues?
Also do you have a correct battery replacement?
A nice DIY for battery drain: http://meeknet.co.uk/E38/E38_Battery_Drain.htm
or: http://meeknet.co.uk/E38/BMW_E38_Ele...l_Gremlins.htm
Credit to Tim for his nice website: http://meeknet.co.uk/E38/Index.htm

Some other reference:
http://www.bimmerfest.com/forums/sho...=battery+drain
http://www.bimmerfest.com/forums/sho...=battery+drain
http://www.bimmerfest.com/forums/sho...=battery+drain
http://www.bimmerfest.com/forums/sho...=battery+drain
__________________
JOY = BMW

Last edited by joyism5; 10-06-2012 at 06:50 AM.
Reply With Quote
  #6  
Old 10-06-2012, 11:49 AM
QSilver7's Avatar
QSilver7 QSilver7 is offline
Officially Welcomed to the 'Fest
Location: Northeast Indiana
 
Join Date: Aug 2008
Posts: 5,896
Mein Auto: 1997 740iL / 2006 X5 4.4
Quote:
Originally Posted by BimmerBro View Post
When you say leave the boot lid open, what does this mean? Also what two lights do i need to check for? The navigation "on" light. Does that mean the LCD display?

Sorry, but want to try your advice immediately. Not sure what else would pull on the battery overnight.
BOOT & bonnet are the Euro English words for "trunk" & "hood"....just as lift = elevator & *** = cigarette. Some of the other former or remaining British colonies may use those terms as well.

The "nav" unit is in the trunk and has a (I believe) red LED that illuminates when the unit is on...check to make sure that the LED on the nav unit itself (not the car's monitor in the dash) turns off when the car goes to sleep. It takes 16 minutes for the car to go into sleep mode. If you activate a door handle, window, or push any of the buttons on the remote...you will "WAKE" the car up...extending the time for the car to go to sleep.

As mentioned above, the little light next to the gear shift is another indicator as to when the car has gone into SLEEP mode.


__________________
Q {BMW CCA Member #191509}
2006 E53 X5 4.4i (Sterling Gray) 12/05 mfg date <<~>> 97 740iL (Arctic Silver) 3/97 mfg date
(SOLD)
99 540iT (Orient Blue) <<~>> 95 525IT (Alpine White)
91 735iL (Schwarz Black) <<~>> 85 325e (Bronzit)

http://imageshack.com/scaled/grid240/822/e38e532ndsigpic.jpg

Last edited by QSilver7; 10-06-2012 at 11:55 AM.
Reply With Quote
  #7  
Old 10-06-2012, 07:27 PM
BimmerBro BimmerBro is offline
Mr_Bimmer
Location: Tampa
 
Join Date: May 2007
Posts: 47
Send a message via AIM to BimmerBro Send a message via Yahoo to BimmerBro
Mein Auto: 2001 Bmw 740i
Awesome instructions. Now this spells it out for me nicely! I will be trying this in the morning.

thanks!
Reply With Quote
  #8  
Old 10-06-2012, 11:02 PM
BMWFatherFigure's Avatar
BMWFatherFigure BMWFatherFigure is offline
Old School
Location: Perth, Western Australia
 
Join Date: Aug 2012
Posts: 2,368
Mein Auto: E23;E30;E38;E32;E34 +
Sorry - didn't realise the hood/bonnet - trunk/boot thing. You US chaps should learn the Queen's English...................
__________________
Good - Fast - Cheap: Pick any two.
Current:
E23 735i; E32 735iL (X 2 - 1 Alpine White and 1 Glacier Blue); E34 535i; E38 735iL; R50 Cooper; R55 Cooper Clubman.
Previous:
E21 318i; E30 318i; E32 735iL; E34 535i; E38 730iL; E53 4.4i
Reply With Quote
  #9  
Old 10-07-2012, 06:12 AM
joyism5's Avatar
joyism5 joyism5 is offline
Officially Welcomed to the 'Fest
Location: USA
 
Join Date: Jan 2011
Posts: 1,270
Mein Auto: '99 740IL, K75RT
Will try mate!
__________________
JOY = BMW
Reply With Quote
  #10  
Old 10-07-2012, 05:26 PM
BMWFatherFigure's Avatar
BMWFatherFigure BMWFatherFigure is offline
Old School
Location: Perth, Western Australia
 
Join Date: Aug 2012
Posts: 2,368
Mein Auto: E23;E30;E38;E32;E34 +
__________________
Good - Fast - Cheap: Pick any two.
Current:
E23 735i; E32 735iL (X 2 - 1 Alpine White and 1 Glacier Blue); E34 535i; E38 735iL; R50 Cooper; R55 Cooper Clubman.
Previous:
E21 318i; E30 318i; E32 735iL; E34 535i; E38 730iL; E53 4.4i
Reply With Quote
  #11  
Old 10-08-2012, 01:37 PM
chrisn7 chrisn7 is offline
Officially Welcomed to the 'Fest
Location: Huddersfield, West Yorks
 
Join Date: Oct 2011
Posts: 521
Mein Auto: 750iL
Quote:
Originally Posted by BMWFatherFigure View Post
Sorry - didn't realise the hood/bonnet - trunk/boot thing. You US chaps should learn the Queen's English...................
Nice to remind our US chums of the origins of their language sometimes....
Reply With Quote
Reply

Bookmarks


Forum Navigation
Go Back   Bimmerfest - BMW Forums > BMW Model Discussions > 7 Series / 8 Series > 7 Series - E38 (1995 - 2001)
Today's Posts Search
Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off



Forum Jump


All times are GMT -7. The time now is 01:39 AM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
© 2001-2011 performanceIX, Inc. All Rights Reserved .: guidelines .:. privacy .:. terms