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 01-28-2013, 06:39 PM
Renard Renard is offline
Registered User
Location: Madera CA
 
Join Date: Jan 2013
Posts: 6
Mein Auto: 740IL
Unhappy 1998 740IL Lost power to the onboard monitor, radio and sunroof only

All of the other systems work fine including a/c, electric steering wheel etc. All fuses are fine front and back. Any ideas?

January 31, 2013
A service shop, (not a BMW) in my area check the car and came to the conclusion that the reason why my systems are cutting down is because my battery is not producing the 900 amp output it needs to crank the car. Therefore, the computer begins to shot down systems to allow the car to start. He said I should replace the battery and all the problems will be gone. I check the battery and the eye is black even though the car starts as normal. Any counter advice?

Last edited by Renard; 01-31-2013 at 08:58 AM. Reason: UPDATE
Reply With Quote
Ads by Google
  #2  
Old 01-28-2013, 09:45 PM
BMWFatherFigure's Avatar
BMWFatherFigure BMWFatherFigure is offline
Old School
Location: Perth, Western Australia
 
Join Date: Aug 2012
Posts: 2,171
Mein Auto: E23;E30;E38;E32;E34 +
Ignition switch. PM me.
__________________
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
  #3  
Old 01-29-2013, 09:28 AM
Renard Renard is offline
Registered User
Location: Madera CA
 
Join Date: Jan 2013
Posts: 6
Mein Auto: 740IL
Thank you PM

Should I replace the switch and key as well?

Renard
Reply With Quote
  #4  
Old 01-29-2013, 04:30 PM
BMWFatherFigure's Avatar
BMWFatherFigure BMWFatherFigure is offline
Old School
Location: Perth, Western Australia
 
Join Date: Aug 2012
Posts: 2,171
Mein Auto: E23;E30;E38;E32;E34 +
Neither.
__________________
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 01-29-2013, 07:53 PM
Renard Renard is offline
Registered User
Location: Madera CA
 
Join Date: Jan 2013
Posts: 6
Mein Auto: 740IL
What do you suggest as a fix? I disconnected the battery for a few minutes and connect it again. The radio and onboard monitor started working again, however the sunroof did not.
Reply With Quote
  #6  
Old 01-29-2013, 10:34 PM
JasonSC540ia JasonSC540ia is offline
Officially Welcomed to the 'Fest
Location: Alamogetto NM
 
Join Date: Aug 2009
Posts: 649
Mein Auto: 1999 740i
Just as BMWFF suggested. Ignition switch. You can replace or clean. You dont have to change your key. PM BMWFF as he suggest. Hes got a pretty good method for cleaning.
Reply With Quote
  #7  
Old 01-29-2013, 10:39 PM
Renard Renard is offline
Registered User
Location: Madera CA
 
Join Date: Jan 2013
Posts: 6
Mein Auto: 740IL
Thank you. I will
Reply With Quote
  #8  
Old 02-03-2013, 08:43 PM
Kevin Halbleib Kevin Halbleib is offline
Registered User
Location: Louisville
 
Join Date: Oct 2011
Posts: 95
Mein Auto: 740il
clean

How do you clean the switch?
Reply With Quote
  #9  
Old 02-04-2013, 08:48 AM
QSilver7's Avatar
QSilver7 QSilver7 is offline
Officially Welcomed to the 'Fest
Location: Northeast Indiana
 
Join Date: Aug 2008
Posts: 5,677
Mein Auto: 1997 740iL / 2006 X5 4.4
I'm lost. Why not check the health of your car's battery as originally suggested? You can unlock your OBC and do TEST 9 (if you don't have a multi-meter). If your battery's voltage is at 11.89 volts (or below)...it is at 0% state of charge...which means the original suggestion is accurate.

It doesn't cost a thing to unlock your OBC and only takes a minute or two...and once the OBC has been UNLOCKED...you can check your battery in less than 20 seconds. (see video below)

Low battery voltage can cause weird electrical gremlins...just as the original suggestion...the car will go thru a sort of "rolling brown out" shutting down non essentials to keep the car running.



__________________
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; 02-04-2013 at 08:59 AM.
Reply With Quote
  #10  
Old 02-04-2013, 11:34 AM
Renard Renard is offline
Registered User
Location: Madera CA
 
Join Date: Jan 2013
Posts: 6
Mein Auto: 740IL
Hello QSilver7

Thank you for the reply. I did replace the battery and all the on the OBC and radio problems are gone except that the sunroof does not open. The fuse is fine and the sunroof was working fine before the other problems started. What do you suggest?

Thank you in advance
Reply With Quote
  #11  
Old 02-04-2013, 01:16 PM
QSilver7's Avatar
QSilver7 QSilver7 is offline
Officially Welcomed to the 'Fest
Location: Northeast Indiana
 
Join Date: Aug 2008
Posts: 5,677
Mein Auto: 1997 740iL / 2006 X5 4.4
Quote:
Originally Posted by Renard View Post
Thank you for the reply. I did replace the battery and all the on the OBC and radio problems are gone except that the sunroof does not open. The fuse is fine and the sunroof was working fine before the other problems started. What do you suggest?

Thank you in advance
After electrical interruption ...the sunroof requires reinitialization. See the instructions from the owners manual (see far right column POWER LOSS OR MALFUNCTION:

__________________
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; 02-04-2013 at 01:17 PM.
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 06:33 PM.


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