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E39 (1997 - 2003)
The BMW 5-Series (E39 chassis) was introduced in the United States as a 1997 model year car and lasted until the 2004 when the E60 chassis was released. The United States saw several variations including the 525i, 528i, 530i and 540i. -- View the E39 Wiki

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  #1  
Old 10-14-2012, 06:37 PM
mcalic mcalic is offline
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Location: connecticut
 
Join Date: Nov 2008
Posts: 19
Mein Auto: 2001 530i
Abs module and battery disconnect

My abs lights have been on for for some time now on my 2001 530i. I had the abs remove and sent to aotoxpresstech which fix the problem for a short time. I removed the abs module to send it back for repairs but did not disconnect the battery before removal. I put the abs module back on after repair but it has not worked. Is it possible that the module does not work because I did not disconnect the battery before removal? Or does it matter eaither way? I have contacted bba and they have agreed to look at it. Please let me know if I have to disconnect the battery.
Thanks
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  #2  
Old 10-15-2012, 08:19 AM
ultrevex ultrevex is offline
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Location: Atlanta, GA
 
Join Date: Sep 2008
Posts: 87
Mein Auto: 1999 528i
Quote:
Originally Posted by mcalic View Post
My abs lights have been on for for some time now on my 2001 530i. I had the abs remove and sent to aotoxpresstech which fix the problem for a short time. I removed the abs module to send it back for repairs but did not disconnect the battery before removal. I put the abs module back on after repair but it has not worked. Is it possible that the module does not work because I did not disconnect the battery before removal? Or does it matter eaither way? I have contacted bba and they have agreed to look at it. Please let me know if I have to disconnect the battery.
Thanks
I asked my tech the same question, his answer was ' Eh, just don't have the ignition switched on when replacing the module.... duh!' I did not disconnect the battery, mine works fine.
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  #3  
Old 10-16-2012, 11:23 PM
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bluebee bluebee is offline
Seek to understand,^Value
Location: San Jose, California
 
Join Date: Mar 2008
Posts: 19,190
Mein Auto: 02 BMW 525i M54 automatic
Almost nobody disconnects the battery before removing or replacing their ABS control module.

Nothing wrong with doing so - and the 'formal' instructions say do to so ... but almost nobody does it.

Muuuuuuuuuch more detail here:
- How to diagnose & fix the ABS DSC (or ASC) BRAKE trifecta (1)
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Note: Your mission, should you decide to accept it, is to add value to those threads, either by pictures or by descriptions, so the next person with the same problem stands on your shoulders.
See also: E39 Bestlinks & How to easily find what you need, in seconds!

Last edited by bluebee; 10-16-2012 at 11:25 PM. Reason: Added picture
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