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Go Back   Bimmerfest - BMW Forums > BMW Model Discussions > 3 Series / 4 Series > E46 (1999 - 2006)

E46 (1999 - 2006)
The fourth generation 3 Series (E46 chassis) was introduced in 1999 and set the standard for engineering and performance during it's years of production including being named to Car & Driver's 10 best list every one of those years! ! -- View the E46 Wiki

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  #1  
Old 09-09-2012, 02:06 PM
nastar44 nastar44 is offline
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Location: Virginia
 
Join Date: Sep 2012
Posts: 4
Mein Auto: 2002 325XI
Battery-ABS-BRAKE Warning lights

Hello, I have a 2002 325XI that has a red Battery light, yellow ABS & Brake warning lights all on, and also possiblythe traction control light,(not really sure if that is always on or not) I did some troubleshooting today and found that the battery voltage was low, put in spare battery and the read voltage at the battery with motor and headlights radio all on, looks like alternator is not charging, would a bad alternator cause the other warning lights to be on, I did check brake pads, brake fluid all look good. Thanks for any help.
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  #2  
Old 09-18-2012, 10:05 AM
nastar44 nastar44 is offline
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Location: Virginia
 
Join Date: Sep 2012
Posts: 4
Mein Auto: 2002 325XI
Follow Up To My Issue

Pulled Alternator, (made my own "special" fan pulley tool", had first parts store test it and it passed???, stewed on that overnight and took it to another parts store where it passed 3 out of 4 tests, so I went with my original hunch to change the Alternator, That corrected the multiple warning lights which I figured was the computer telling me it was not happy with less than 12vdc. Runs like a Beemer again!! Yeah, Thanks for the helpful hints guys!!!
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  #3  
Old 09-22-2012, 12:20 AM
shaftdrive's Avatar
shaftdrive shaftdrive is offline
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Location: USA
 
Join Date: Mar 2005
Posts: 583
Mein Auto: 1999 K1200 & 2001 525
Quote:
Originally Posted by nastar44 View Post
Runs like a Beemer again!
The lights will be back on your bimmer because it's most likely the wheel speed sensors or the abs computer.
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  #4  
Old 09-22-2012, 03:37 PM
nastar44 nastar44 is offline
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Location: Virginia
 
Join Date: Sep 2012
Posts: 4
Mein Auto: 2002 325XI
Re:

So far so good, I think the problem was low voltage causing the ECU to lose it's marbles, The alternator was faulty and no warinng lights have returned with a full week of driving.
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  #5  
Old 10-09-2012, 06:41 PM
jsaklas jsaklas is offline
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Location: Maryland
 
Join Date: Jul 2011
Posts: 39
Mein Auto: 323i
I don't mean to hi-jack the thread, and this is related, but.....Is there anyway to know if an ABS speed sensor is bad, likewise with the ABS computer?
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  #6  
Old 10-09-2012, 09:45 PM
scarede46er scarede46er is offline
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Location: Clemson, SC
 
Join Date: Aug 2012
Posts: 161
Mein Auto: 2001 BMW 325i ZSP
Get the BMWScanner 1.4 offebay. Will tell you for sure. Else, it is a matter of taking each one out and checking impedance.
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