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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 05-27-2014, 08:48 AM
The_Mixter The_Mixter is offline
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My ABS and ASC light comes on together

My ABS and ASC light comes on together. I've noticed on occasion when I'm at a slow speed and breaking(even lightly), I can feel the ABS working. This has occurred on dry conditions with no fault light on. I have not had a diagnostics done yet to find a fault code but I'm fishing for possible culprit. ABS module or sensor? I assume the ASC light comes as a default from the ABS issue.


Mickey

Last edited by The_Mixter; 05-27-2014 at 08:50 AM.
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  #2  
Old 05-27-2014, 09:23 AM
HTK12 HTK12 is offline
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Mein Auto: E39 540i
What is your cars production month?
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  #3  
Old 05-27-2014, 09:25 AM
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bluebee bluebee is offline
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Quote:
Originally Posted by The_Mixter View Post
My ABS and ASC light comes on together. I've noticed on occasion when I'm at a slow speed and breaking(even lightly), I can feel the ABS working. This has occurred on dry conditions with no fault light on. I have not had a diagnostics done yet to find a fault code but I'm fishing for possible culprit. ABS module or sensor? I assume the ASC light comes as a default from the ABS issue.
Everyone with an E39 has had what you described ...

For the ABS kicking in, see this thread:
- ABS kicking in on low speed braking on bumps (1)

For testing the wheel speed sensors, see this post:
- How to diagnose the BMW amber ABS BRAKE DSC/ASC trifecta or bifecta (1)

I'd suggest ignoring the fault codes, but read what I referenced to see why I say that.

For plenty more detail, see also:
- How to physically test & repair the Bosch ABS control module (1) & what are all known options when your ABS control module is bad (1) & why you want to only buy oem wheel speed sensors (1) & how to remove and replace the four BMW E39 ABS related WSS wheel speed sensors (1) & which wss innervates the speedometer (1) & explanations by 540iman as to why the fancy diagnostic tools always fail to properly diagnose the trifecta or bifecta (1) & where to get the fancy schmancy diagnostic tools for free once you're aware of their limitations (1) & why it's probably not the ABS hydraulic pump failing (1) & how to properly test the BPS brake pressure sensor (1) & how to properly test and replace the steering angle sensor (1) & Quick99Si's explanation of why the 10-minute wheel speed sensor diode-action quick test doesn't always work, especially on non-OEM wheel speed sensors (1) & what's this about the P0500 setting the SES (1) & why you want to wait a week before getting a smog test after removing your ABS control module (1) &, if you really want to try, how to attempt to disable the ABS/DSC but keep the speedometer and mpg cluster readouts (1)
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Each repair should invariably add to our knowledge base by the process of inexorable incrementalism.
Your job, in return, is to read the suggested threads, where the best people will always 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
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  #4  
Old 05-27-2014, 09:35 AM
The_Mixter The_Mixter is offline
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Location: Richmond, BC
 
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I'll have to get back to you with that date


Mickey
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  #5  
Old 05-27-2014, 11:23 AM
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helmet75 helmet75 is online now
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Mein Auto: 2000 528i 9/99
Mixter,
you can plug the last 7 of your VIN here and get it:
http://www.bmwarchive.org/vin/bmw-vin-decoder.html

Love that thing
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Looking for Parts for my E39- PM Me for wishlist and to deal!
2000 528i- Current Daily Driver and Project Car
2004 Pontiac Grand Prix GTP Comp G- 3.8 Supercharged. Sold to buy the BMW. Chipped, 27MPG, tons of torque.
2005 Pontiac Grand Prix GT- Traded in to get GTP. Electrical Hell.
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  #6  
Old 05-27-2014, 12:28 PM
alex5er alex5er is offline
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Mein Auto: e39 1997 528i
If your manufacture date is before September 1998 make sure you get OEM wheel speed sensors. Most aftermarket WSS will not work.


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  #7  
Old 07-19-2014, 04:22 PM
The_Mixter The_Mixter is offline
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So does anyone know where I can get an ASC ABS module?? Not DSC!


Mickey
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  #8  
Old 07-19-2014, 04:36 PM
alex5er alex5er is offline
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My ABS and ASC light comes on together

I have one for a 97 to 09/1998 528i. Are you sure it's the module because they do not usually go bad.


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Old 07-19-2014, 04:52 PM
alex5er alex5er is offline
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My ABS and ASC light comes on together

I cannot tell what year your 5er is. but if you have ASC it may be before 9/1998. So your ABS TC module will be under the glove box and not prone to the excessive heat as the DSC. Modules. I'll be more then happy to sell you my extra ABS T/C module. Cheep


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Last edited by alex5er; 07-19-2014 at 05:00 PM.
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Old 07-19-2014, 05:03 PM
alex5er alex5er is offline
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Quote:
Originally Posted by alex5er View Post
I cannot tell what year your 5er is. but if you have ASC it may be before 9/1998. So your ABS TC module will be under the glove box and not prone to the excessive heat as the DSC. Modules. I'll be more then happy to sell you my extra ABS T/C module. Cheep


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