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Go Back   Bimmerfest - BMW Forums > BMW Model Discussions > 5 Series > E39 (1997 - 2003)

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 03-20-2013, 04:15 AM
Makomagnet Makomagnet is offline
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E39 DSC works, but can not switch off

I have bmw e39 2001 525 and DSC light is not coming on when i press the DSC button, however when i switch the ignition on yellow triangle light comes on and goes off which how it should be. can any one help me.
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  #2  
Old 03-20-2013, 06:58 AM
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QSilver7 QSilver7 is offline
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Is this a new development or has it been like this for a while? And if it's been a while...did it occur around the time some other work or other malfunction/change/upgrade/mod occurred?

If you have diagnostic software/hardware, you could always hook it up and communicate with the control modules to see if there's a fault code registered...anything other than that will be a guess at what it could be if there's no other signs or symptoms that might lead us in some direction.
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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
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  #3  
Old 03-20-2013, 07:23 AM
Minimal BMW Minimal BMW is offline
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i had the same problem with ASC, an it was the ABS module problem, one very very thin wire was damaged in abs module
sorry for English
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  #4  
Old 03-20-2013, 06:21 PM
Makomagnet Makomagnet is offline
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QSilver7 thanks for the reply. A couple of years ago I replaced the LCM and it was not coded. Could that be the issue? As I remember I've been having this issue for a couple of years.

I don't have the tools to interrogation the software you mention, and I'm sure no one else went in there.

Any suggestions that may help identify where the problem is ?

Last edited by Makomagnet; 03-20-2013 at 06:23 PM.
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  #5  
Old 03-21-2013, 12:19 AM
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mjalloul11 mjalloul11 is offline
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Did you try another switch? could be the reason why it wont shut down . The DSC will always stay on and only the switch can turn it off, or if something is wrong with it and then the light on the dash will be on all the time.
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  #6  
Old 03-21-2013, 12:36 PM
Makomagnet Makomagnet is offline
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I replaced the switch from a junkyard. No change. The strange thing was they were different part numbers. When I look up on real OEM it shows the part number I picked at the junkyard, not the previous switch. At one time it did work with the old switch.
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  #7  
Old 03-21-2013, 07:01 PM
senser senser is offline
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Your master cylinder could be low on brake fluid.
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  #8  
Old 03-22-2013, 03:16 AM
Makomagnet Makomagnet is offline
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I just purchased another switch off of EBay but will check my brake fluid this weekend.

Low on brake fluid could do that ?

It's worth a try
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  #9  
Old 03-22-2013, 11:26 AM
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mjalloul11 mjalloul11 is offline
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Wont a low brake fluied triger the light on the dash?

Sent from my GT-I9300 using Bimmer App
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  #10  
Old 03-27-2013, 03:14 AM
Makomagnet Makomagnet is offline
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Installed new DSC switch hoping to toggle DSC system, switch made no change. It's not a bad switch.
What else is there ?
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  #11  
Old 03-27-2013, 10:37 PM
senser senser is offline
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Quote:
Originally Posted by mjalloul11 View Post
Wont a low brake fluied triger the light on the dash?

Sent from my GT-I9300 using Bimmer App
Yes, the light that's triggered is the DSC light. Nothing else. When the master cylinder gets low the DSC light will be solid on.
I did a full brake flush using the pressurized method and a few bottles of BMW brake fluid and the light went away for good.

Last edited by senser; 03-27-2013 at 10:40 PM.
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  #12  
Old 03-28-2013, 12:54 AM
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mjalloul11 mjalloul11 is offline
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There is a red light in the dash a circle with doted lines around, it lights up when the pads are worn or the brake fluied is low .
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  #13  
Old 03-29-2013, 06:42 PM
Makomagnet Makomagnet is offline
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Not brakes, not fluid level, not DSC switch. Is there a fuse or harness I can check the the switch is sending a "turn off" signal ?
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  #14  
Old 03-30-2013, 01:12 PM
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QSilver7 QSilver7 is offline
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Quote:
Originally Posted by Makomagnet View Post
Not brakes, not fluid level, not DSC switch. Is there a fuse or harness I can check the the switch is sending a "turn off" signal ?
I think there may be multiple fuses due to there being underlying systems that work with DSC. Check the front fuse box (there should be a pull out fuse index card when you open the fuse flap in the glove box) and the rear fuse box (should be a fuse index on back of battery compartment door) and look for anything that has to do with ABS, ASC (automatic stability control), and/or DSC/DBC (dynamic stability control/dynamic braking control).

Again, there may multiple areas that a fuse related with traction control can be since ABS/ASC/DSC/DBC all work in conjunction with one another (not all e39s may have all of the systems aforementioned).

(e39 glove box fuses)




Check fuses #17/#30/#31
__________________
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; 03-30-2013 at 01:18 PM.
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  #15  
Old 03-31-2013, 09:03 AM
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bmw_n00b13 bmw_n00b13 is offline
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Quote:
Originally Posted by Makomagnet View Post
QSilver7 thanks for the reply. A couple of years ago I replaced the LCM and it was not coded. Could that be the issue? As I remember I've been having this issue for a couple of years.
You think?! LCM needs to be coded for at least the mileage.

Get the codes read; too many options to guess. Extremely common. http://www.bimmerfest.com/wiki/index...S_Control_Unit
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  #16  
Old 03-31-2013, 03:14 PM
Makomagnet Makomagnet is offline
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Qsilver7. Thank you for the information and experience.

The DSC switch now works. Fuse # 17 was missing and nothing was there. I replaced it and it now works as designed.

What is the amperage of the red fuses ?

Thank everyone who contributed

Last edited by Makomagnet; 03-31-2013 at 03:15 PM.
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