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      12-26-2011, 05:08 AM   #1
MattUK
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Overactive DSC?

On my regular run to the office on certain road surfaces and over some bridges the DSC light flashes quite often. Having come from an M3, I never recall seeing the DSC light flash that often, and this isn't really driving it hard.

Curious to know if others (especially in the UK with our roads) see their DSC light coming on quite often?

I've yet to venture down to driving in Sports Plus as I've not really read up on how much it changes the boundries of where DSC would kick in.
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      12-26-2011, 09:30 AM   #2
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I have noticed that DSC can become active when driving over rough or poorly paved surfaces or when you have a sudden drop associated with a hill and a little bit of speed...

With the exception of it disabling cruise control (normally this happens below cruise control speeds for me) I consider this to be a "good" thing. Why? The common belief that stability control and traction control are bad and good driving don't need them. This is so far from the truth! These technologies were developed in F1 and so enhanced the vehicle that it really didn't matter who was driving the car. DSC and DTC modulate the car in ways the driving isn't even capable of (such as braking an individual wheel).

The DSC / DTC on the X3 seems very good to me. Activating with the slightest hint of traction loss indicates thst the system is highly sensitive and quick to respond... both desirable. DSC on the keeps the vehicle stable without (overly) stripping forward momentum or removing the driving pleasure. If you are driving in a wide open area with no concern of collision turn all the driving aids of and see how big of a difference it really makes.

Again, despite the common belief, I would argue that the DSC would make even the best drivers in the world would be faster around a track in the X3.
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      12-26-2011, 11:51 AM   #3
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Did your M3 have runflats? DSC light is a regular companion even on our 118d (with runflats)... never seen it on the Q5.
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      12-26-2011, 12:09 PM   #4
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Newer BMWs have new programming in their computers that let you know via the DSC light on the dash that the car is unable to optimize stability and traction at a given moment. This happens when going over clustered bumps because there is a fraction of a second when the wheel is in the air between the crest of the bump to its trough. When there are lots of bumps, it flashes when going over them to let you know that for each time a wheel is up in the air, the stability control system cannot keep the car perfectly stable. On ice and mud as well, the wheels skid intermittently regardless of the tires you use, so in between all wheels having traction to when one or more wheels has absolutely no traction, the DSC light flashes to let you know the system cannot work to its full potential.
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      12-26-2011, 12:11 PM   #5
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Your old BMWs' systems still responded the same way, but the code for the dash light was more conservative, if you will.
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      12-26-2011, 01:33 PM   #6
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Could be the front wheels going light over bridges and setting off the DSC. With rear drive only it wouldn't have been an issue
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      12-27-2011, 02:02 AM   #7
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Thanks for the feedback.. M3's don't have runflats no
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      12-28-2011, 11:01 AM   #8
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WOT even in 3rd can sometimes trigger the DTC light and bad road surfaces do it too. Normal probably
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