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Old 12-24-2008, 10:43 AM
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Location: San Francisco Bay area
Join Date: Jan 2005
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Mein Auto: '05 545i
Originally Posted by jcl10 View Post
That isn't what DTC is for. The confusion starts with the BMW labelling system for warning lights and the button.

In normal state, no lights, you have DSC (Dynamic Stability Control) and DTC (Dynamic Traction Control), by default. DSC helps with sliding, DTC puts a brake on to stop a wheel from spinning. There is a low system threshold for a spinning wheel, meaning the system (nanny) intervenes quite early.

Pushing the button once turns off DSC, but keeps DTC on. It allows more wheelspin than the standard setting (fewer nannies). This is designed to be used if you try to get going at slow speeds and the road is so slippery that you have no throttle response, ie the computer is limiting throttle because of wheel spin. Allowing some wheel spin can get you up a hill or get you moving sometimes when the system would otherwise stop you. Once you are moving, it is worth putting turning DTC off (back to normal state) for most drivers.

Holding the button for longer turns everything off. Good for track days, or playing around in parking lots to find out the limits of your car.
Your description (other than holding the button for a while turns off both DSC & DTC) is not correct--at least vs. how it works in my car.

Don't touch the button: DSC is on (prevents wheel slipping when starting off, and provides stability in corning).
Press button once: DSC still on, but DTC now on (which allows some slipping of wheels, to facilitate starting in snow, for instance). But DSC still being on means you still have cornering stability system on.
Press and hold button for 10 secs.: both DSC & DTC off
2005 545i - sold

Last edited by stream; 12-24-2008 at 10:50 AM.
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