All I know is, when the slip light flashes, it actually cut power to your rear wheel (as our car are rear wheel drive), so you feel the sudden deceleration. The VDC button is actually our traction control. But why it's coming on when you are just turning, I'm not sure. Some people also feel the that if turn into a corner to hard, the car understeer and VDC kicks in to control the slip on the front. They are wrong. The VDC only control the rear wheel, if you are on the brake while cornering, it's the ABS working. If brake is not apply, it will just continue to slid (understeer)