Lets Say the light is burned out. If your slipping say in the wet with the ASR on And Switch is off. You should feel the brakes being applied slightly. When you switch off your ASR button the yellow triange does not come at all? you could have a bad bulb?
It needs to be certain your feeling the the ASR work. Take a hard right hand turn somewhere just hammer the throttle around that turn. If you feel no resistance at all in drivablity then,you have something going on. Need to have it checked out.
2006 Mini Cooper S
2009 E350 Sport AMG package