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Anyway, here's the reset procedure, directly from a BMW shop manual (see attachment). It states you can only reset if the brake pad sensor has been tripped.
In my experiences with this car, there is an initial "warning", stating you have X miles to replace the pads. This will count down to zero. Eventually the pad sensor will be tripped, and it will tell you to go to a service center now and replace them. When I have got to this point, I have always been able to reset using diagnostic mode after replacing the pads and sensor (no scan tool needed). I have never replaced the pads and attempted to reset before tripping the sensor, but I am guessing it's not possible to do so, given BMW's statement. If the pad sensor has been tripped, and reset isn't possible, then I guess you need a scan tool; there isn't some other hidden way.
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