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I have 38 presets and I am able to scroll through all of them by using the roller on my steering wheel and seeing it on my instrument cluster. You have to be sure that your iDrive has selected the right group of things to scroll through. For example, if you have your iDrive screen showing all your stations, then your steering wheel scroll will scroll through them all. If your iDrive is showing only your presets, then your steering wheel scroll will scroll through only your presets. If your iDrive is showing something else, like Nav, then your scroll wheel will scroll through whatever you had selected last in the Radio or CD settings.
I have the screen to be split and show the entertainment info on the right side so whatever station I tune to - it will show on the screen. Maybe that is why it never phased me that the selection on the iDrive screen didn't change with the steering wheel scroll button.
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