Once you tune into the HD channel then you use the right and left arrow (seek) buttons above the mode button...don't use the idrive or the steering wheel or it will just take you to the next frequency...you have to make sure it is locked on the first HD channel (ex. 92.1) before you can tune in 92.1-2....although I haven't found a way to store the alternate HD channel yet...anyone else??

hope this helps

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