The radio detects HD FM stations but not HD AM. I'm sure there is at least one station in my area (WBZ Boston 1030) that broadcasts in HD. I checked the settings and the box to enable HD is checked for AM. With FM, the HD icon on the top left is shown all the time but only lit for HD stations. With AM the icon is not shown at all. I tried a rescan of local stations a couple of times with no change. I cannot determine if no AM station is broadcasting in HD, the HD AM signal is just not strong enough, or if there is a defect in the infotainment system. Anybody observed this or have a suggestion?