Turns out that the answer to my issue is simply that when you engage the defroster setting (there are two defroster settings) on the main controller, the "passenger mode" is disabled so the light goes out. Evidently I had selected defrost and thought there was a problem with the "passenger" because the light wasn't on. Selecting any other position for air flow caused the light to come on for "passenger".
Just FYI,
Mike