Clips previously released by ITV of Harry: The Interview, show him describing feelings of guilt and telling broadcaster Tom Bradby he had cried only once after the death of his mother Diana, Princess of Wales.
In a previously released trailer for the interview, Harry says he is publishing his memoirs because he does not know "how staying silent is ever going to make things better".
In another clip, he says he wants to reconcile with his family - but that it cannot happen without "some accountability".
The interview is the first of four broadcast appearances over the coming days, with the duke also speaking to Anderson Cooper for 60 Minutes on CBS News on Sunday night, Michael Strahan of Good Morning America on Monday and Stephen Colbert on the Late Show on CBS on Wednesday.
In the interview with Bradby, which aired on ITV at 9pm in the UK (0800 AEDT) on Sunday, Harry speaks about being unable to show any emotion when meeting mourners following the death of his mother in 1997.
He also admits to feeling "some guilt" when walking among the crowds gathered outside Kensington Palace, saying the only time he cried was at his mother's burial.
A string of revelations have already been leaked from the memoir, Spare, which is due to be published on Tuesday.
Harry has come under fire for some of the claims in the book, including that the Prince of Wales physically attacked him and called his wife, the Duchess of Sussex, "difficult" and "abrasive".
The Sun has reported that as well as the first alleged physical attack by his brother in 2019, Harry also claims that a "steaming" and "shouting" William grabbed his shirt as the pair held peace talks with their father in the gardens of Frogmore Cottage in 2021.
Other controversial claims include that William and Kate encouraged him to wear the Nazi uniform that sparked outrage in 2005, and that he killed 25 Taliban while serving in Afghanistan.
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