Pearson had to watch the game from the stands because of a one-match touchline ban but saw 20-year-old defender Liam Moore score his first goal for the club with a powerful header in the 15th minute.
The Foxes controlled most of the match, although Wigan had penalty appeals turned down in the first half when Marc-Antoine Fortune went tumbling after a challenge from Moore.
Leicester then clinched victory in the 81st minute when David Nugent hammered home a penalty after Jamie Vardy had been tripped by Jean Beausejour.
Foxes boss Pearson said: "It was a good match and a good performance by us.
"Liam played his part in a very good team performance. It's the first time he has scored and a reward for the way he has worked at his game in the last 12 to 15 months.
"We've controlled the majority of the game and, even when Wigan had a little more possession just before we went 2-0 up, we've been fairly comfortable.
"We've beaten a side who will do well and have some very good players.
"We used Jamie Vardy to stretch them with his pace and he caused them problems.
"I'm pretty pleased with how the season has started. We've shown we can win games when we're not playing well but today we did.
"You could argue it was our best all-round team performance of the season."
Latics boss Owen Coyle said: "We got the rough end of two decisions. It was a stonewall penalty when Fortune was fouled, then Vardy has got on the wrong side of Beausejour and it's not a penalty.
"We came into the game on the back of a terrific performance against Forest looking for three points but we did not play as well as we can.
"It was very disappointing to concede such a soft goal. It was a good header but he (Liam Moore) hasn't been marked.
"There were only three or four players with plus marks when you need seven or eight. If I could have used all seven substitutes, I would have done.
"Yet we had the momentum and looked like equalising until they got the penalty.
"This league is about 46 games not six, and we will get better. There's still a lot for us to look forward to."