LATICS failed to make full use of Jesse Lingard’s second-half sending-off as Birmingham held on for a point.
The home side were below par pretty much across the board, and played second fiddle for much of the first half.
But they can still consider themselves unfortunate not to have given Uwe Rosler his third league win on the bounce.
Callum McManaman had the best chance for either side, only to see his left-foot drive from distance touched round the post by Darren Randolph just before the break.
And the home side were denied what they believed were three decent shouts for a penalty - the middle one involving Grant Holt looking a very good shout indeed.
They enjoyed a numerical advantage for the final half-hour, after Lingard had clattered Jordi Gomez on halfway which earned him a straight red from referee Stephen Martin.
But the visitors dug in for the remainder and extended their own unbeaten sequence to eight matches.
Wigan: Al Habi; Barnett, Rogne, Ramis; Perch, McArthur, McCann, Beausejour; McClean, McManaman, Holt,
Subs: Nicholls, Crainey, Shotton (for Rogne, 21), Gomez (for McClean, 46), Espinoza, Keane (for McCann, 71), Fortune.
Birmingham: Randolph; Caddis, Bartley, Durn, Robinson; Burke, Lee, Adeyemi, Novak; Lingard, Zigic.
Subs: Doyle, Mullins, Reilly (for Lee, 81), Shinnie (for Burke, 57), Ferguson, Brown, McLean (for Zigic, 69).
Referee: Stephen Martin.