Does xiangqi have anything resembling chess's idea of a weak colour complex, since the board uses intersections rather than coloured squares?
These answers restate the rules implemented by our open-source engine, which follows the WXF laws and is regression-tested against the official 110-diagram repetition casebook. Where an answer refers to a specific position, that position lives on the linked reference page, where the build verifies it against the engine before publishing.
Direct answer
No, and this is one of the cleaner structural differences between the two games. A chess colour complex weakness exists because bishops are permanently colour-bound, so losing the right bishop leaves every square of that colour permanently unguarded by a piece capable of reaching it. Xiangqi's board is a grid of uncoloured intersections, and no xiangqi piece is bound to a colour the way a bishop is, so there is no equivalent structural weakness tied to colour at all.
Why the underlying condition simply isn't there
A colour complex weakness is entirely a byproduct of the bishop's fixed colour binding; remove that binding and the concept has nothing left to attach to. Since no xiangqi piece is restricted to a subset of squares by colour, the entire category of weakness chess describes this way does not translate across.
What plays a loosely similar role instead
Xiangqi does have its own version of "permanently weak squares," most obviously the palace points a missing advisor or elephant leaves undefended for the rest of the game, but that weakness is tied to specific points from a specific missing piece, not to an entire diagonal colour the way a chess colour complex is.
Related questions
Is the elephant's confinement to its own side of the board a related idea?
Related in spirit, since it also creates fixed zones a piece can never influence, but it is about territory, not colour.
Do xiangqi players talk about weak squares in a similar way to chess players?
Yes, very much so, particularly around the palace, just without any reference to colour.
.