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Come back to it later. There is a character who will give you the answer. When you match the three symbols, it leads to the ice cream guy you need for the trophy. There's nothing else in there though, so it's not super important for game progression.
As was said, there is a way to find out which symbols to light up in another section of the game. It can be a bit cryptic but if I can figure it out, so can you.
theres actually 2 different functions with the lights. One is the combination that you find from another character elsewhere in the game, the other is if you light up the 3 symbols that look like symbols from Journey.