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The 2010 Toyota Yaris does not feature a separate fuel pump relay; instead, the function is integrated directly into the ECU using a system called "Circuit Opening Relay" (C/OPN). If you encounter a relay problem, chances are it's not the issue, as it's more likely related to the fuel pump or the fuel pressure sensor. Unfortunately, fixing this generally requires replacing the entire ECU, although addressing the fuel pressure sensor issue might be a more manageable solution compared to swapping the relay, which isn't possible for the Yaris model.
The fuel pump relay for the 2010 Toyota Yaris is located in the fuse box under the hood, specifically on the panel designated for relays.