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To locate the headlamp relay for your Toyota Yaris, check for code H-LP/AMT Relay on a diagram. You can find it in the small relay box under the hood on the passenger's side of the vehicle. This relay often causes issues for drivers, as a malfunctioning one can lead to sporadic failures or inadequate lighting from the Yaris headlights. If you're unsure if the relay is faulty, try switching it with the HTR relay located in the center of the bottom row of the fuse panel under the dashboard. If switching the relays solves the issue, it's worth investing in a replacement relay, which is far more affordable than buying new headlights.
Look around the primary electrical panel to locate the headlight relay on a Toyota Yaris.