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The code ea51 indicates a problem with the seat belt switch, either due to a loose connection in the switch's connector or the switch itself. In a Toyota, if the seat switch remains closed for over 15 minutes after the key is turned off, the ECM will detect this as a faulty switch, potentially triggering code ea51. This switch is important for reminding drivers to fasten their seat belt, typically linked to an electronic control module that provides audio and visual alerts if the seat belt is not secured. Vane sensors, including a reed switch and magnet set at a fixed distance to activate them, are located within the seatbelt buckle. When the seat belt is inserted and disrupts the alignment between the reed switch and magnet, the switch opens due to the magnet's field being redirected.
If the Toyota seat switch remains in the closed position for over 15 minutes after the ignition is turned off, the ecm will detect it as faulty and trigger code EA51.
Apologies, I'm not familiar with that information!