What's the Toyota error code e a5 1?

Code ea51 means the seat belt switch is or a loose connection in the connector in the seatbelt switch. If the Toyota seat switch stays closed for more than 15 minutes after the key is turned off, the ECM assumes the switch is bad which may produce code ea51. The seat belt switch helps prevent forget to buckle up. It is usually connected to an electronic control module that uses both Audio and visual warnings to alert when the seat belt is not latched.Vane sensors, which consist of a reed switch and magnet secured at a fixed distance to keep them actuated, are fitted inside the seatbelt holster. When the seat belt lock is inserted, and it comes between the reed switch and the magnet, the magnet's field is shunted away and the reed switch opens.