Toyota 86777-76040 Mayday Battery Control Module

When disconnecting the Car Batteries, it is important to always disconnect the cable from the negative battery terminal first and hook it up last to avoid shorting the battery. Additionally, it is recommended to wait at least 90 seconds after turning off the ignition switch before disconnecting the negative battery cable to allow various systems to record memory and settings. Some systems on the vehicle require continuous battery power, so it is wise to remove the key from the ignition and keep it with you to prevent accidental locking of the power door locks when reconnecting the battery. Memory-savers can be used to maintain power to certain circuits while disconnecting the battery. To disconnect the battery, loosen the cable end bolt and isolate the cable end to prevent accidental contact with the battery terminal. After reconnecting the battery, several relearning procedures may need to be performed, such as correcting the steering angle neutral point, power window initialization, sunroof initialization, smart access learning, and power trunk lid operation. These procedures vary depending on the model and year of the vehicle.