Auxiliary Battery is Discharged [11/2023 - ]: Description

General causes of auxiliary battery depletion include the switches of electrical devices mistakenly left on, service life of the auxiliary battery, charging device malfunction, or application of excessive electrical load by the customer, etc.

Therefore, it is important to properly grasp the usage conditions of the customer's vehicle and carry out appropriate troubleshooting (systematized failure diagnosis).

HINT: 

If the power is mistakenly left on, the History of Reason for Operation may remain in the certification ECU (smart key ECU assembly).