The primary cause of battery depletion is a software-related failure where vehicle control modules do not enter 'sleep mode' after the ignition is turned off. Confirm this by using a diagnostic scan tool to monitor the vehicle's bus communication; if specific modules remain active and continue to draw current after the vehicle has entered a locked/parked state, the system logic is failing to trigger a power-down. This is verified by identifying 'keep-alive' signals persisting in the CAN bus logs long after the vehicle should have gone dormant.
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