Subaru Legacy BN/BS (2015-2019) Owners Manual: Power saving function

To protect the access key battery and the vehicle battery, the keyless access function will be disabled as follows.

•  When the keyless access function and the remote keyless entry system have not been used:

1.  5 days after the push-button ignition switch has been turned off, communication between the antennas and the access key will be stopped.
2.  9 days after step (1), the sensors (both lock sensor and unlock sensor) on the front passenger's door will be disabled.

•  When the access key has been left in the operating range for 10 minutes or longer while all doors are locked, the keyless access function will be disabled.

Recovery from power saving mode

When one of the following operations is performed, the keyless access function will be recovered.

•  Unlock by gripping the door handle (only when the sensors on the front passenger's door are not disabled) or pressing the rear gate opener button on the rear gate (Outback)/trunk opener button on the trunk lid (Legacy)
•  Lock or unlock by the remote keyless entry system
•  Open a door and then close it
•  Turn the push-button ignition switch to the "ON" position