Subaru Ascent 2018-2026 Owner's Manual: Battery drainage reduction function

The Subaru Ascent is equipped with an intelligent battery drainage reduction system designed to automatically switch off interior lighting under certain conditions, helping to prevent unnecessary battery discharge and ensuring long-term reliability.

Battery drainage reduction function for various conditions

In the Subaru Ascent, this function enters a standby mode when the following conditions are met:

• The ignition switch is turned to the "OFF" position (for models with keyless access and push-button start system).
• The key is removed from the ignition cylinder (for models without keyless access system).

  If no further actions are performed within approximately 20 minutes while the Subaru Ascent is in standby mode, any active interior lighting will automatically turn off to conserve battery power.

  Turning off lights

• Map light
• Reading light
• Ignition switch illumination*2
• Cargo area light
• Ambient lighting
• Vanity mirror light
• Door courtesy lights

  Actions

• Turn the ignition switch to the "ACC" or "ON" position.
• Open or close any door, including the rear gate of the Subaru Ascent.
• Press the unlock button on the Subaru Ascent access key fob or remote transmitter.
• Grip the front door handle while carrying the Subaru Ascent access key fob to unlock the vehicle.*1
• Insert the key into the ignition switch.*2
• Approach the Subaru Ascent with the access key fob after locking the doors (if the OFF delay timer setting is active).*1
• Press the panic button on the Subaru Ascent key fob or transmitter.

*1: Models with "keyless access with pushbutton start system"
*2: Models without "keyless access with pushbutton start system"

Performing any of the actions listed above will reactivate the interior lighting system in the Subaru Ascent when the battery-saving function is active.

NOTE

• The Subaru Ascent battery drainage reduction function is always active and cannot be disabled.
• If this function is active while a door is open, the corresponding interior light may remain off to conserve battery power.
• To minimize battery drain in your Subaru Ascent, always ensure that all doors, including the rear gate, are fully closed when leaving the vehicle.