Toyota 2014 Sienna Manual page 512

3-4. Using the rear audio system
■
Before using the remote controller (for new vehicle owners)
STEP 1
STEP 2
■
When the remote controller batteries are fully depleted
■
If the remote controller batteries are discharged
The following symptoms may occur.
●
The rear seat entertainment system control will not function properly.
●
The operational range is reduced.
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Remove the cover.
Remove the insulating sheet.
Remove the depleted batteries and install
new 2 AA batteries.