TOYOTA 2011 Sienna - Manual (Page 409)

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3-1. When you think a malfunction has occurred
SIENNA AAS_U (OM45460U)
If the indicator light stops flashing even when the wireless
remote control switches are pressed
If the indicator light is illuminated or flashing even though the
wireless remote control switches are not being pressed
Reason Correction procedure
The battery of the wireless remote
control is discharged.
Replace the battery. (
→P. 40)
Reason Correction procedure
The wireless remote control may be
malfunctioning.
Contact your Toyota dealer.