Toyota Sienna Owner's Manual page 60

60
3. When you think a malfunction has occurred
If the indicator light stops flashing even when the wireless
remote control switches are pressed
The battery of the wireless remote
control is discharged.
If the indicator light is illuminated or flashing even though the
wireless remote control switches are not being pressed
The wireless remote control may be
malfunctioning.
SIENNA_AAS_OM08011U_(U)
Reason
Reason
Correction procedure
Replace the battery. (P. 40)
Correction procedure
Contact your Toyota dealer.