Toyota 2014 Sienna Manual page 234

2-1. Driving procedures
When stopping the engine with the shift lever in a position other
than P
If the engine is stopped with the shift lever in a position other than P,
the "ENGINE START STOP" switch will not be turned off but instead
be turned to ACCESSORY mode. Perform the following procedure to
turn the switch off:
STEP 1
Check that the parking brake is set.
STEP 2
Shift the shift lever to P.
STEP 3
Check that the indicator on the "ENGINE START STOP"
switch is illuminated in amber and then press the "ENGINE
START STOP" switch once.
STEP 4
Check that the indicator on the "ENGINE START STOP"
switch is off.
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Auto power off function
If the vehicle is left in ACCESSORY mode for more than 20 minutes or
IGNITION ON mode (the engine is not running) for more than an hour with
the shift lever in P, the "ENGINE START STOP" switch will automatically turn
off. However, this function cannot entirely prevent battery discharge. Do not
leave the vehicle with the "ENGINE START STOP" switch in ACCESSORY
or IGNITION ON mode for long periods of time when the engine is not
running.
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Operation of the "ENGINE START STOP" switch
When operating the "ENGINE START STOP" switch, one short, firm press is
enough. If the switch is pressed improperly, the engine may not start or the
"ENGINE START STOP" switch mode may not change. It is not necessary to
press and hold the switch.
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