Toyota Sienna 2021, Manual, Page: 499 / 600

499
7-2. Steps to take in an emergency
7
Whe
n tr
ouble
a
rises
One of the following may be the
cause of the problem:
 The electronic key may not be
functioning properly.
(

P.502)
 There may not be sufficient
fuel in the vehicle’s tank.
Refuel the vehicle. (

P.261)
 There may be a malfunction
in the immobilizer system.
(

P.88)
 The hybrid system may be
malfunctioning due to an elec-
trical problem such as elec-
tronic key battery depletion or
a blown fuse. However,
depending on the type of mal-
function, an interim measure
is available to start the hybrid
system. (

P.499)
One of the following may be the
cause of the problem:
 The 12-volt battery may be
discharged. (

P.504)
 The 12-volt battery terminal
connections may be loose or
corroded. (

P.420)
One of the following may be the
cause of the problem:
 The 12-volt battery may be
discharged. (

P.504)
 One or both of the 12-volt bat-
tery terminals may be discon-
nected. (

P.420)
Contact your Toyota dealer if
the problem cannot be repaired,
or if repair procedures are
unknown.
When the hybrid system does
not start, the following steps can
be used as an interim measure
to start the hybrid system if the
power switch is functioning nor-
If the hybrid system
will not start
Reasons for the hybrid sys-
tem not starting vary
depending on the situation.
Check the following and
perform the appropriate
procedure:
The hybrid system will not
start even though the cor-
rect starting procedure is
being followed (

P.233)
The interior lights and
headlights are dim, or the
horn does not sound or
sounds at a low volume
The interior lights and
headlights do not turn on,
or the horn does not
sound
Starting the hybrid sys-
tem in an emergency