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7-2. Steps to take in an emergency
soon as possible.
Starting the hybrid system when the
12-volt battery is discharged
The hybrid system cannot be started by
push-starting.
To prevent 12-volt battery discharge
Turn off the headlights and the audio sys-
tem while the hybrid system is off.
Turn off any unnecessary electrical com-
ponents when the vehicle is running at a
low speed for an extended period, such
as in heavy traffic.
When the 12-volt battery is removed or
discharged
Information stored in the ECU is cleared.
When the 12-volt battery is depleted,
have the vehicle inspected at any author-
ized Lexus retailer or Lexus authorized
repairer, or any reliable repairer.
Some systems may require initialization.
(P.589)
When removing the 12-volt battery ter-
minals
When the 12-volt battery terminals are
removed, the information stored in the
ECU is cleared. Before removing the
12-volt battery terminals, contact any
authorized Lexus retailer or Lexus author-
ized repairer, or any reliable repairer as
soon as possible.
Charging the 12-volt battery
The electricity stored in the 12-volt battery
will discharge gradually even when the
vehicle is not in use, due to natural dis-
charge and the draining effects of certain
electrical appliances. If the vehicle is left for
a long time, the 12-volt battery may dis-
charge, and the hybrid system may be una-
ble to start. (The 12-volt battery recharges
automatically while the hybrid system is
operating.)
When recharging or replacing the
12-volt battery
In some cases, it may not be possible to
unlock the doors using the smart entry &
start system when the 12-volt battery is
discharged. Use the wireless remote
control or the mechanical key to lock or
unlock the doors.
The hybrid system may not start on the
first attempt after the 12-volt battery has
recharged but will start normally after the
second attempt. This is not a malfunction.
The power switch mode is memorized by
the vehicle. When the 12-volt battery is
reconnected, the system will return to the
mode it was in before the 12-volt battery
was discharged. Before disconnecting
the 12-volt battery, turn the power switch
off.
If you are unsure what mode the power
switch was in before the 12-volt battery
discharged, be especially careful when
reconnecting the 12-volt battery.
When replacing the 12-volt battery
Use a Central Degassing type 12-volt
battery (European Regulations).
Use a 12-volt battery with the same case
size as the previous 12-volt battery and an
equivalent 20 hour rate capacity (20HR)
or greater.
If the sizes differ, the 12-volt battery can-
not be properly secured.
If the 20 hour rate capacity is low, even if
the time period where the vehicle is not
used is a short time, the 12-volt battery
may discharge and the hybrid system
may not be able to start.
Use a 12-volt battery with a handle. If a
12-volt battery without a handle is used,
removal is more difficult.
After replacing, firmly attach the follow-
ing items to the exhaust hole of the
12-volt battery.
Use the exhaust hose that was attached
to the 12-volt battery before replacing
and confirm that it is firmly connected to
the hole section of the vehicle.
Use the exhaust hole plug included with
the 12-volt battery replaced or the one
installed on the 12-volt battery prior to
the replacement. (Depending on the
12-volt battery to be replaced, the
exhaust hole may be plugged.)
554


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