Lexus RX 450h Owner's Manual page 556

554 7-2. Steps to take in an emergency
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 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 your
Lexus dealer.
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 the 12-volt battery is removed or
■
discharged
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.
Vehicles with power back door: The
●
power back door must be initialized.
(P.179)
� � � � � � � � � � � � � � � � �
When exchanging the 12-volt battery
■
RX450h: Use a Central Degassing type
●
12-volt battery (European Regulations).
RX450hL: Use a 12-volt battery
designed for this vehicle.
RX450h: Use a 12-volt battery that the
●
case size is same as the previous one
(LN2), 20 hour rate capacity (20HR) is
equivalent (60Ah) or greater, and per-
formance rating (CCA) is equivalent
(460A) 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.)