Lexus NX450h+ 2021 Owner's Manual page 699

INFORMATION
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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
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system after the 12-volt battery has been replaced.
Use the wireless remote control or the mechanical key to lock or unlock the doors.
If the hybrid system cannot be started the first time the power switch is pressed
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after removing and installing the 12-volt battery, touch the Lexus emblem side of the
electronic key to the power switch to start the hybrid system.
● The power switch mode is memorized by the vehicle.
After the 12-volt battery has been recharged or replaced, the power switch will return
to the mode it was in before it was discharged or removed.
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 was
discharged, be especially careful when reconnecting the 12-volt battery.
● Some systems may require initialization.
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To prevent 12-volt battery discharge
● Turn off the headlights and the audio system while the hybrid system is off.
Turn off any unnecessary electrical components when the vehicle is running at a low
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speed for an extended period, such as in heavy traffic.
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If the vehicle 12-volt battery is discharged
● The doors cannot be locked or unlocked using the smart entry & start system or
wireless remote control, and the door opener switches will not operate. Use the me-
chanical key to enable/disable manual release handle operation. By enabling manual
release handle operation, the door can be opened.
Information recorded by various computers will be cleared.
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When the 12-volt battery is depleted, have the vehicle inspected at any authorized
Lexus retailer or Lexus authorized repairer, or any reliable repairer.
● Some systems may require initialization.
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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 discharge and the draining effects of certain electrical
appliances.
If the vehicle is left for a long time, the 12-volt battery may discharge, and the hybrid
system may be unable to start.
(The 12-volt battery recharges automatically while the hybrid system is operating.)
9-3. If the hybrid system will not start
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