Before Recharging; After Recharging/Reconnecting The 12-Volt Battery - Lexus GS450h Owner's Manual

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6-3. Do-it-yourself maintenance

Before recharging

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When recharging, the 12-volt battery produces hydrogen gas which is flammable
and explosive. Therefore, observe the following precautions before recharging:
If recharging with the 12-volt battery installed on the vehicle, be sure to disconnect
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the ground cable.
Make sure the power switch on the charger is off when connecting and discon-
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necting the charger cables to the 12-volt battery.

After recharging/reconnecting the 12-volt battery

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The hybrid system may not start. Follow the procedure below to initialize the sys-
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tem.
Shift the shift lever to P.
1
Open and close any of the doors.
2
Restart the hybrid system.
3
Unlocking the doors using the smart access system with push-button start may not
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be possible immediately after reconnecting the 12-volt battery. If this happens, use
the wireless remote control or the mechanical key to lock/unlock the doors.
Start the hybrid system with the power switch in ACCESSORY mode. The hybrid
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system may not start with the power switch turned off. However, the hybrid system
will operate normally from the second attempt.
The power switch mode is recorded by the vehicle. If the 12-volt battery is recon-
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nected, the vehicle will return the power switch mode to the status it was in before
the 12-volt battery was disconnected. Make sure to turn off the power switch
before disconnect the 12-volt battery. Take extra care when connecting the 12-volt
battery if the power switch mode prior to discharge is unknown.
If the system will not start even after multiple attempts at all methods above, contact
your Lexus dealer.
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