Lexus 2007 GS430 Quick Manual page 461

Before recharging
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When recharging, the battery produces hydrogen gas which is flammable and
explosive. Therefore, before recharging:
If recharging with the battery installed on the vehicle, be sure to disconnect the
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ground cable.
Make sure the engine switch on the charger is off when connecting and discon-
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necting the charger cables to the battery.
After recharging/reconnecting the battery
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In some cases, the engine may not start. Follow one or both of the following proce-
dures:
After opening and closing the driver's door, wait 10 seconds then attempt to
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start the engine. (If the system does not start first time, repeat the procedure.)
With the shift lever in "P" and the engine switch in the "OFF" mode, open and
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close any door, then attempt to start the engine.
If the system will not start even after multiple attempts at both methods, contact
your Lexus dealer.
4-3. Do-it-yourself maintenance
I n f o r ma t i o n P r o v i d e d b y :
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387