Lexus GS 450h 2008 Owner's Manual page 538

5-2. Steps to take in an emergency
Starting the hybrid system when the 12 volt battery is discharged
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The hybrid system cannot be started by push-starting.
To prevent 12 volt battery discharge
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Turn off the headlights and the audio system while the hybrid system is off.
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Turn off any unnecessary electrical components when the vehicle is running at a
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low speed for an extended period, such as in heavy traffic, etc.
When the 12 volt battery is removed or discharged
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The hybrid system may not start. (→P. 431)
Also, the following systems must be initialized.
Tire pressure warning system ( → P. 436)
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Intuitive parking assist ( → P. 512)
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CAUTION
Avoiding battery fires or explosions
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Observe the following precautions to prevent accidentally igniting the flammable
gas that may be emitted from the battery.
Make sure the jumper cable is connected to the correct terminal and that it is not
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unintentionally in contact with any part other than the intended terminal.
Do not allow the jumper cables to come into contact with the "+" and "-" termi-
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nals.
Do not allow open flame or use matches, cigarette lighters or smoke near the
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battery.
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