Starting The Hybrid System When The 12-Volt Battery Is Discharged; Charging The 12-Volt Battery - Lexus GS450h Owner's Manual

Start the engine of the second vehicle. Increase the engine speed
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slightly and maintain at that level for approximately 5 minutes to
recharge the 12-volt battery of your vehicle.
Open and close any of the doors of your vehicle with the power switch
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off.
Maintain the engine speed of the second vehicle and start the hybrid
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system of your vehicle by turning the power switch to ON mode.
Make sure the "READY" indicator comes on. If the indicator does not
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come on, contact your Lexus dealer.
Once the hybrid system has started, remove the jumper cables in the
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exact reverse order from which they were connected.
Once the hybrid system starts, have the vehicle inspected at your Lexus
dealer as soon as possible.

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
●
low speed for an extended period, such as in heavy traffic.

Charging the 12-volt battery

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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 elec-
trical appliances. If the vehicle is left for a long time, the 12-volt battery may dis-
charge, and the hybrid system may be unable to start. (The 12-volt battery recharges
automatically while the hybrid system is operating.)
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7-2. Steps to take in an emergency
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