Lexus IS300H 2017 Manual page 633

Maintain the engine speed of the second vehicle and start the hybrid system
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of your vehicle by turning the power switch to ON mode.
Make sure the "READY" indicator comes on. If the indicator does not come
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on, contact any authorized Lexus retailer or Lexus authorized repairer, or any
reliable repairer.
Once the hybrid system has started, remove the jumper cables in the exact
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reverse order from which they were connected.
Once the hybrid system starts, have the vehicle inspected at any authorized
Lexus retailer or Lexus authorized repairer, or any reliable repairer 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
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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 electrical appli-
ances. 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.)
When recharging or replacing the 12-volt battery
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In some cases, it may not be possible to unlock the doors using the smart entry & start
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system when the 12-volt battery is discharged. Use the wireless remote control or the
mechanical key to lock or unlock the doors.
The hybrid system may not start on the first attempt after the 12-volt battery has
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recharged but will start normally after the second attempt. This is not a malfunction.
The power switch mode is memorized by the vehicle. When the 12-volt battery is
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reconnected, the system will return to the mode it was in before the 12-volt battery was
discharged. 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 dis-
charged, be especially careful when reconnecting the 12-volt battery.
8-2. Steps to take in an emergency
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