Toyota Camry 2018 Owner's Manual page 533

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 battery of your vehicle.
Vehicles with a smart key system: Open and close any of the doors
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of your vehicle with the engine switch off.
Vehicles without a smart key system:
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Maintain the engine speed of the second vehicle and turn the
engine switch to the "ON" position, then start the vehicle's engine.
Vehicles with a smart key system:
Maintain the engine speed of the second vehicle and turn the
engine switch to IGNITION ON mode, then start the vehicle's
engine.
Once the vehicle's engine has started, remove the jumper cables in
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the exact reverse order from which they were connected.
Once the engine starts, have the vehicle inspected at your Toyota
dealer as soon as possible.
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Starting the engine when the battery is discharged
The engine cannot be started by push-starting.
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To prevent battery discharge
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Turn off the headlights and the audio system while the engine 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.
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When the battery is removed or discharged
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Information stored in the ECU is cleared. When the battery is depleted, have
the vehicle inspected at your Toyota dealer.
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Some systems may require initialization. (→P. 575)
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When removing the battery terminals
When the battery terminals are removed, the information stored in the ECU is
cleared. Before removing the battery terminals, contact your Toyota dealer.
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Charging the battery
The electricity stored in the battery will discharge gradually even when the
vehicle is not in use, due to natural discharge and the draining effects of cer-
tain electrical appliances. If the vehicle is left for a long time, the battery may
discharge, and the engine may be unable to start. (The battery recharges
automatically during driving.)
7-2. Steps to take in an emergency
531
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