Lexus IS F 2012 Owner's Manual page 503

Start the engine of the second vehicle. Increase the engine
STEP 2
speed slightly and maintain at that level for approximately 5
minutes to recharge the battery of your vehicle.
Open and close any of the doors with the "ENGINE START
STEP 3
STOP" switch OFF.
Maintain the engine speed of the second vehicle and turn the
STEP 4
"ENGINE START STOP" switch to IGNITION ON mode,
then start the vehicle' s engine.
Once the vehicle' s engine has started, remove the jumper
STEP 5
cables in the exact reverse order in which they were con-
nected.
Once the engine starts, have the vehicle checked at your Lexus dealer
as soon as possible.
Starting the engine when the battery is discharged
■
The engine cannot be started by push-starting.
To prevent battery discharge
■
Turn off the headlights and the audio system while the engine is off.
●
Turn off any unnecessary electrical components when the vehicle is running at a
●
low speed for an extended period, such as in heavy traffic, etc.
Charging the battery
■
The electricity stored in the battery will discharge gradually even when the vehi-
cle is not in use, due to natural discharge and the draining effects of certain
electrical appliances. If the vehicle is left for a long time, the battery may dis-
charge, and the engine may be unable to start. (The battery recharges automat-
ically during driving.)
5-2. Steps to take in an emergency
5
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