Lexus 2013 IS250C Owner's Manual page 530

5-2. Steps to take in an emergency
Starting the engine
Shift the shift lever to P and apply the brakes.
STEP 1
STEP 2
Press the "ENGINE START STOP" switch within 10 seconds
STEP 3
after the buzzer sounds, keeping the brake pedal depressed.
In the event that the engine still cannot be started, contact your Lexus
dealer.
530
Touch the Lexus emblem side of
the electronic
"ENGINE START STOP" switch.
An alarm will sound to indicate that
the start function cannot detect the
electronic key that is touched to
the "ENGINE START STOP"
switch if any of the doors is opened
and closed while the key is touched
to the switch.
key to the