Lexus 2016 GS350 Owner's Manual page 521

Starting the engine
Ensure that the shift lever is in P and depress the brake pedal.
1
Touch the Lexus emblem side of the electronic key to the engine switch.
2
When the electronic key is detected, a buzzer sounds and the engine switch will turn
to IGNITION ON mode.
When the smart access system with push-button start is deactivated in customization
setting, the engine switch will turn to ACCESSORY mode.
GS350/GS200t

Firmly depress the brake pedal and check that
3
only) are shown on the multi-information display.
Press the engine switch.
4
In the event that the engine still cannot be started, contact your Lexus dealer.
GS350_200t_GS F_OM_OM30E86U_(U)
7-2. Steps to take in an emergency
GS F

and a message (GS F
521
7