Lexus ES300h Owner's Manual page 519

Emergency start function
When the hybrid system does not start, the following steps can be used as an
interim measure to start the hybrid system if the power switch is functioning nor-
mally:
Do not use this starting procedure except in cases of emergency.
Set the parking brake.
1
Shift the shift lever to P.
2
Turn the power switch to ACCESSORY mode.
3
Press and hold the power switch for about 15 seconds while depressing the
4
brake pedal firmly.
Even if the hybrid system can be started using the above steps, the system may
be malfunctioning. Have the vehicle inspected by your Lexus dealer.
ES300h_OM_OM33B71U_(U)
8-2. Steps to take in an emergency
519
8