Lexus RX450H Manual page 645

5-2. Steps to take in an emergency
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 normally:
STEP 1
Set the parking brake.
STEP 2
Shift the shift lever to P.
STEP 3
Turn the "POWER" switch to ACCESSORY mode.
STEP 4
Press and hold the "POWER" switch for about 15 seconds
while depressing the 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 any
authorized Lexus dealer or repairer, or another duly qualified and
equipped professional.
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