Reasons for the hybrid system not starting vary depending on the situation.
Check the following and perform the appropriate procedure:
The hybrid system will not start even though the correct starting procedure is being followed.
One of the following may be the cause of the problem:
Refuel the vehicle.
The interior lights and headlights are dim, or the horn does not sound or sounds at a low volume.
One of the following may be the cause of the problem:
The interior lights and headlights do not turn on, or the horn does not sound.
One of the following may be the cause of the problem:
Contact your Lexus dealer if the problem cannot be repaired, or if repair procedures are unknown.
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.
Do not use this starting procedure except in cases of emergency.
1. Turn the power switch to ON mode and check that the parking brake is set.
2. Shift the shift lever to P.
3. Turn the power switch to ACCESSORY mode.
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 your Lexus dealer.
Lexus RX (RX 350L, RX450h) 2016-2024 Repair Manual > Sfi System: Engine Coolant Temperature Sensor 1 Circuit Short to Ground (P011511)
DESCRIPTION A thermistor, whose resistance value varies according to the engine coolant temperature, is built into the engine coolant temperature sensor. The structure of the sensor and its connection to the ECM are the same as those of the intake air temperature sensor. HINT: When DTC P011511 is st ...
Lexus RX (RX 350L, RX450h) 2016-2024 Repair Manual > Sfi System: Starter Relay Circuit Short to Battery (P061512)
MONITOR DESCRIPTION While the engine is being cranked, positive battery voltage is applied to terminal STA of the ECM. If the ECM detects the starter control (STA) signal while the vehicle is being driven, it determines that there is a malfunction in the STA circuit. The ECM then illuminates the MIL ...