General Vehicle Information; Major Component Locations And General Information; Sounds And Vibrations Specific To The Hybrid - Lexus ES300h Towing And Road Service Manual

The hybrid system combines the use of a gasoline engine and an electric motor (traction motor) according to
driving conditions, improving fuel efficiency and reducing exhaust emissions.
Take care when handling the hybrid system, as it contains a high voltage system (about 650V at maximum) as
well as parts that become extremely hot when the hybrid system is operating. Obey the caution labels attached
to the vehicle.
Sounds and vibrations specific to a hybrid vehicle:
There may be no engine sounds or vibration even though the vehicle is able to move. Always change the shift
position to P when parked.
The following sounds or vibrations may occur when the hybrid system is operating and are not a malfunction:
Sounds may be heard from the hybrid battery (traction battery) behind the rear seats when the hybrid
system starts or stops.
Motor sounds may be heard from the engine compartment.
Sounds from the hybrid system may be heard when the cargo area lid is open.
Sounds may be heard from the transaxle when the hybrid system starts or stops, or while the vehicle is
idling.
Engine sounds may be heard when accelerating sharply.
Sounds may be heard due to regenerative braking when the brake pedal is depressed and accelerator
is loosened.
Other sounds, such as motors and mechanical noises, may be heard from the brake system when the
brake pedal is depressed.
Vibration may be felt when the gasoline engine starts or stops.
Cooling fan sounds may be heard from the air intake vent on the side of rear left seatback. When
driving in Eco mode, the fan noise may be louder than when driving normally.
General Information
3
1. Air Conditioning Compressor
2. Power Control Unit
3. High Voltage Cables (Orange)
4. Hybrid Battery
5. Service Plug
6. Electric Motor (Traction motor)
7. Caution Label