Introduction

High voltage electricity powers the electric motors, generator, inverter/ converter, and power steering. All other automotive electrical devices such as the headlights, radio, and gauges are powered from a separate 12-Volt battery. Numerous safeguards have been designed into the RX 400h to help ensure the high voltage, approximately 288-Volt, Nickel Metal Hydride (NiMH) Hybrid Vehicle (HV) battery pack is kept safe and secure in an accident.

The RX 400h utilizes the following electrical systems:
- Maximum 650-Volts AC
- Nominal 288-Volts DC
- Nominal 42-Volts DC
- Nominal 12-Volts DC

RX 400h Features:
- Adoption of Hybrid Synergy Drive as the name for the Lexus Gasoline - Electric Hybrid System.
- Hybrid Synergy Drive includes a boost converter in the inverter assembly that boosts to 650-Volts the available voltage to the electric motors.
- The high voltage hybrid vehicle battery pack rated at 288-Volts.
- A high voltage motor driven air conditioning compressor rated at 288- Volts.
- A high voltage Electric Power Steering (EPS) assist motor rated at 42- Volts.
- Body electrical system rated at 12-Volts negative chassis ground.
- Both two-wheel-drive (2WD) and four-wheel-drive (4WD) configurations are available.
- 4WD models include an additional 650-Volt electric motor to drive the rear wheels.
- Supplemental Restraint System (SRS)-dual stage frontal airbags, driver knee airbag, front seat mounted side airbags, side curtain airbags, and front seat belt pretensioners.

High voltage electrical safety is an important factor in the emergency handling of the RX 400h Hybrid Synergy Drive system. It is important to recognize and understand the disabling procedures and warnings throughout the guide.




Additional topics include:
- Lexus RX 400h identification.
- Major Hybrid Synergy Drive component locations and descriptions.
- Extrication, fire, recovery, and additional emergency response information.
- Roadside assistance information. 2006 Model Year RX 400h By following the information in this guide, emergency responders should be able to safely perform a rescue involving the Lexus RX 400h hybrid vehicle.

NOTE: Emergency Response Guides for select Lexus alternative fuel vehicles may be viewed at http:// techinfo. lexus. com.