Introduction

Foreword



High voltage electricity powers the electric motor, generator, A/C compressor, and inverter/converter. All other automotive electrical devices such as the horn, radio, and gauges are powered from a separate 12-Volt battery. Numerous safeguards have been designed into the GS450h to help ensure the high voltage, approximately 288-Volts, Nickel Metal Hydride (NiMH) Hybrid Vehicle (HV) battery pack is kept safe and secure in an accident.

The GS450h utilizes the following electrical systems:
- Maximum 650-Volts AC
- Nominal 288-Volts DC
- Maximum 37-Volts AC / DC
- Nominal 12-Volts DC

GS450h Features:
- First Hybrid Synergy Drive to utilize rear wheel drive exclusively.
- A boost converter in the inverter assembly that boosts to 650-Volts the available voltage to the electric motor.
- The high voltage hybrid vehicle battery pack is rated at 288-Volts.
- A high voltage motor driven air conditioning compressor rated at 288-Volts.
- High voltage High Intensity Discharge (HID) headlights.
- A high voltage electric Power Steering (EPS) assist motor rated at 37-Volts.
- The body electrical system rated at 12-Volts negative chassis ground.
- An optional active stabilizer suspension system with a separate 12-Volt battery.
- Supplemental Restraint System (SRS) - dual stage frontal airbags, front knee airbags, front seat and optional rear seat side airbags, side curtain airbags, and front seat belt pretensioners.

High voltage electrical safety is an important factor in the emergency handling of the GS450h Hybrid Synergy Drive system. It is important to recognize and understand the disabling procedures and warnings throughout the guide.

Additional topics include:
- Lexus GS450h identification.
- Major Hybrid Synergy Drive Component locations and descriptions.
- Extrication, fire, recovery, and additional emergency response information.
- Roadside assistance information.

This information is intended to assist emergency responders in the safe handling of a Lexus CGS450h hybrid vehicle during an incident.

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