Lexus GS 450h Manual page 2

Foreword
In April 2006, Lexus released the Lexus GS450h gasoline-electric
hybrid vehicle in North America. Except where noted in this guide,
basic vehicle systems and features for the GS450h are the same as
those on the conventional, non-hybrid, Lexus GS430/300. To educate
and assist emergency responders in the safe handling of the GS450h
hybrid technology, Lexus published this GS450h Emergency Response
Guide.
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 in the guide include:
• Lexus GS450h identification.
• Major Hybrid Synergy Drive component locations and descriptions.
• Extrication, fire, recovery, and additional emergency response
information.
• Roadside assistance information.
2007 Model Year GS450h
This guide is intended to assist emergency responders in the safe
handling of a Lexus GS450h hybrid vehicle during an incident.
NOTE:
Emergency Response Guides for Lexus alternative fuel vehicles may be
viewed at http://techinfo.lexus.com.
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