Lexus LS 600hL 2007, Emergency Response Manual

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The HV battery pack powers the high voltage
electrical system with DC electricity. Positive and
negative orange coloured high voltage power
cables are routed from the battery pack, under the
vehicle floor pan, along the propeller shaft and
transmission tunnel to the inverter assembly.
The inverter assembly contains a circuit that boosts
the HV battery voltage from 288 to 650 Volts DC.
The inverter assembly creates 3-phase AC to power
the motor and generator located in the
transmission. Power cables are routed from the
power control unit to each high voltage motor
(electrical motor, electric generator, and A/C
compressor). The following systems are intended to
help keep occupants in the vehicle and emergency
responders safe from high voltage electricity:
High Voltage Safety System
• A high voltage fuse provides short circuit
protection in the HV battery pack.
• Positive and negative high voltage power
cables connected to the HV battery pack are
controlled by 12-Volt normally open relays .
When the vehicle is shut off, the relays
stop electrical flow from leaving the HV
battery pack.
• Both positive and negative power cables
are insulated from the metal chassis, so there
is no possibility of electric shock when
touching the metal chassis.
• A ground-fault monitor continuously
monitors for high voltage leakage to the metal
chassis while the vehicle is running. If a
malfunction is detected, the hybrid vehicle
computer
will illuminate the master
warning light in the instrument cluster and
indicate "CHECK HYBRID SYSTEM" on the
multi-information display.
HIGH VOLTAGE SAFETY
WARNING:
The high voltage system may remain powered for
up to 10 minutes after the vehicle is shut off or
disabled. To prevent serious injury or death from
severe burns or electric shock, avoid touching,
cutting, or opening any orange high voltage power
cable or high voltage component.
High Voltage Safety System –
Vehicle Shut Off ( READY -OFF)
High Voltage Safety System –
Vehicle On and Operational ( READY -ON)