Lexus LS460 - Rear Radar Sensor; System Operating Conditions; Whiplash Mitigation

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4-5. Using the driving support systems
LS460_EE (OM50D49E)
The rear radar sensor detects
objects approaching from behind
and determines whether a rear-
end collision is imminent based
on the position, speed and head-
ing of the object before it hap-
pens.
 System operating conditions
When the engine switch is in IGNITION ON mode and there is a possibility
of a rear-end collision due to a vehicle in the same lane approaching from the
rear, the system operates if all of the following conditions are met:
 Warning for the approaching vehicle (emergency flashers):
• The relative speed difference between your vehicle and the vehicle
approaching from behind is greater than about 15 km/h (9 mph).
• When the vehicle is stationary or moving forward while the brake pedal
is depressed.
• When the turn signal lights and emergency flashers are off.
 Whiplash mitigation (pre-crash intelligent head restraints):
• The relative speed difference between your vehicle and the vehicle
approaching from behind is greater than about 15 km/h (9 mph).
• Your vehicle is stopped or moving forward.
 Whiplash mitigation
The pre-crash intelligent head restraint may not stop in the proper position if
a hat is worn or the occupant's hair is bound at the back.
Rear radar sensor