Srs Warning Light; Front Passenger Detection Sensor, Seat Belt Reminder And Warning Buzzer; Electric Power Steering System Warning Light (Warning Buzzer); If The Malfunction Indicator Lamp Comes On While Driving - Lexus rx450h Service Manual

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: Driver' s and front passenger' s seat belt warning buzzer:
The driver' s seat belt warning buzzer sounds to alert the driver that his or her seat belt
is not fastened. Once the power switch is turned to ON mode, the buzzer sounds for
6 seconds. If the vehicle reaches a speed of 12 mph (20 km/h), the buzzer sounds
once. If the seat belt is still unfastened after 24 seconds, the buzzer will sound inter-
mittently for 10 seconds. Then, if the seat belt is still unfastened, the buzzer will sound
in a different tone for 20 more seconds.
The front passenger' s seat belt warning buzzer sounds to alert the front passenger
that his or her seat belt is not fastened. The buzzer sounds once if the vehicle reaches
a speed of 12 mph (20 km/h). If the seat belt is still unfastened after 24 seconds, the
buzzer will sound intermittently for 10 seconds. Then, if the seat belt is still unfastened,
the buzzer will sound in a different tone for 20 more seconds.

SRS warning light

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This warning light system monitors the airbag sensor assembly, front impact sensors, side
impact sensors (front door), side impact sensors (rear), driver' s seat position sensor,
driver' s seat belt buckle switch, front passenger occupant classification system (ECU and
sensors), "AIR BAG ON" indicator light, "AIR BAG OFF" indicator light, front passen-
ger' s seat belt buckle switch, driver' s seat belt pretensioner, front passenger' s seat belt
pretensioner and force limiter, airbags, interconnecting wiring and power sources.
(P. 38)

Front passenger detection sensor, seat belt reminder and warning buzzer

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If luggage is placed on the front passenger seat, the front passenger detection sensor
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may cause the warning light to flash and the warning buzzer to sound even if a passen-
ger is not sitting in the seat.
If a cushion is placed on the seat, the sensor may not detect a passenger, and the warn-
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ing light may not operate properly.

Electric power steering system warning light (warning buzzer)

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When the 12-volt battery charge becomes insufficient of the voltage temporarily drops,
the electric power steering system warning light may come on and the warning buzzer
may sound.

If the malfunction indicator lamp comes on while driving

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First check the following:
Is the fuel tank empty?
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If it is, fill the fuel tank immediately.
Is the fuel tank cap loose?
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If it is, tighten it securely.
The light will go off after several driving trips.
If the light does not go off even after several trips, contact your Lexus dealer as soon as
possible.
RX450h_U_OM0E013U
7-2. Steps to take in an emergency
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