Lexus 2013 IS250 Owner's Manual page 493

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8-2. Steps to take in an emergency
3
*
: Seat belt warning buzzer:
The seat belt warning buzzer sounds to alert the driver, front passenger and
rear passengers that his or her seat belt is not fastened. The buzzer sounds for
30 seconds after the vehicle reaches a speed of 20 km/h (12 mph). Then, if the
seat belt is still unfastened, the buzzer will sound in a different tone for 90
more seconds.

Passenger detection sensor, seat belt reminder and warning buzzer

If luggage is placed on a passenger seat, the passenger detection sensor may
cause the warning light to flash and the warning buzzer to sound even if a pas-
senger is not sitting in the seat.

If a cushion is placed on the seat, the sensor may not detect a passenger, and the
warning light may not operate properly.

If the malfunction indicator lamp comes on while driving
The malfunction indicator lamp will come on if the fuel tank becomes com-
pletely empty. If the fuel tank is empty, refuel the vehicle immediately. The mal-
function indicator lamp will go off after several trips.
If the malfunction indicator lamp does not go off, contact any authorized Lexus
dealer or repairer, or another duly qualified and equipped professional as soon as
possible.

Electric power steering system warning light (warning buzzer)
When the 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.

When the tire pressure warning light comes on (if equipped)
Carry out the following procedure after the tire temperature has lowered suffi-
ciently.

Check the tire inflation pressure and adjust to the appropriate level.

If the warning light does not go out even after several minutes, check that the
tire inflation pressure is at the specified level and carry out initialization.
The warning light may come on again if the above operations are conducted
without first allowing the tire temperature to lower sufficiently.

The tire pressure warning light may come on due to natural causes (if equipped)
The tire pressure warning light may come on due to natural causes such as natu-
ral air leaks and tire inflation pressure changes caused by temperature. In this
case, adjusting the tire inflation pressure will turn off the warning light (after a
few minutes).

When a tire is replaced with the spare tire (if equipped)
The compact spare tire is not equipped with a tire pressure warning valve and
transmitter. If a tire goes flat, the tire pressure warning light will not turn off even
though the flat tire has been replaced with the spare tire.

Conditions that the tire pressure warning system may not function properly (if
equipped)
P. 429
IS250_EE(OM53B11E)