Lexus RX450H Manual page 535

4-3. Do-it-yourself maintenance

The initialization operation

Make sure to carry out initialization after adjusting the tire inflation pres-
sure.
Also, make sure the tires are cold before carrying out initialization or tire
inflation pressure adjustment.

If you have accidentally turned the "POWER" switch off during initial-
ization, it is not necessary to press the reset switch again as initialization
will restart automatically when the "POWER" switch has been turned to
ON mode for the next time.

If you accidentally press the reset switch when initialization is not neces-
sary, adjust the tire inflation pressure to the specified level when the tires
are cold, and conduct initialization again.

Warning performance of the tire pressure warning system
The warning of the tire pressure warning system will change in accordance
with driving conditions. For this reason, the system may give a warning
even if the tire pressure does not reach a low enough level, or if the pressure
is higher than the pressure that was adjusted to when the system was initial-
ized.

When initialization of the tire pressure warning system has failed
Initialization can be completed in a few minutes. However, in the following
cases, the settings have not been recorded and the system will not operate
properly. If repeated attempts to record tire inflation pressure settings are
unsuccessful, have the vehicle inspected by any authorized Lexus dealer or
repairer, or another duly qualified and equipped professional.

When operating the tire pressure warning reset switch, the tire pressure
warning light does not blink 3 times.

After carrying out the initialization procedure, the tire pressure warning
light blinks for 1 minute then stays on after driving for 10 minutes.
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