Lexus GS450h Owner's Manual page 421

The initialization operation (vehicles with the tire pressure warning system)
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Make sure to carry out initialization after adjusting the tire inflation pressure.
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Also, make sure the tires are cold before carrying out initialization or tire inflation pres-
sure adjustment.
If you have accidentally turned the power switch off during initialization, it is not neces-
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sary to manually restart the initialization again, as initialization will restart automatically
the next time the power switch is turned to ON mode.
If you accidentally perform initialization when initialization is not necessary, adjust the
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tire inflation pressure to the specified level when the tires are cold, and conduct initial-
ization again.
Warning performance of the tire pressure warning system (if equipped)
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The warning of the tire pressure warning system will change in accordance with the con-
ditions under which it was initialized. 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 initialized.
When initialization of the tire pressure warning system has failed (vehicles with the tire
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pressure warning system)
Initialization can be completed in a few minutes. However, in the following cases, the set-
tings 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 retailer or Lexus authorized repairer, or any reliable
repairer.
The initialization message is not displayed on the multi-information display when per-
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forming initialization.
After carrying out the initialization procedure, the tire pressure warning light blinks for 1
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minute then stays on after driving for 20 minutes.
Registering ID codes (vehicles with the tire pressure warning system)
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The ID codes of the tire pressure warning valve and transmitters for two sets of wheels
can be registered.
It is not necessary to register the ID codes when replacing normal tires with snow tires, if
the ID codes for the wheels of both normal tires and snow tires are registered before-
hand.
For information about changing ID codes, ask any authorized Lexus retailer or Lexus
authorized repairer, or any reliable repairer.
Certification for tire pressure warning system (vehicles with the tire pressure warning
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system)
GS450h_300h_OM_OM30F92E_(EE)
6-3. Do-it-yourself maintenance
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