Lexus RX 450h 2010 Owner's Manual page 499

4-3. Do-it-yourself maintenance
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How to initialize the tire pressure warning system
Park the vehicle in safe place and turn the "POWER" switch off.
STEP 1
Initialization cannot be performed while the vehicle is moving.
Adjust the tire inflation pressure to the specified cold tire inflation
STEP 2
pressure level. (→P. 637)
Make sure to adjust the tire pressure to the specified cold tire inflation
pressure level. The tire pressure warning system will operate based on
this pressure level.
Turn the "POWER" switch to ON mode.
STEP 3
STEP 4
Wait for a few minutes with the "POWER" switch on and then
STEP 5
turn the "POWER" switch off.
498
Press and hold the tire pressure
warning reset button until the tire
pressure warning light flashes
slowly 3 times.