Lexus IS250 U Owner's Manual page 425

How to initialize the tire pressure warning system
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Park the vehicle in a safe place and turn the engine switch off.
1
Initialization cannot be performed while the vehicle is moving.
Adjust the tire inflation pressure to the specified cold tire inflation pressure
2
level. (P. 519)
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 engine switch to IGNITION ON mode.
3
Press and hold the tire pressure
4
warning reset switch until the tire
pressure warning light blinks
slowly 3 times.
Wait for a few minutes with the engine switch in IGNITION ON mode and
5
then turn the engine switch off.
IS350/250_U (OM53C50U)
7-3. Do-it-yourself maintenance
425
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