Tire Monitoring System: Service and Repair

Initializing The Tire Pressure Warning System
The tire pressure warning system must be initialized in the following circumstances:
- When rotating the tires.
- When the tire inflation pressure is changed such as when changing traveling speed.
When the tire pressure warning system is initialized, the current tire inflation pressure is set as the benchmark pressure.

How To Initialize The Tire Pressure Warning System
1. Park the vehicle in a safe place and turn the engine switch off.
Initialization cannot be performed while the vehicle is moving.
2. Adjust the tire inflation pressure to the specified cold tire inflation pressure level.
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.
3. Turn the engine switch to IGNITION ON mode.
4. Press and hold the tire pressure warning reset switch until the tire pressure warning light blinks slowly 3 times.
5. Wait for a few minutes with the engine switch in IGNITION ON mode and then turn the engine switch off.

- Make sure to carry out initialization after adjusting the tire inflation pressure.
Also, make sure the tires are cold before carrying out initialization or tire inflation pressure adjustment.
- If you have accidentally turned the engine switch off during initialization, it is not necessary to press the reset switch again as initialization will restart automatically when the engine switch has been turned to IGNITION ON mode for the next time.
- If you accidentally press the reset switch when initialization is not necessary, adjust the tire inflation pressure to the specified level when the tires are cold, and conduct initialization again.

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 a Lexus dealer.

- 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 20 minutes.