Tire Pressure Warning System: Precaution

WARNING: This page is about a different car, the 2008 Toyota RAV4. However, it is still accessible from the selected car via links, so may be relevant.

TIRE PRESSURE WARNING SYSTEM PRECAUTION
1. When the tire pressure warning light comes on, immediately check the tire pressure of the tire and adjust it to the specified value. (The tire pressure warning light will come on after blinking for 1 minute if there is an open in the tire pressure warning light circuit.)
  
  Fig 1: Identifying Tire Pressure Warning Light
  Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
  
  NOTE: When adjusting the tire inflation pressure, adjust the inflation of all the tires (including the spare tire) because this system monitors the pressure of all tires.
  
  Standard pressure: 220 kPa (2.2 kgf/cm ² , 32 psi)
2. When the tire pressure warning light comes on after blinking for 1 minute, there is a malfunction in the system. Check for DTCs.
3. It is necessary to register the transmitter ID in the tire pressure warning ECU after replacing a tire pressure warning valve and transmitter and/or tire pressure warning ECU (See REGISTRATION ).
4. When replacing the tire pressure warning ECU:
  1. Using the Data List, read the transmitter IDs registered in the ECU and make a note of them before removing the tire pressure warning ECU.
  2. Register the transmitter IDs after installing a new tire pressure warning ECU.
5. When replacing a tire pressure warning valve and transmitter:
  1. Take a note of the 7-digit number (transmitter ID) written on the new tire pressure warning valve and transmitter when replacing the old one. Register the transmitter IDs in the tire pressure warning ECU after replacing the tire pressure warning valve and transmitter and installing the tires and wheels on the vehicle.
    
    Fig 2: Identifying Transmitter ID Number On Tire Pressure Warning Valve
    Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
    
    NOTE: The transmitter ID is written on the tire pressure warning valve and transmitter. It will be unable to be read after installing the tire onto the wheel. Therefore, take a note of the transmitter ID before installing the tire pressure warning valve and transmitter.
6. When replacing the tire pressure warning ECU and the tire pressure warning valve and transmitters:
  It is necessary to perform the registration (See REGISTRATION ).
7. Precautions about the tire pressure:
  - The tire pressure decreases naturally.
  - In winter, tire pressure may decrease due to low ambient temperature (tire pressure decreases by approximately 10 kPa (0.1 kgf/cm² , 1.45 psi) for every 10°C (50°F) drop in the ambient temperature).
  Therefore, the tire pressure warning system is more likely to operate if the tire pressure is not adjusted appropriately.
  
  If the daily temperature variation is large, pressurize the tires high so that the tire pressure is suitable under cold conditions. As a result, incorrect tire pressure warning operation should decrease.
IN CASE OF TIRE AND WHEEL REPLACEMENT
1. When tires and wheels are replaced, always be sure to register the transmitter IDs correctly.
FAIL-SAFE FUNCTION
1. When a system malfunction occurs in the tire pressure warning system, the tire pressure warning light comes on after blinking for 1 minute and informs the driver of the system failure.
2. The result of this diagnosis is stored in the tire pressure warning ECU.
CHECK TIRE PRESSURE AFTER REPAIRS
1. After repairs, confirm that the actual tire pressures are displayed in the Data List (See DATA LIST / ACTIVE TEST ).