TIRE PRESSURE WARNING SYSTEM PRECAUTION


  1. PRECAUTION FOR DISCONNECTING CABLE FROM NEGATIVE AUXILIARY BATTERY TERMINAL

    Note

    When disconnecting the cable from the negative (-) auxiliary battery terminal, initialize the following systems after the cable is reconnected.

    System Name See Procedure
    Lane Departure Alert System (w/ Steering Control)

    Click here

    Parking Assist Monitor System (w/ Parallel Parking Assist Function)
    Parking Assist Monitor System (w/o Parallel Parking Assist Function)
    Pre-collision System
    Air Conditioning System

  2. TIRE PRESSURE WARNING ECU AND RECEIVER EXPRESSIONS


    1. The type of tire pressure warning ECU and receiver used on this model differs according to the specifications of the vehicle. The expressions listed in the table below are used in this section.

      Vehicle Specification Part Name in Manual Actual Part Name
      for FMVSS138 Type Tire pressure warning ECU and receiver Door control and tire pressure monitoring system receiver assembly
      for ECE-R64 Type Tire pressure monitor receiver assembly

  3. TIRE PRESSURE WARNING SYSTEM PRECAUTION


    1. It is necessary for the tire pressures to be adjusted periodically because tire pressure decreases naturally over time.

    2. In winter, tire pressure may decrease due to low ambient temperatures (tire pressure decreases by approximately 10 kPa (0.1 kgf/cm2, 1.5 psi) for every 10°C (18°F) drop in the ambient temperature). Therefore, the tire pressure warning system is more likely to indicate a warning if the tire pressures are not adjusted appropriately. If the daily temperature variation is large, increase the pressure of the tires so that the tire pressures are suitable under cold conditions. As a result, unnecessary tire pressure warning operations should decrease.

    3. Depending on the tire type, the system may not function properly even if the specified wheels are used.

    4. To prevent damage to the tire pressure warning valve and transmitter, make sure that the tire pressure warning valve and transmitter does not interfere with the tire bead when installing or removing a tire.

    5. To prevent damage to the tire pressure warning valve and transmitter, before disengaging the tire bead or removing the tire from the wheel, drop the tire pressure warning valve and transmitter into the wheel.

    6. Always use a new grommet and valve core when installing a tire pressure warning valve and transmitter to ensure the sealing performance.

    7. When one or more of the tire pressure warning valve and transmitters or the tire pressure warning ECU and receiver is replaced, the transmitter IDs for all of the tire pressure warning valve and transmitters must be re-registered. Before registering the transmitter ID of the new tire pressure warning valve and transmitter, check the Data List and record all of the transmitter IDs that are already registered.

    8. Use only a specified cap. If an unspecified cap is used, it may seize to the tire pressure warning valve and transmitter.

    9. The system is disabled under the following conditions (when the condition returns to normal, the system will work properly).


      1. When all of the tire and wheel assemblies that have tire pressure warning valve and transmitters registered with the tire pressure warning ECU and receiver have not been installed.

      2. When all of the transmitter ID codes are not registered with the tire pressure warning ECU and receiver.

      3. When the tire pressure is abnormally high (absolute pressure: 480 kPa (4.9 kgf/cm2, 70 psi) or more; relative pressure: 380 kPa (3.9 kgf/cm2, 55 psi) or more).

      4. When the tire pressure warning valve and transmitter battery is depleted.

    10. The system may become disabled under the following conditions (when the condition returns to normal, the system will work properly).


      1. When electric devices or facilities using similar radio frequencies are nearby.

      2. When a wireless device or other equipment operating at a similar frequency is in use in the vehicle.

      3. When a window tint that affects radio wave signals is installed.

      4. When there is a lot of snow or ice on the vehicle, in particular, around the wheels or wheel housing.

      5. When non-genuine wheels are used.

      6. When tire chains are used.

      7. When aftermarket tire repair sealant is used.

        CAUTION:

        After use of tire repair sealant, replacement of the tire pressure warning valve and transmitter is required to ensure normal system operation. (Normal system operation cannot be ensured by only repairing or replacing the tire.)

    11. w/ ID Switching Function:


      1. If ID switching (Main ←→ 2nd) is performed, the data stored inside the tire pressure warning ECU and receiver is reset.

        Note

        If the tire pressure warning system is malfunctioning, make sure to perform troubleshooting for the system before performing ID switching (Main ←→ 2nd). (Make sure to perform ID switching after the malfunction has been resolved.)

      2. It is not possible to perform ID switching if only the main set of tires is registered.

      3. Whether the vehicle is equipped with an ID switching function or not can be determined by reading the Data List.

        Click here