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Home >> Toyota >> 2021 >> Highlander LE, 4WD >> Repair and Diagnosis >> Suspension >> Wheels & Tire System >> Tire Pressure Warning System - Diagnostics - Introduction (1 Of 2) >> Tire Pressure Warning System >> Diagnosis System [12/2019 - 11/2023] >> Diagnosis System [12/2019 - 11/2023]

Diagnosis System [12/2019 - 11/2023]

  1. CHECK WARNING LIGHT 
    NOTE:
    • When there is a problem with the tire pressure warning system, the tire pressure warning light blinks at 0.5 second intervals, and illuminates after 1 minute.
    • When the malfunction has been corrected, the tire pressure warning light goes off.
    • When the tire pressure warning light illuminates, immediately check the tire pressure of the tires and adjust them to the specified value.
    • After the ignition switch is turned to ON, the tire pressure warning light illuminates for 3 seconds and then goes off. If the warning light does not illuminate for 3 seconds, proceed to the troubleshooting for the tire pressure warning light circuit.

      Refer to Tire Pressure Warning Light Circuit [12/2019 - 10/2022] , or refer to Tire Pressure Warning Light Circuit [10/2022 - 11/2023]

    1. Turn the ignition switch to ON.
      GTY440276Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *1 Tire Pressure Warning Light
    2. Check that the tire pressure warning light illuminates for 3 seconds.
  2. WHAT TO CONSIDER WHEN TIRE PRESSURE WARNING LIGHT ILLUMINATES 
    1. When the tire pressure warning light does not go off, or when it illuminates during driving, check the tire pressure. If the tire pressure warning light illuminates within several hours after adjusting the tire pressure, a tire may have a slow air leak.
    2. 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 warning valve and transmitter battery is depleted (Battery life is 10 years).
    3. 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.
        WARNING:

        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.)

  3. TIRE PRESSURE WARNING LIGHT AND INDICATOR CHART 

    HINT: 

    The table below indicates the state of the tire pressure warning light after the ignition switch is turned to ON.

      Immediately after turning the ignition switch to ON Always
    Warning light output pattern Multi-information Display Condition
    Illuminates for 3 sec. Illuminates for 4 sec. Goes off Illuminates Blinks Displays
    Normal ◦ - ◦ - - -
    Low tire pressure ◦ - - ◦ - Tire Pressure Low Check Tire
    System failure ◦ - - - *1 TPWS Malfunction Visit Your Dealer

    HINT: 

    • Message is displayed only when the tire pressure warning system screen is displayed.
    • TPWS is an abbreviation for Tire Pressure Warning System.
    Test mode (signal check mode) ◦ - - - *2 -
    Tire pressure initialization - ◦ ◦ - *3 Setting Tire Pressure Warning System
    Tire position identification in progress ◦ - ◦ - - -
    ECU connector poorly connected - - - - *4 -
    ID certification, automatic ID registration ◦ - - - *1 Tire Pressure Recalibrating Please Wait until Complete
    1. *1: Blinks at 0.5 second intervals, and remains illuminated after 1 minute.
      GTY439044Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a ON
      *b OFF
      *c 0.5 sec.
      *d 1 minute
    2. *2: Blinks at 0.125 second intervals.
      GTY440225Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a ON
      *b OFF
      *c 0.125 sec.
    3. *3: Blinks 3 times at 1 second intervals.
      GTY451501Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a ON
      *b OFF
      *c 1 sec.
    4. *4: Goes off for 10 seconds to check the connection of the ECU connector, and then blinks at 0.5 second intervals, and remains illuminated after 1 minute.
      GTY437250Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
      *a ON
      *b OFF
      *c 0.5 sec.
      *d 1 minute
      *e 10 sec.
  4. NORMAL MODE DTC 
    1. DTCs are stored in the tire pressure warning ECU and receiver and output by blinking the tire pressure warning light or by using the GTS.

      Refer to DTC CHECK / CLEAR [12/2019 - 11/2023] 

  5. TEST MODE (SIGNAL CHECK MODE) DTC 
    1. By switching from normal mode into test mode (signal check mode), the tire pressure warning ECU and receiver, each tire pressure warning valve and transmitter and tire pressure warning reset switch can be inspected.

      Refer to TEST MODE PROCEDURE [12/2019 - 11/2023] 

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