TIRE PRESSURE WARNING SYSTEM Tire Pressure Warning Light Circuit

DESCRIPTION

If the tire pressure warning ECU and receiver detects any problems, the tire pressure warning light blinks (stays on after blinking for 1 minute) and tire pressure monitoring is cancelled at the same time. At this time, the ECU stores a DTC in memory.

Connecting terminals TC and CG of the DLC3 makes the tire pressure warning light blink to output DTCs.

The tire pressure warning ECU and receiver sends the tire pressure warning light illumination request signal to the main body ECU (multiplex network body ECU) via a direct line. The main body ECU (multiplex network body ECU) then sends the signal to the combination meter assembly via CAN communication.

WIRING DIAGRAM

A01FGNBE01

INSPECTION PROCEDURE

Note


  • When replacing the tire pressure warning ECU and receiver, read the transmitter IDs stored in the old ECU using the GTS and write them down before removal.

  • It is necessary to perform initialization Click here after registration Click here of the transmitter IDs into the tire pressure warning ECU and receiver if the ECU has been replaced.

PROCEDURE


  1. CHECK FOR DTC (CAN COMMUNICATION SYSTEM)


    1. Check if a CAN communication system DTC is output (for LHD: Click here, for RHD: Click here.

      Result
      Result Proceed to
      DTC is not output. A
      DTC is output (for LHD). B
      DTC is output (for RHD). C

    B

    GO TO CAN COMMUNICATION SYSTEM Click here

    C

    GO TO CAN COMMUNICATION SYSTEM Click here

    A

  2. CHECK DTC OUTPUT (B1247)


    1. Clear the DTCs Click here.

    2. Turn the engine switch off.

    3. Turn the engine switch on (IG).

    4. Check for DTCs Click here.

      OK
      DTC B1247 is not output.

    NG

    GO TO DTC B1247 Click here

    OK

  3. CHECK OPERATION OF TIRE PRESSURE WARNING LIGHT (ACTIVE TEST)


    1. Turn the engine switch off.

    2. Connect the GTS to the DLC3.

    3. Turn the engine switch on (IG).

    4. Turn the GTS on.

    5. Enter the following menus: Body Electrical / Combination Meter / Active Test.

    6. Check the condition of the tire pressure warning light by using the GTS.

      Combination Meter
      Tester Display Test Part Control Range Diagnostic Note
      Indicat. Tire Pressure Warning System Tire pressure warning light OFF or ON Confirm that the vehicle is stopped with the engine idling.
      OK
      The tire pressure warning light turns on or off in accordance with the GTS operation.
      Result
      Result Proceed to
      NG A
      OK (for FMVSS138 Type) B
      OK (for ECE-R64 Type) C

    B

    REPLACE TIRE PRESSURE WARNING ECU AND RECEIVER Click here

    C

    REPLACE TIRE PRESSURE WARNING ECU AND RECEIVER Click here

    A

    GO TO METER / GAUGE SYSTEM Click here