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 canceled 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

A01HU17E02

INSPECTION PROCEDURE

Note


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

  • It is necessary to perform 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 Click here.

      Result
      Result Proceed to
      DTC is not output. A
      DTC is output. B

    B

    GO TO CAN COMMUNICATION SYSTEM Click here

    A

  2. CHECK DTC OUTPUT (B1247)


    1. Clear the DTCs Click here.

    2. Turn the power switch off.

    3. Turn the power 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 power switch off.

    2. Connect the Techstream to the DLC3.

    3. Turn the power switch on (IG).

    4. Turn the Techstream 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 Techstream.

      Combination Meter
      Tester Display Test Part Control Range Diagnostic Note
      Indicat. Tire Pressure Warning System Tire pressure warning light Tire pressure warning light OFF or ON -
      OK
      The tire pressure warning light turns on or off in accordance with the Techstream operation.

    NG

    GO TO METER / GAUGE SYSTEM Click here

    OK

    REPLACE TIRE PRESSURE WARNING ECU AND RECEIVER Click here