TIRE PRESSURE WARNING SYSTEM, Diagnostic DTC:B1247

DTC Code DTC Name
B1247 Tire Pressure Monitor Receiver Communication Stop

DESCRIPTION

The main body ECU (multiplex network body ECU) and tire pressure warning ECU and receiver are connected using 2 direct lines that they use to communicate with each other.

DTC No. Detection Item DTC Detection Condition Trouble Area
B1247 Tire Pressure Monitor Receiver Communication Stop In diagnostic mode, an applicable RDA signal cannot be received within 10 seconds after a PRG signal is sent from the main body ECU (multiplex network body ECU).

  • Tire pressure warning ECU and receiver

  • Wire harness or connector

  • Main body ECU (multiplex network body ECU)

  • ECU-IG NO. 2 fuse*1

  • Backup boost converter circuit*2

WIRING DIAGRAM

A01KD6GE04

CAUTION / NOTICE / HINT

Note


  • When replacing the tire pressure warning ECU and receiver, read the 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 after the ECU has been replaced.

  • When replacing the main body ECU (multiplex network body ECU), make sure to replace it with a new one.

Tech Tips

w/o Stop and Start System:

Inspect the fuses for circuits related to this system before performing the following inspection procedure.

PROCEDURE


  1. CHECK HARNESS AND CONNECTOR (MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) - TIRE PRESSURE WARNING ECU AND RECEIVER)


    1. Disconnect the tire pressure warning ECU and receiver M30 connector and main body ECU (multiplex network body ECU) G78 connector.

    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      M30-4 (RDA2) - G78-16 (RDA) Always Below 1 Ω
      M30-4 (RDA2) or G78-16 (RDA) - Body ground Always 10 kΩ or higher
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  2. CHECK HARNESS AND CONNECTOR (POWER SOURCE OF TIRE PRESSURE WARNING ECU AND RECEIVER)


    1. Disconnect the tire pressure warning ECU and receiver M30 connector.

    2. A01KC3LC27
      *a

      Front view of wire harness connector

      (to Tire Pressure Warning ECU and Receiver)

      Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      M30-12 (GND) - Body ground Always Below 1 Ω

    3. Measure the voltage according to the value(s) in the table below.

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      M30-1 (IG) - Body ground Ignition switch ON 10 to 16 V
      Result
      Proceed to
      OK
      NG (w/o Stop and Start System)
      NG (w/ Stop and Start System)

    NG (w/o Stop and Start System)

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    NG (w/ Stop and Start System)

    INSPECT STOP AND START SYSTEM (BACKUP BOOST CONVERTER CIRCUIT) for 1AD-FTV: Click here
    INSPECT STOP AND START SYSTEM (BACKUP BOOST CONVERTER CIRCUIT) for 3ZR-FAE: Click here

    OK

  3. REPLACE TIRE PRESSURE WARNING ECU AND RECEIVER


    1. Replace the tire pressure warning ECU and receiver.

      Click here

      Result
      Proceed to
      NEXT

    NEXT

  4. CHECK DTC OUTPUT (B1247)


    1. Clear the DTCs.

      Click here


      Body Electrical > Main Body > Clear DTCs

    2. Turn the ignition switch off.

    3. Turn the ignition switch to ON.

    4. Check for DTCs.

      Click here


      Body Electrical > Main Body > Trouble Codes
      OK
      DTC B1247 is not output.
      Result
      Proceed to
      OK
      NG

    OK

    END

    NG

    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) for LHD: Click here
    REPLACE MAIN BODY ECU (MULTIPLEX NETWORK BODY ECU) for RHD: Click here