AIRBAG SYSTEM(for Type B) Diagnosis Circuit

DESCRIPTION

DTC output mode is set by connecting terminals TC and CG of the DLC3.

DTCs are output by the blinking of the SRS warning light.

Tech Tips


  • When each warning light continues blinking, a ground short in the wiring of terminal TC of the DLC3 or an internal ground short in each ECU is suspected.

  • A DTC output mode signal is transmitted through the CAN communication system to each ECU, including the airbag sensor assembly. Thus, when all systems do not enter DTC output mode, there may be an ECM malfunction.

WIRING DIAGRAM

B0024QOE01

CAUTION / NOTICE / HINT

Note


  • After turning the ignition switch off, waiting time may be required before disconnecting the cable from the negative (-) battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) battery terminal notices before proceeding with work.

    Click here

  • When disconnecting the cable from the negative (-) battery terminal while performing repairs, some systems need to be initialized after the cable is reconnected.

    Click here

  • After replacing the airbag sensor assembly, refer to initialization*.

    Click here

    *: w/ VSC

PROCEDURE


  1. CHECK CAN COMMUNICATION SYSTEM


    1. Check if a CAN communication DTC is output.

      for LHD: Click here

      for RHD: Click here

      Result
      Proceed to
      DTCs are output (for LHD)
      DTCs are output (for RHD)
      DTC is not output

    DTCs are output (for LHD)

    GO TO CAN COMMUNICATION SYSTEM Click here

    DTCs are output (for RHD)

    GO TO CAN COMMUNICATION SYSTEM Click here

    DTC is not output

  2. CHECK HARNESS AND CONNECTOR (DLC3 - ECM)


    1. Turn the ignition switch off.

      B0027N9C01
      *A for 1TR-FE, 2TR-FE *B for 1KD-FTV, 2KD-FTV
      *C for 1GD-FTV, 2GD-FTV *D for 1GR-FE
      *a

      Front view of wire harness connector

      (to ECM)

      		 *b Front view of DLC3

    2. Disconnect the connector from the ECM.

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

      Standard Resistance
      for 1TR-FE, 2TR-FE
      Tester Connection Condition Specified Condition
      G46-19 (TC) - G8-13 (TC) Always Below 1 Ω
      for 1KD-FTV, 2KD-FTV
      Tester Connection Condition Condition
      G84-11 (TC) - G8-13 (TC) Always Below 1 Ω
      for 1GD-FTV, 2GD-FTV
      Tester Connection Condition Condition
      G85-25 (TC) - G8-13 (TC) Always Below 1 Ω
      for 1GR-FE
      Tester Connection Condition Condition
      G87-6 (TC) - G8-13 (TC) Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. CHECK HARNESS AND CONNECTOR (DLC3 - BODY GROUND)


    1. B0026D8C27
      *a Front view of DLC3

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      G8-4 (CG) - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. CHECK HARNESS AND CONNECTOR (ECM - BODY GROUND)


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

      B0027LKC01
      *A for 1TR-FE, 2TR-FE *B for 1KD-FTV, 2KD-FTV
      *C for 1GD-FTV, 2GD-FTV *D for 1GR-FE
      *a

      Front view of wire harness connector

      (to ECM)

      		 - -
      Standard Resistance
      for 1TR-FE, 2TR-FE
      Tester Connection Condition Specified Condition
      G46-19 (TC) - Body ground Always 1 MΩ or higher
      for 1KD-FTV, 2KD-FTV
      Tester Connection Condition Specified Condition
      G84-11 (TC) - Body ground Always 1 MΩ or higher
      for 1GD-FTV, 2GD-FTV
      Tester Connection Condition Specified Condition
      G85-25 (TC) - Body ground Always 1 MΩ or higher
      for 1GR-FE
      Tester Connection Condition Specified Condition
      G87-6 (TC) - Body ground Always 1 MΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE AIRBAG SENSOR ASSEMBLY Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR OR EACH ECU