AIRBAG SYSTEM 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 ECU assembly. Thus, when all systems do not enter DTC output mode, there may be a hybrid vehicle control ECU malfunction.

WIRING DIAGRAM

B006L3BE10

CAUTION / NOTICE / HINT

Note


  • After turning the engine 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 ECU assembly, refer to initialization.

    Click here

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
      DTC is not output

    DTCs are output

    GO TO CAN COMMUNICATION SYSTEM for LHD: GO TO CAN COMMUNICATION SYSTEM Click here
    GO TO CAN COMMUNICATION SYSTEM for RHD: GO TO CAN COMMUNICATION SYSTEM Click here

    DTC is not output

  2. CHECK HARNESS AND CONNECTOR (DLC3 - ECM)


    1. B006Q30C11
      *A for 2AR-FE
      *B for 2GR-FE
      *a

      Front view of wire harness connector

      (to ECM)
      *b Front view of DLC3

      Turn the engine switch off.

    2. Disconnect the connector from the ECM.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      G9-13 (TC) - A53-33 (TC)*1 Always Below 1 Ω
      G9-13 (TC) - A53-45 (TC)*2 Always Below 1 Ω
      *1: for 2AR-FE
      *2: for 2GR-FE
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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


    1. B006NBGC22
      *a Front view of DLC3

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      G9-4 (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. B006PVKC16
      *A for 2AR-FE
      *B for 2GR-FE
      *a

      Front view of wire harness connector

      (to ECM)

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A53-33 (TC) - Body ground*1 Always Below 1 Ω
      A53-45 (TC) - Body ground*2 Always Below 1 Ω
      *1: for 2AR-FE
      *2: for 2GR-FE
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE AIRBAG ECU ASSEMBLY w/ Navigation System: REPLACE AIRBAG ECU ASSEMBLY Click here
    REPLACE AIRBAG ECU ASSEMBLY w/o Navigation System: REPLACE AIRBAG ECU ASSEMBLY Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR OR EACH ECU