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 center airbag sensor. Thus, when all systems do not enter DTC output mode, there may be an ECM malfunction.

WIRING DIAGRAM

A01DTNTE01

INSPECTION PROCEDURE

Note


  • After turning the ignition switch off, waiting time may be required before disconnecting the cable from the battery terminal. Therefore, make sure to read the disconnecting the cable from the battery terminal notice 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.

PROCEDURE


  1. CHECK CAN COMMUNICATION SYSTEM


    1. Check if a CAN communication system DTC is output.

      Result
      Result Proceed to
      DTCs are output (for LHD with Entry and Start System) A
      DTCs are output (for LHD without Entry and Start System) B
      DTCs are output (for RHD with Entry and Start System) C
      DTCs are output (for RHD without Entry and Start System) D
      DTC is not output E

    A

    REPAIR CIRCUITS INDICATED BY OUTPUT DTCS (for LHD with Entry and Start System) Click here

    B

    REPAIR CIRCUITS INDICATED BY OUTPUT DTCS (for LHD without Entry and Start System) Click here

    C

    REPAIR CIRCUITS INDICATED BY OUTPUT DTCS (for RHD with Entry and Start System) Click here

    D

    REPAIR CIRCUITS INDICATED BY OUTPUT DTCS (for RHD without Entry and Start System) Click here

    E

  2. CHECK HARNESS AND CONNECTOR (DLC3 - ECM)


    • *1: for 1GR-FE

    • *2: for 2TR-FE


    1. A01DT5UE02
      Text in Illustration
      *A for 1GR-FE
      *B for 2TR-FE
      *a Front view of DLC3
      *b

      Front view of wire harness connector

      (to ECM)

      Turn the ignition switch off.

    2. Disconnect the G56*1, G60*2 connector from the ECM.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      G48-13 (TC) - G56-28 (TC)*1 Always Below 1 Ω
      G48-13 (TC) - G60-13 (TC)*2 Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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


    1. A01DNBXE06
      Text in Illustration
      *a Front view of DLC3

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      G48-4 (CG) - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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


    • *1: for 1GR-FE

    • *2: for 2TR-FE


    1. A01DSYJE02
      Text in Illustration
      *A for 1GR-FE
      *B for 2TR-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
      G56-28 (TC)*1 - Body ground Always 1 MΩ or higher
      G60-13 (TC)*2 - Body ground Always 1 MΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR OR EACH ECU

    OK

    REPLACE CENTER AIRBAG SENSOR ASSEMBLY Click here