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 stays 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

B00195DE05

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 center airbag sensor assembly, refer to initialization Click here.

PROCEDURE


  1. CHECK CAN COMMUNICATION SYSTEM


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

    2. Check if a CAN communication system DTC is output Click here.

      Result
      Result Proceed to
      DTC is not output A
      DTC is output (for LHD) B
      DTC is output (for RHD) C

    B

    REPAIR CIRCUITS INDICATED BY OUTPUT DTCS Click here

    C

    REPAIR CIRCUITS INDICATED BY OUTPUT DTCS Click here

    A

  2. CHECK HARNESS AND CONNECTOR (DLC3 - ECM)

    B0019JTE03

    1. Turn the engine switch off.

    2. Disconnect the A38*1, A87*2, A85*3 or A86*4 connector from the ECM.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      E22-13 (TC) - A38-43 (TC)*1 Always Below 1 Ω
      E22-13 (TC) - A87-43 (TC)*2 Always Below 1 Ω
      E22-13 (TC) - A85-27 (TC)*3 Always Below 1 Ω
      E22-13 (TC) - A86-27 (TC)*4 Always Below 1 Ω

      • *1: for LHD (3UR-FE)

      • *2: for RHD (3UR-FE)

      • *3: for LHD (1VD-FTV)

      • *4: for RHD (1VD-FTV)


    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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

    B0018WRE01
    *1 Front view of DLC3:

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      E22-4 (CG) - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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

    B001AKPE03

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A38-43 (TC)*1- Body ground Always Below 1 Ω
      A87-43 (TC)*2- Body ground Always Below 1 Ω
      A85-27 (TC)*3- Body ground Always Below 1 Ω
      A86-27 (TC)*4- Body ground Always Below 1 Ω

      • *1: for LHD (3UR-FE)

      • *2: for RHD (3UR-FE)

      • *3: for LHD (1VD-FTV)

      • *4: for RHD (1VD-FTV)


    OK

    REPLACE CENTER AIRBAG SENSOR ASSEMBLY Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR OR EACH ECU