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

WIRING DIAGRAM

B007SMIE01

INSPECTION PROCEDURE

Note


  • After replacing the center airbag sensor assembly, refer to initialization 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 A
      DTC is not output B

    A

    GO TO CAN COMMUNICATION SYSTEM Click here

    B

  2. CHECK HARNESS AND CONNECTOR (DLC3 - ECM)


    1. Turn the ignition switch off.

      B007V5TE03

    2. Disconnect the ECM connector.

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

      Standard Resistance
      for 1KD-FTV (w/ DPF)
      Tester Connection Condition Specified Condition
      B73-26 (TC) - H23-13 (TC) Always Below 1 Ω
      for 1KD-FTV (w/o DPF)
      Tester Connection Condition Specified Condition
      B72-26 (TC) - H23-13 (TC) Always Below 1 Ω
      for 2KD-FTV
      Tester Connection Condition Specified Condition
      B88-26 (TC) - H23-13 (TC) Always Below 1 Ω
      for 1TR-FE, 2TR-FE (w/ Dual VVT-i)
      Tester Connection Condition Specified Condition
      B94-33 (TC) - H23-13 (TC) Always Below 1 Ω
      for 1TR-FE, 2TR-FE (w/o Dual VVT-i)
      Tester Connection Condition Specified Condition
      B71-41 (TC) - H23-13 (TC) Always Below 1 Ω
      for 5L-E
      Tester Connection Condition Specified Condition
      B74-40 (TC) - H23-16 (BAT) Always Below 1 Ω
      Text in Illustration
      *A for 1KD-FTV (w/ DPF)
      *B for 1KD-FTV (w/o DPF)
      *C for 2KD-FTV
      *D for 1TR-FE, 2TR-FE
      *E for 5L-E
      *a

      Front view of wire harness connector

      (to ECM)
      *b Front view of DLC3

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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


    1. B007VS8E29
      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
      H23-4 (CG) - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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


    1. B007UMAE01
      Text in Illustration
      *A for 1KD-FTV (w/ DPF)
      *B for 1KD-FTV (w/o DPF)
      *C for 2KD-FTV
      *D for 1TR-FE, 2TR-FE
      *E for 5L-E
      *a

      Front view of wire harness connector

      (to ECM)

      Disconnect the ECM connector.

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

      Standard Resistance
      for 1KD-FTV (w/ DPF)
      Tester Connection Condition Specified Condition
      B73-26 (TC) - Body ground Always 1 MΩ or higher
      for 1KD-FTV (w/o DPF)
      Tester Connection Condition Specified Condition
      B12-26 (TC) - Body ground Always 1 MΩ or higher
      for 2KD-FTV
      Tester Connection Condition Specified Condition
      B88-26 (TC) - Body ground Always 1 MΩ or higher
      for 1TR-FE, 2TR-FE (w/ Dual VVT-i)
      Tester Connection Condition Specified Condition
      B94-33 (TC) - Body ground Always 1 MΩ or higher
      for 1TR-FE, 2TR-FE (w/o Dual VVT-i)
      Tester Connection Condition Specified Condition
      B71-41 (TC) - Body ground Always 1 MΩ or higher
      for 5L-E
      Tester Connection Condition Specified Condition
      B74-40 (TC) - Body ground Always 6 kΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR OR EACH ECU

    OK

    REPLACE CENTER AIRBAG SENSOR ASSEMBLY Click here