AIRBAG SYSTEM TC and CG Terminal Circuit

DESCRIPTION

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

The DTCs are displayed by blinking the SRS warning light.

Tech Tips


  • Make sure that DTCs which relate to the CAN communication system are not output. If any of these DTCs are output, check the CAN communication system Click here.

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

  • The DTC output mode signal is transmitted through the CAN to each ECU including the center airbag sensor assembly. Thus if no systems enter DTC output mode, the ECM may have a malfunction.

WIRING DIAGRAM

A0117KNE03

INSPECTION PROCEDURE

PROCEDURE


  1. CHECK HARNESS AND CONNECTOR (DLC3 - ECM)

    A0117LWE04
    Text in Illustration
    *A for 1KR-FE and 1NR-FE
    *B for 1ND-TV
    *1 Front view of DLC3
    *2

    Front view of wire harness connector

    (to ECM)

    1. Turn the ignition switch off.

    2. Disconnect the connector from the ECM.

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

      Standard Resistance
      for 1KR-FE and 1NR-FE
      Tester Connection Condition Specified Condition

      D47-13 (TC) -

      A18-40 (TC)

      		 Always Below 1 Ω
      for 1ND-TV
      Tester Connection Condition Specified Condition

      D47-13 (TC) -

      A19-24 (TC)

      		 Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  2. CHECK HARNESS AND CONNECTOR (CG OF DLC3 - BODY GROUND)


    1. A01175DE01
      Text in Illustration
      *1 Front view of DLC3

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

      Standard Resistance
      Tester Connection Condition Specified Condition

      D47-4 (CG) -

      Body ground

      		 Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. CHECK HARNESS AND CONNECTOR (TC OF ECM)


    1. A0117DGE03
      Text in Illustration
      *A for 1KR-FE and 1NR-FE
      *B for 1ND-TV
      *1

      Front view of wire harness connector

      (to ECM)

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

      Standard Resistance
      for 1KR-FE and 1NR-FE
      Tester Connection Condition Specified Condition

      A18-40 (TC) -

      Body ground

      		 Always 1 MΩ or higher
      for 1ND-TV
      Tester Connection Condition Specified Condition

      A19-24 (TC) -

      Body ground

      		 Always 1 MΩ or higher

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. REPLACE ECM


    1. Replace the ECM.

    2. Check for DTCs of the ECM.


      Result
      Result Proceed to
      Normal system code is output. A
      DTC is output (for 1KR-FE). B
      DTC is output (for 1NR-FE). C
      DTC is output (for 1ND-TV). D
      DTC output mode is set (except center airbag sensor assembly). E

    B

    GO TO INSPECTION PROCEDURE OF DTC OUTPUT Click here

    C

    GO TO INSPECTION PROCEDURE OF DTC OUTPUT Click here

    D

    GO TO INSPECTION PROCEDURE OF DTC OUTPUT Click here

    E

    REPLACE CENTER AIRBAG SENSOR ASSEMBLY Click here

    A

    END