AIRBAG SYSTEM TC and CG Terminal Circuit

DESCRIPTION

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

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

WIRING DIAGRAM

A017CG3E15

INSPECTION PROCEDURE

PROCEDURE


  1. CHECK CAN COMMUNICATION SYSTEM


    1. Use the intelligent tester to check if the CAN communication system is functioning normally.

      Tech Tips


      • Refer to "Bus Check" of the CAN communication system Click here.

      • The center airbag sensor assembly is connected to the CAN communication system. Therefore, before starting troubleshooting, make sure to check that there is no trouble in the CAN communication system.

      Result
      Condition Proceed to
      DTC is not output A
      DTC is output B

    B

    GO TO CAN COMMUNICATION SYSTEM Click here

    A

  2. CHECK WIRE HARNESS (TC OF DLC3 - TC OF ECM)


    1. A017EAFE05

      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
      Tester Connection Switch Condition Specified Condition
      D43-13 (TC) - D55-28 (TC) Always Below 1 Ω

    NG

    REPLACE WIRE HARNESS (TC OF DLC3 - TC OF ECM)

    OK

  3. CHECK WIRE HARNESS (CG OF DLC3 - BODY GROUND)


    1. A017CQ6E02

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

      Standard resistance
      Tester Connection Switch Condition Specified Condition
      D43-4 (CG) - Body ground Always Below 1 Ω

    NG

    REPLACE WIRE HARNESS (CG OF DLC3 - BODY GROUND)

    OK

  4. CHECK WIRE HARNESS (TC OF DCL3 - BODY GROUND)


    1. A017CQ6E01

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

      Standard resistance
      Tester Connection Switch Condition Specified Condition
      D43-13 (TC) - Body ground Always 1 MΩ or higher

    NG

    REPLACE WIRE HARNESS OR EACH ECU

    OK

    REPLACE CENTER AIRBAG SENSOR ASSEMBLY Click here