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 airbag sensor assembly. Thus if no systems enter DTC output mode, the Power management control ECU may have a malfunction.

WIRING DIAGRAM

A004FAYE02
*a Airbag Sensor Assembly
*b Power Management Control ECU
*c CAN Communication Line

PROCEDURE


  1. CHECK HARNESS AND CONNECTOR (DLC3 - POWER MANAGEMENT CONTROL ECU)

    A004ESJE02
    Text in Illustration
    *1 DLC3
    *a

    Front view of wire harness connector

    (to Power Management Control ECU)

    1. Turn the ignition switch off.

    2. Disconnect the connector from the Power Management Control ECU.

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

      Standard Resistance
      Tester Connection Condition Specified Condition

      F3-13 (TC) -

      F55-11 (TC)

      		 Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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


    1. A004EH4E01
      Text in Illustration
      *1 DLC3

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

      Standard Resistance
      Tester Connection Condition Specified Condition

      F3-4 (CG) -

      Body ground

      		 Always Below 1 Ω

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

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


    1. A004EOWE01
      Text in Illustration
      *1 DLC3

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

      Standard Resistance
      Tester Connection Condition Specified Condition

      F3-13 (TC) -

      Body ground

      		 Always 1 MΩ or higher

    OK

    REPAIR AIRBAG SENSOR ASSEMBLY Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR OR EACH ECU