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 multiple warning lights in the combination meter blink continuously, a ground short in the wiring or an ECU connected to terminal TC of the DLC3 is suspected.

  • A DTC output mode signal is transmitted via the CAN communication system to each ECU including the airbag sensor assembly. Thus when multiple systems do not enter DTC output mode, there may be a power management control ECU malfunction.

WIRING DIAGRAM

A01MT16E21
*a Airbag Sensor Assembly
*b Power Management Control ECU
*c CAN Communication Line

PROCEDURE


  1. CHECK WIRE HARNESS (TC OF DLC3 - TC OF POWER MANAGEMENT CONTROL ECU)


    1. A01MT3OC01
      *1 DLC3
      *a

      Front view of wire harness connector

      (to Power Management Control ECU)

      Turn the power 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
      K9-13 (TC) - K33-8 (TC) Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE WIRE HARNESS

    OK

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


    1. A01MSA8C15
      *1 DLC3

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      K9-4 (CG) - Body ground Always Below 1 Ω
      Result
      Proceed to
      OK
      NG

    NG

    REPAIR OR REPLACE WIRE HARNESS

    OK

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


    1. A01MSA8C16
      *1 DLC3

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      K9-13 (TC) - Body ground Always 1 MΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE AIRBAG SENSOR ASSEMBLY Click here

    NG

    REPAIR OR REPLACE WIRE HARNESS OR REPLACE EACH ECU