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 short to ground in the wiring or an ECU connected to terminal TC of the DLC3 is suspected.

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

WIRING DIAGRAM

B0072XHE27

PROCEDURE


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


    1. Turn the engine switch off.

      B007474C03
      *A for 2GR-FSE *B for 8AR-FTS
      *1 DLC3 - -
      *a

      Front view of wire harness connector

      (to ECM)

      		 - -

    2. Disconnect the connector from the ECM.

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

      Standard Resistance
      for 2GR-FSE:
      Tester Connection Condition Specified Condition
      O8-13 (TC) - A71-21 (TC) Always Below 1 Ω
      for 8AR-FTS:
      Tester Connection Condition Specified Condition
      O8-13 (TC) - A91-33 (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. B00775CC36
      *1 DLC3

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      O8-4 (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. B00775CC37
      *1 DLC3

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      O8-13 (TC) - Body ground Always 1 MΩ or higher
      Result
      Proceed to
      OK
      NG

    OK

    REPLACE AIRBAG ECU ASSEMBLY Click here

    NG

    REPAIR OR REPLACE WIRE HARNESS OR REPLACE EACH ECU