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 through 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 ECM malfunction.

WIRING DIAGRAM

A01HQ28E03

INSPECTION PROCEDURE

PROCEDURE


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


    1. A01HQR8E03
      Text in Illustration
      *A for 2GR
      *B for 2AR
      *1 DLC3
      *a

      Front view of wire harness connector

      (to ECM)

      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 2GR:
      Tester Connection Condition Specified Condition
      I39-13 (TC) - A25-45 (TC) Always Below 1 Ω
      for 2AR:
      Tester Connection Condition Specified Condition
      I39-13 (TC) - A25-23 (TC) Always Below 1 Ω

    NG

    REPAIR OR REPLACE WIRE HARNESS

    OK

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


    1. A01HN20E20
      Text in Illustration
      *1 DLC3

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      I39-4 (CG) - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE WIRE HARNESS

    OK

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


    1. A01HN20E21
      Text in Illustration
      *1 DLC3

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      I39-13 (TC) - Body ground Always 1 MΩ or higher

    NG

    REPAIR OR REPLACE WIRE HARNESS OR REPLACE ECM

    OK

    REPLACE AIRBAG SENSOR ASSEMBLY Click here