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 ECU assembly. Thus when multiple systems do not enter DTC output mode, there may be a power management control ECU malfunction.

WIRING DIAGRAM

A005D8WE03
*a Power Management Control ECU
*b Airbag ECU Assembly
*c CAN Communication Line

PROCEDURE


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


    1. A005ELZE01
      Text in Illustration
      *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
      L61-13 (TC) - L5-11 (TC) Always Below 1 Ω

    NG

    REPAIR OR REPLACE WIRE HARNESS

    OK

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


    1. A005BQZE01
      Text in Illustration
      *1 DLC3

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      L61-4 (CG) - Body ground Always Below 1 Ω

    NG

    REPAIR OR REPLACE WIRE HARNESS

    OK

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


    1. A005BMAE01
      Text in Illustration
      *1 DLC3

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      L61-13 (TC) - Body ground Always 1 MΩ or higher

    OK

    REPLACE AIRBAG ECU ASSEMBLY Click here

    NG

    REPAIR OR REPLACE WIRE HARNESS OR REPLACE EACH ECU