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 each warning light stays blinking, a ground short in the wiring of terminal TC of the DLC3 or an internal ground short in each ECU is suspected.

  • A DTC output mode signal is transmitted through the CAN communication system to each ECU including the center airbag sensor assembly. Thus when all systems do not enter DTC output mode, there may be an power management control ECU (HV CPU) malfunction.

WIRING DIAGRAM

A01NFRSE03

INSPECTION PROCEDURE

PROCEDURE


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


    1. Turn the power switch off.

    2. A01NELLE01
      Text in Illustration
      *1

      Front view of wire harness connector

      (to DLC3)
      *2

      Front view of wire harness connector

      (to Power Management Control ECU (HV CPU))

      Disconnect the connector from the power management control ECU (HV CPU).

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      F17-13 (TC) - F97-11 (TC) Always Below 1 Ω

    NG

    REPLACE WIRE HARNESS

    OK

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


    1. A01ND25E01
      Text in Illustration
      *1

      Front view of wire harness connector

      (to DLC3)

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      F17-4 (CG) - Body ground Always Below 1 Ω

    NG

    REPLACE WIRE HARNESS

    OK

  3. CHECK WIRE HARNESS (TC OF DCL3 - BODY GROUND)


    1. A01ND25E02
      Text in Illustration
      *1

      Front view of wire harness connector

      (to DLC3)

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      F17-13 (TC) - Body ground Always 1 MΩ or higher

    NG

    REPLACE WIRE HARNESS OR EACH ECU

    OK

    REPLACE CENTER AIRBAG SENSOR ASSEMBLY Click here