Airbag System Tc And Cg Terminal Circuit

Restraints. Lexus Gs430, Gs300. Uzs190 Grs190
Supplemental Restraint System. Lexus Gs430, Gs300. Uzs190 Grs190

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

CHECK WIRE HARNESS (DLC3 - ECM)

CHECK WIRE HARNESS (CG OF DLC3 - BODY GROUND)

CHECK WIRE HARNESS (TC OF ECM)

REPLACE ECM

AIRBAG SYSTEM - TC and CG Terminal Circuit


DESCRIPTION

DTC output mode is set by connecting terminals TC and CG of the DLC3.
The DTCs are displayed by blinking the SRS warning light.
HINT:
  1. Make sure that DTC B1281 has not been output. If DTC B1281 has been output, refer to the multiplex communication system.
  2. When each warning light keeps blinking, a short to ground in the wiring of terminal TC of the DLC3 or an internal ground short in each ECU is suspected.
  3. The DTC output mode signal is transmitted through BEAN to each ECU including the center airbag sensor assembly, except for the skid control ECU with actuator. Thus when all system except the VSC system do not enter DTC output mode, it can be suspected that there is an ECM malfunction.

WIRING DIAGRAM


Lexus Gs430, Gs300. Uzs190 Grs190.Supplemental Restraint System.Airbag System.Airbag System Tc And Cg Terminal Circuit


INSPECTION PROCEDURE

1.CHECK WIRE HARNESS (DLC3 - ECM)


    Lexus Gs430, Gs300. Uzs190 Grs190.Supplemental Restraint System.Airbag System.Airbag System Tc And Cg Terminal Circuit

  1. Turn the engine switch off.



    Lexus Gs430, Gs300. Uzs190 Grs190.Supplemental Restraint System.Airbag System.Airbag System Tc And Cg Terminal Circuit

  1. Disconnect the connectors from the center airbag sensor assembly.

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

    Resistance:
    Tester connection
    		Condition
    		Specified condition
    L16-13 (TC) -
    A7-3 (TC)
    		Always
    		Below 1 Ω


NG
REPAIR OR REPLACE WIRE HARNESS (TC OF DLC3 - TC OF ECM)
OK


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


    Lexus Gs430, Gs300. Uzs190 Grs190.Supplemental Restraint System.Airbag System.Airbag System Tc And Cg Terminal Circuit

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

    Resistance:
    Tester connection
    		Condition
    		Specified condition
    L16-4 (CG) -
    Body ground
    		Always
    		Below 1 Ω


NG
REPAIR OR REPLACE WIRE HARNESS (CG OF DLC3 - BODY GROUND)
OK


3.CHECK WIRE HARNESS (TC OF ECM)


    Lexus Gs430, Gs300. Uzs190 Grs190.Supplemental Restraint System.Airbag System.Airbag System Tc And Cg Terminal Circuit

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

    Resistance:
    Tester connection
    		Condition
    		Specified condition
    A7-3 (TC) -
    Body ground
    		Always
    		1 MΩ or higher


NG
REPAIR OR REPLACE WIRE HARNESS OR EACH ECU
OK


4.REPLACE ECM

  1. Replace the ECM.

  1. Check the DTC of the ECM (Click here , Click here or Click here).

    Result:
    A:
    Normal system code is output.
    B:
    DTC is output.
    C:
    DTC output mode is set (except center airbag sensor assembly).


A
END

B
GO TO INSPECTION PROCEDURE OF DTC OUTPUT
C

REPLACE CENTER AIRBAG SENSOR ASSEMBLY