SEAT BELT WARNING SYSTEM Driver Side Seat Belt Warning Light does not Operate

DESCRIPTION

When the ignition switch ON, the center airbag sensor assembly*1 (main body ECU [cowl side junction block LH]*2) transmits front seat inner belt state signals to the combination meter assembly through the CAN. If the driver seat belt is not fastened, the combination meter assembly blinks the driver side seat belt warning light. If the seat belt is fastened, the warning light goes off.

• *1: w/ Airbag System

• *2: w/o Airbag System

INSPECTION PROCEDURE

PROCEDURE

1. Click here

   CHECK VEHICLE TYPE

   
   

   1. Check vehicle type.

      Table 1. Result

      Result	Proceed to
      w/ Airbag System	A
      w/o Airbag System	B

   
   
   • AClick here
   • BClick here
2. Click here

   CHECK FOR DTC

   
   

   1. Check for DTCs.

      Table 2. Result

      Result	Proceed to
      DTC is not output	A
      CAN system DTC is output (for LHD)	B
      CAN system DTC is output (for RHD)	C
      Airbag system DTC is output	D

   
   
   • AClick here
   • BClick here
   • CClick here
   • DClick here
3. Click here

   READ VALUE USING INTELLIGENT TESTER (DRIVER SIDE BUCKLE SWITCH)

   
   

   1. Check the Data List for proper functioning of the driver side seat belt buckle switch.

      Table 3. SRS Airbag

      Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
      Driver Buckle SW	Driver side seat belt / Set, Unset or NG	Set: Driver side seat belt is fastened Unset: Driver side seat belt is unfastened	NG: Data is not determined

      Table 4. Result

      Result	Proceed to
      Set or Unset is displayed on the tester screen according to the driver side seat belt condition	A
      Set or Unset is not displayed normally on the tester screen according to the driver side seat belt condition	B
      NG is displayed on the tester screen	C

   
   
   • AClick here
   • BClick here
   • CClick here
4. Click here

   PERFORM ACTIVE TEST USING INTELLIGENT TESTER (DRIVER SIDE SEAT BELT WARNING LIGHT)

   
   

   1. Operate the intelligent tester according to the display and select Active Test.

      Table 5. Combination Meter

      Item	Test Part	Control Range	Diagnostic Note
      Driver Side Seat Belt	Driver side seat belt warning light	ON/OFF	Confirm that the vehicle is stopped and the engine is idling.

      OK
      Driver side seat belt warning light condition can be switched by Active Test.

      Table 6. Result

      Result	Proceed to
      OK	A
      NG (w/ Multi-information Display)	B
      NG (w/o Multi-information Display)	C

   
   
   • AClick here
   • BClick here
   • CClick here
5. Click here

   REPLACE CENTER AIRBAG SENSOR ASSEMBLY

   
   

   1. Temporarily replace the center airbag sensor assembly with a new one (Click here).

   
   
   • NEXTClick here
6. Click here

   CHECK DRIVER SIDE SEAT BELT WARNING LIGHT

   
   

   1. Check the driver side seat belt warning light function (Click here).

      OK
      Driver side seat belt warning light operates normally.

      Table 7. Result

      Result	Proceed to
      OK	A
      NG (w/ Multi-information Display)	B
      NG (w/o Multi-information Display)	C

   
   
   • AClick here
   • BClick here
   • CClick here
7. Click here

   CHECK FOR DTC

   
   

   1. Check for DTCs.

      Table 8. Result

      Result	Proceed to
      DTC is not output	A
      CAN system DTC is output (for LHD)	B
      CAN system DTC is output (for RHD)	C

   
   
   • AClick here
   • BClick here
   • CClick here
8. Click here

   READ VALUE USING INTELLIGENT TESTER (DRIVER SIDE BUCKLE SWITCH)

   
   

   1. Check the Data List for proper functioning of the driver side seat belt buckle switch.

      Table 9. Main Body

      Tester Display	Measurement Item/Range	Normal Condition	Diagnostic Note
      D Seat Buckle SW	Driver side seat belt / ON or OFF	ON: Driver side seat belt is fastened OFF: Driver side seat belt is unfastened	-

      OK
      The display is as specified in the normal condition column.

   
   
   • OKClick here
   • NGClick here
9. Click here

   PERFORM ACTIVE TEST USING INTELLIGENT TESTER (DRIVER SIDE SEAT BELT WARNING LIGHT)

   
   

   1. Operate the intelligent tester according to the steps on the display and select Active Test.

      Table 10. Combination Meter

      Item	Test Part	Control Range	Diagnostic Note
      Driver Side Seat Belt	Driver side seat belt warning light	ON/OFF	Confirm that the vehicle is stopped and the engine is idling.

      OK
      Driver side seat belt warning light condition can be switched by Active Test.

   
   
   • OKClick here
   • NGClick here
10. Click here

    INSPECT FRONT SEAT INNER BELT ASSEMBLY (for Driver Side)

    
    
    1. 

       Remove the front seat inner belt assembly (for Driver Side) (Click here).

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

       Standard Resistance
       Tester Connection Switch Condition Specified Condition 12 - 9 Seat belt unfastened (buckle switch is off) Below 1 Ω Seat belt fastened (buckle switch is on) 10 kΩ or higher

    
    
    • OKClick here
    • NGClick here
11. Click here

    CHECK HARNESS AND CONNECTOR (FRONT SEAT INNER BELT - COMBINATION METER AND BODY GROUND)

    
    

    1. Disconnect the K43*1 or L49*2 front seat inner belt assembly (for Driver Side) connector.

       
       

       • *1: for LHD

       • *2: for RHD

    2. Disconnect the E1 main body ECU (cowl side junction block LH) connector.

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

       Standard Resistance
       for LHD
       Tester Connection Condition Specified Condition K43-12 - E1-7 (DBKL) Always Below 1 Ω K43-12 or E1-7 (DBKL) - Body ground Always 10 kΩ or higher K43-9 - Body ground Always Below 1 Ω
       for RHD
       Tester Connection Condition Specified Condition L49-12 - E1-7 (DBKL) Always Below 1 Ω L49-12 or E1-7 (DBKL) - Body ground Always 10 kΩ or higher L49-9 - Body ground Always Below 1 Ω

    
    
    • OKClick here
    • NGClick here
12. Click here

    REPLACE MAIN BODY ECU (COWL SIDE JUNCTION BLOCK LH)

13. Click here

    Go to CAN COMMUNICATION SYSTEMClick here

14. Click here

    Go to CAN COMMUNICATION SYSTEMClick here

15. Click here

    Go to AIRBAG SYSTEMClick here

16. Click here

    REPLACE FRONT SEAT INNER BELT ASSEMBLY (for Driver Side)Click here

17. Click here

    REPLACE CENTER AIRBAG SENSOR ASSEMBLYClick here

18. Click here

    REPLACE COMBINATION METERClick here

19. Click here

    REPLACE COMBINATION METERClick here

20. Click here

    REPLACE COMBINATION METER ASSEMBLYClick here

21. Click here

    REPLACE COMBINATION METER ASSEMBLYClick here

22. Click here

    END (CENTER AIRBAG SENSOR ASSEMBLY IS DEFECTIVE)

23. Click here

    Go to CAN COMMUNICATION SYSTEMClick here

24. Click here

    Go to CAN COMMUNICATION SYSTEMClick here

25. Click here

    REPLACE COMBINATION METER ASSEMBLYClick here

26. Click here

    REPLACE MAIN BODY ECU (COWL SIDE JUNCTION BLOCK LH)

27. Click here

    REPLACE FRONT SEAT INNER BELT ASSEMBLY (for Driver Side)Click here

28. Click here

    REPAIR OR REPLACE HARNESS OR CONNECTOR