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

for Preparation Click here


DESCRIPTION

When the ignition switch is ON, the main body ECU communicates the status of the front seat inner belt (driver side) to the combination meter assembly using the CAN communication line. When the seat belt is unfastened, the combination meter assembly flashes the driver side seat belt warning light on the combination meter assembly. When the seat belt is fastened, the combination meter assembly stops flashing the warning light.

WIRING DIAGRAM


B214266E01


INSPECTION PROCEDURE

NOTICE:
Since the seat belt warning system has functions that use CAN communication, first confirm that there is no malfunction in the communication system by inspecting the CAN communication functions in accordance with How to Proceed with Troubleshooting. Then conduct the following troubleshooting procedure.

1.PERFORM ACTIVE TEST USING INTELLIGENT TESTER (DRIVER SIDE SEAT BELT)

  1. Connect the intelligent tester to the DLC3.

  1. Turn the ignition switch to ON.

  1. Turn the tester on.

  1. Enter the following menus: Body / Combination Meter / Active Test.

  1. According to the display on the tester, perform the Active Test.

    Combination Meter 
    Item
    		Test Part
    		Control Range
    		Diagnostic Note
    Driver Side Seat Belt
    		Driver side seat belt warning light
    		ON / OFF
    		-

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



NG
REPLACE COMBINATION METER ASSEMBLY (Click here)
OK


2.READ VALUE USING INTELLIGENT TESTER (D SEAT BUCKLE SW)

  1. Connect the intelligent tester to the DLC3.

  1. Turn the ignition switch to ON.

  1. Turn the tester on.

  1. Enter the following menus: Body / Main Body / Data List.

  1. According to the display on the tester, read the Data List.

    Main Body 
    Tester Display
    		Measurement Item/Range
    		Normal Condition
    		Diagnostic Note
    D Seat Buckle SW
    		Buckle switch (Driver side)/ 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.



NG
Go to step 3
OK

USE SIMULATION METHOD TO CHECK (Click here)  

3.INSPECT FRONT SEAT INNER BELT ASSEMBLY (DRIVER SIDE)


    B210251E01

  1. Disconnect the G11 or G7 front seat inner belt assembly (driver side) connector.

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

    Standard Resistance:
    Tester Connection
    		Condition
    		Specified Condition
    1 (E) - 2 (+)
    		Tongue plate fastened
    		10 kΩ or higher
    Tongue plate unfastened
    		Below 1 Ω

    Text in Illustration 
    *1
    		Component without harness connected
    (Front Seat Inner Belt (Driver Side))

  1. Reconnect the front seat inner belt assembly (driver side) connector.



NG
REPLACE FRONT SEAT INNER BELT ASSEMBLY (DRIVER SIDE) (Click here)
OK


4.CHECK HARNESS AND CONNECTOR (FRONT SEAT INNER BELT - INSTRUMENT PANEL JUNCTION BLOCK)


    B210253E01

  1. Disconnect the G11 or G7 front seat inner belt assembly (driver side) connector.

  1. Disconnect the 3E instrument panel junction block connector.

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

    Standard Resistance:
    for LHD 
    Tester Connection
    		Condition
    		Specified Condition
    3E-20 - G11-2 (+)
    		Always
    		Below 1 Ω
    3E-20 or G11-2 (+) - Body ground
    		Always
    		10 kΩ or higher
    for RHD 
    Tester Connection
    		Condition
    		Specified Condition
    3E-20 - G7-2 (+)
    		Always
    		Below 1 Ω
    3E-20 or G7-2 (+) - Body ground
    		Always
    		10 kΩ or higher

    Text in Illustration 
    *1
    		Front view of wire harness connector
    (to Instrument Panel Junction Block)
    *2
    		Front view of wire harness connector
    (to Front Seat Inner Belt (Driver Side))
    *3
    		for LHD
    *4
    		for RHD

  1. Reconnect the front seat inner belt assembly (driver side) connector.

  1. Reconnect the instrument panel junction block connector.



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


5.CHECK HARNESS AND CONNECTOR (FRONT SEAT INNER BELT ASSEMBLY (DRIVER SIDE) - BODY GROUND)


    B214267E02

  1. Disconnect the G11 or G7 front seat inner belt assembly (driver side) connector.

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

    Standard Resistance:
    for LHD 
    Tester Connection
    		Condition
    		Specified Condition
    G11-1 (E) - Body ground
    		Always
    		Below 1 Ω
    for RHD 
    Tester Connection
    		Condition
    		Specified Condition
    G7-1 (E) - Body ground
    		Always
    		Below 1 Ω

    Text in Illustration 
    *1
    		Front view of wire harness connector
    (to Front Seat Inner Belt (Driver Side))
    *2
    		for LHD
    *3
    		for RHD

  1. Reconnect the front seat inner belt assembly (driver side) connector.



NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK


6.REPLACE MAIN BODY ECU

  1. Temporarily replace the main body ECU with a new or normally functioning one (Click here).


NEXT


7.READ VALUE USING INTELLIGENT TESTER

  1. Connect the intelligent tester to the DLC3.

  1. Turn the ignition switch to ON.

  1. Turn the tester on.

  1. Enter the following menus: Body / Main Body / Data List.

  1. According to the display on the tester, read the Data List.

    Main Body 
    Tester Display
    		Measurement Item/Range
    		Normal Condition
    		Diagnostic Note
    D Seat Buckle SW
    		Buckle switch (Driver side)/ 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.



NG
REPLACE INSTRUMENT PANEL JUNCTION BLOCK
OK

END (MAIN BODY ECU IS DEFECTIVE)