Toyota 4Runner manuals

Toyota 4Runner: Driver Side Seat Belt Warning Light does not Operate

Toyota 4Runner Service Manual / Vehicle Interior / Seat Belt / Seat Belt Warning System / Driver Side Seat Belt Warning Light does not Operate

DESCRIPTION

When the ignition switch is turned to ON, the center airbag sensor transmits front seat inner belt LH state signals to the combination meter through the CAN. If the driver side seat belt is not fastened, the combination meter blinks the driver side seat belt warning light. If the seat belt is fastened, the warning light goes off.

WIRING DIAGRAM


CAUTION / NOTICE / HINT

NOTICE:

The seat belt warning system uses the CAN communication system. First, confirm that there is no malfunction in the CAN communication system. Refer to the How to Proceed with Troubleshooting procedure (See page
).

PROCEDURE

1.

CHECK FOR DTC (AIRBAG SYSTEM)

(a) Clear the DTCs (See page ).


(b) Check for DTCs (See page ).


Result

Result

Proceed to

DTC is not output

A

Airbag system DTC is output

B


B

GO TO AIRBAG SYSTEM


A

2.

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

(a) Operate the Techstream according to the display and select Active Test (See page ).


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.


NG

REPLACE COMBINATION METER ASSEMBLY


OK

3.

REPLACE CENTER AIRBAG SENSOR ASSEMBLY

(a) Temporarily replace the center airbag sensor with a new one (See page ).



NEXT

4.

CHECK DRIVER SIDE SEAT BELT WARNING LIGHT

(a) Check the driver side seat belt warning light function (See page ).


OK:

Driver side seat belt warning light operates normally.


OK

END (CENTER AIRBAG SENSOR IS DEFECTIVE)


NG

REPLACE COMBINATION METER ASSEMBLY

Data List / Active Test
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DESCRIPTION When the ignition switch is ON, the occupant detection ECU sends a signal to the airbag sensor assembly to indicate the state of the front seat inner belt assembly RH and also whether ...

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