Toyota Tacoma (2015-2018) Service Manual: Driver Side Seat Belt Warning Light does not Operate

Toyota Tacoma (2015-2018) Service Manual / Seat Belt / Seat Belt Warning System / Driver Side Seat Belt Warning Light does not Operate

DESCRIPTION

When the ignition switch is ON, the airbag sensor assembly transmits front seat inner belt status signals to the combination meter assembly through 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.

NOTICE:

Recognition code registration is necessary when replacing the main body ECU (multiplex network body ECU).
If the main body ECU (multiplex network body ECU) is replaced, refer to Registration (See page ).*1
- *1: w/ Smart Key System

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

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

PROCEDURE

1.	CHECK DTC OUTPUT (AIRBAG SYSTEM)

(a) Clear the DTCs (See page (b) Check for DTCs (See page ). ).

(b) Check for DTCs (See page Result ).

Result

Result	Proceed to
DTCs are not output	A
DTCs are output	B

GO TO AIRBAG SYSTEM

2.	READ VALUE USING TECHSTREAM (LEFT SIDE BUCKLE SW)

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(d) Enter the following menus: Body Electrical / SRS Airbag / Data List.

(e) Read the Data List according to the display on the Techstream.

SRS Airbag

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

Tester Display

Measurement Item/Range

Normal Condition

Diagnostic Note

Left side Buckle SW

Driver side seat belt buckle switch/Unset, Set or NG

Unset: Driver side seat belt unfastened

Set: Driver side seat belt fastened

NG: Data not determined

Result

Result	Proceed to
Unset or Set is displayed on the Techstream according to the driver seat belt condition	A
Unset or Set is not displayed correctly on the Techstream according to the driver seat belt condition	B
NG is displayed on the Techstream	C

REPLACE FRONT SEAT INNER BELT ASSEMBLY LH

REPLACE AIRBAG SENSOR ASSEMBLY

3.	REPLACE MAIN BODY ECU

(a) Temporarily replace the main body ECU with a new or known good one (See page ).

4.	CHECK SEAT BELT WARNING LIGHT

(a) Check the operation of the seat belt warning light (See page OK: ).

OK:

The seat belt warning light operates normally.

END (MAIN BODY ECU WAS DEFECTIVE)

REPLACE COMBINATION METER ASSEMBLY

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