Toyota Tacoma 2015-2018 Service Manual: Front Passenger Side Seat Belt Warning Light Malfunction

Toyota Tacoma 2015-2018 Service Manual / Seat Belt / Seat Belt Warning System / Front Passenger Side Seat Belt Warning Light Malfunction

DESCRIPTION

The occupant classification ECU detects the state of the front seat inner belt assembly RH and load sensor when the front passenger side seat is occupied with the ignition switch ON. If the front passenger side seat belt is not fastened, the front passenger side seat belt warning light on the combination meter assembly blinks. If the seat belt is fastened, the warning light goes off.

WIRING DIAGRAM

PROCEDURE

1.	CHECK DTC OUTPUT (OCCUPANT CLASSIFICATION 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 OCCUPANT CLASSIFICATION SYSTEM

2.	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

3.	READ VALUE USING TECHSTREAM (PASSENGER BUCKLE SW)

(a) Connect the Techstream to the DLC3.

(b) Turn the ignition switch to ON.

(d) Enter the following menus: Body Electrical / Occupant Detection / Data List.

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

Occupant Detection

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

Tester Display

Measurement Item/Range

Normal Condition

Diagnostic Note

Passenger Buckle SW

Front passenger side seat belt buckle switch/Unset, Set or NG

Unset: Front passenger side seat belt unfastened

Set: Front passenger side seat belt fastened

NG: Data not determined

Result

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

REPLACE FRONT SEAT INNER BELT ASSEMBLY RH

REPLACE OCCUPANT CLASSIFICATION ECU

4.	READ VALUE USING TECHSTREAM (RIGHT 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
Right side Buckle SW	Front passenger side seat belt buckle switch/Unset, Set or NG	Unset: Front passenger side seat belt unfastened Set: Front passenger side seat belt fastened NG: Data not determined	-

Tester Display

Measurement Item/Range

Normal Condition

Diagnostic Note

Right side Buckle SW

Front passenger side seat belt buckle switch/Unset, Set or NG

Unset: Front passenger side seat belt unfastened

Set: Front passenger side seat belt fastened

NG: Data not determined

Result

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

USE SIMULATION METHOD TO CHECK

REPLACE AIRBAG SENSOR ASSEMBLY

On-vehicle Inspection

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