Toyota Tundra Service Manual: Front Passenger Side Seat Belt Warning Light Malfunction

Toyota Tundra Service Manual / Vehicle Interior / Seat Belt / Seat Belt Warning System / Front Passenger Side Seat Belt Warning Light Malfunction

DESCRIPTION

When the ignition switch to ON, the occupant detection ECU sends a signal to the center airbag sensor assembly to indicate the state of the front seat inner belt assembly RH and also whether the front passenger seat is occupied. The center airbag sensor assembly sends those signals to the combination meter assembly via CAN communication. The combination meter assembly illuminates, blinks or turns off the seat belt warning light on the combination meter assembly in accordance with these signals.

HINT:

The seat belt warning light on the combination meter assembly is used for both the driver seat and front passenger seat.

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 DTC (OCCUPANT CLASSIFICATION SYSTEM)

(a) Clear the DTCs (See page ).

(b) Check for DTCs (See page ).

Result

Result	Proceed to
DTC is not output	A
DTC is output	B

GO TO OCCUPANT CLASSIFICATION SYSTEM

2.	CHECK DTC (AIRBAG SYSTEM)

(a) Clear the DTCs (See page ).

(b) Check for DTCs (See page ).

Result

Result	Proceed to
DTC is not output	A
DTC is 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 (See page ).

Occupant Detection (Occupant Detection ECU)

Tester Display

Measurement Item / Range

Normal Condition

Diagnostic Note

Passenger Buckle SW

Front passenger buckle switch / Set, Unset or NG

Set: Seat belt fastened

Unset: Seat belt not fastened

NG: Data is not determined

Result

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

REPLACE FRONT SEAT INNER BELT ASSEMBLY RH

REPLACE OCCUPANT DETECTION ECU

4.	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 / SRS Airbag / Data List.

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

SRS Airbag (Center Airbag Sensor Assembly)

Tester Display

Measurement Item / Range

Normal Condition

Diagnostic Note

Passenger Buckle SW

Passenger buckle switch / Unset, Set or NG

Unset: Seat belt is not fastened

Set: Seat belt is fastened

NG: Data is not determined

Result

Result	Proceed to
Unset or Set is displayed on the Techstream screen according to the front passenger seat belt condition	A
for Column Shift Type Unset or Set is not displayed normally on the Techstream screen according to the front passenger seat belt condition NG is displayed on the Techstream screen	B
for Floor Shift Type Unset or Set is not displayed normally on the Techstream screen according to the front passenger seat belt condition NG is displayed on the Techstream screen	C

REPLACE COMBINATION METER ASSEMBLY

REPLACE CENTER AIRBAG SENSOR ASSEMBLY

Driver Side Seat Belt Warning Light does not Operate

How To Proceed With Troubleshooting

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