Toyota Tundra. Manual - part 2523

When the driver side seat belt is not fastened with the ignition switch ON, the driver side seat belt
warning light on the meter comes on to inform the driver. The center airbag sensor detects the
driver side seat belt status and sends signals to the meter ECU using CAN.

b. Front passenger side seat belt warning light:

When the front passenger side seat belt is not fastened with the ignition switch ON and the front
passenger side seat occupied, the front passenger side seat belt warning light on the integration
control and panel blinks. The integration control and panel displays the front passenger side seat
belt status and whether the front passenger side seat is occupied.

c. Seat belt warning buzzer:

When the vehicle is driven at approximately 20 km/h (12 mph) or more while the driver or front
passenger side seat belt is not fastened, the seat belt warning buzzer in the meter ECU sounds at
intervals of 1.2 seconds 5 times.

2. FUNCTION OF MAIN COMPONENT

The following functions are available.

FUNCTION OF MAIN COMPONENT

3. SYSTEM OPERATION

a. Driver side seat belt warning light:

1. When the driver side seat belt is not fastened with the ignition switch ON, check that the

driver side seat belt warning light on the meter comes on to inform the driver.

b. Front passenger side seat belt warning light:

1. When the front passenger side seat belt is not fastened with the ignition switch ON and the

front passenger side seat occupied, check that the front passenger side seat belt warning light

Components

Function

Front seat inner belt LH
(driver side buckle switch)

Informs center airbag sensor of driver side seat belt condition (fastened or
unfastened)

Front seat inner belt RH
(passenger side buckle
switch)

Informs center airbag sensor of front passenger side seat belt condition
(fastened or unfastened)

Occupant detection sensor

Informs center airbag sensor of front passenger side seat condition (occupied
or unoccupied)

Driver side seat belt
warning light

If driver side seat belt is unfastened and ignition switch is ON, meter ECU
flashes seat belt warning light of combination meter as reminder

Front passenger side seat
belt warning light

When front passenger side seat is occupied and ignition switch is ON, if
front passenger side seat belt is unfastened, meter ECU flashes seat belt
warning light of integration control and panel as reminder

Seat belt warning buzzer

If driver or front passenger side seat belt is unfastened and ignition switch is
ON, meter ECU sounds buzzer as reminder

2009 Toyota Tundra

2009 RESTRAINTS Seat Belt - Tundra

on the integration control and panel blinks.

HOW TO PROCEED WITH TROUBLESHOOTING

HINT:



Use the following procedures to troubleshoot the seat belt warning system.



*: Use Techstream.

1. VEHICLE BROUGHT TO WORKSHOP

2. INSPECT BATTERY VOLTAGE

Standard voltage: 11 to 14 V

If the voltage is below 11 V, recharge or replace the battery before proceeding to the next step.

3. CHECK FOR DTC*

a. Check for DTCs and make a note of any codes that are output.

b. Clear the DTCs.

c. Recheck for DTCs. Based on the DTCs output above, try to cause the output of the same CAN

system DTC, airbag system DTC or occupant classification system DTC by simulating the
symptoms indicated by the DTC.

Result:

DTC RESULT CHART

B: Go TO CAN COMMUNICATION (See DIAGNOSTIC TROUBLE CODE TABLE )

C: Go TO AIRBAG SYSTEM (See PRECAUTION )

D: Go TO OCCUPANT CLASSIFICATION SYSTEM (See DIAGNOSTIC TROUBLE CODE
TABLE )

A: Go to next step.

4. PROBLEM SYMPTOMS TABLE

a. Refer to the PROBLEM SYMPTOMS TABLE .

5. OVERALL ANALYSIS AND TROUBLESHOOTING*

Result

Proceed to

DTC output does not reoccur

CAN communication system DTC output reoccurs

Airbag system DTC output reoccurs

Occupant classification system DTC output reoccurs

2009 Toyota Tundra

2009 RESTRAINTS Seat Belt - Tundra

a. See OPERATION CHECK

b. See DATA LIST / ACTIVE TEST

c. See TERMINALS OF ECU

6. REPAIR OR REPLACE

7. CONFIRMATION TEST

NEXT: END

OPERATION CHECK

1. INSPECT DRIVER SIDE SEAT BELT WARNING LIGHT

a. Turn the ignition switch ON.

b. When the driver side seat belt is not fastened, check that the driver side seat belt warning light on

the meter blinks.

c. When the driver side seat belt is fastened, check that the driver side seat belt warning light on the

meter is off.

2. INSPECT FRONT PASSENGER SIDE SEAT BELT WARNING LIGHT

a. Turn the ignition switch ON.

b. When the front passenger side seat belt is not fastened with the front passenger side seat occupied,

check that the front passenger side seat belt warning light on the integration control and panel
blinks.

c. When the front passenger side seat belt is fastened with the front passenger side seat occupied,

check that the front passenger side seat belt warning light on the integration control and panel is
off.

3. INSPECT SEAT BELT WARNING BUZZER

HINT:

If the buzzer does not sound, the buzzer cancel setting may be set to ON (see CUSTOMIZE
PARAMETERS ).

a. Turn the ignition switch ON.

b. When the vehicle is driven at approximately 20 km/h (12 mph) or more while the driver or front

passenger side seat belt is not fastened, check that the buzzer in the meter ECU sounds at intervals
of 1.2 seconds 5 times.

c. Check that the buzzer sounds at intervals of 0.4 seconds for 90 seconds.

d. Check that the buzzer stops 2 minutes after the buzzer starts sounding.

e. After the buzzer has stopped, turn the ignition switch OFF and then start the engine again. Drive

the vehicle at approximately 20 km/h (12 mph) or more while the driver or front passenger side seat
belt is not fastened, and then check that the buzzer sounds again.

f. After the buzzer has stopped, fasten the driver and front passenger side seat belts. Drive the vehicle

at approximately 20 km/h (12 mph) or more, unfasten the driver or front passenger side seat belt,
and then check that the buzzer sounds again.

2009 Toyota Tundra

2009 RESTRAINTS Seat Belt - Tundra

g. After the buzzer has stopped, move the shift lever to the R position, and then move it to the D

position. Drive the vehicle at approximately 20 km/h (12 mph) or more, and then check that the
buzzer sounds again.

PROBLEM SYMPTOMS TABLE

HINT:

Use the table below to help determine the cause of the problem symptom. The potential causes of the symptoms
are listed in order of probability in the "Suspected Area" column of the table. Check each symptom by checking
the suspected areas in the order they are listed. Replace parts as necessary.

Seat belt warning system:

SEAT BELT PROBLEM SYMPTOMS CHART

Symptom

Suspected Area

See

Driver side seat belt warning light
does not operate

CAN communication system