Toyota Yaris: Seat Belt Warning System / Front Passenger Side Seat Belt Warning Light does not Operate

Toyota Yaris XP210 (2020-2024) Reapir and Service Manual / Vehicle Interior / Seat Belt / Seat Belt Warning System / Front Passenger Side Seat Belt Warning Light does not Operate

DESCRIPTION

The combination meter assembly blinks or turns off the passenger seat belt warning light on the combination meter assembly in accordance with the state of the front seat inner belt assembly RH and occupant detection sensor (separate type front seat cushion pad RH).

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

  • Before replacing the main body ECU (multiplex network body ECU), refer to Registration.

    Click here

  • When replacing the combination meter assembly, always replace it with a new one. If a combination meter assembly which was installed to another vehicle is used, the information stored in it will not match the information from the vehicle and a DTC may be stored.

HINT:

  • The seat belt warning light on the combination meter assembly is used for both the driver seat and front passenger seat. Check that the operation of the seat belt warning light is normal first.

    Click here

  • If the seat belt warning light does not operate for both the driver seat and front passenger seat, replace the combination meter assembly.

    Click here

PROCEDURE

1.

READ VALUE USING GTS (PASSENGER SEAT BUCKLE SWITCH STATUS / PASSENGER SEAT OCCUPANT SENSOR STATUS)

(a) Read the Data List according to the display on the GTS.

Body Electrical > Power Distribution Box > Data List

Tester Display

Measurement Item

Range

Normal Condition

Diagnostic Note

Passenger Seat Buckle Switch Status

Passenger side seat belt buckle switch status

Set, Unset, Unknown

Set: Passenger seat belt fastened

Unset: Passenger seat belt not fastened

Unknown: Data is not determined

-

Passenger Seat Occupant Sensor Status

Passenger seat occupant detection sensor status

OFF, ON, Unknown

OFF: Passenger seat not occupied

ON: Passenger seat occupied

Unknown: Data is not determined

-

Body Electrical > Power Distribution Box > Data List

Tester Display

Passenger Seat Buckle Switch Status

Passenger Seat Occupant Sensor Status

OK:

The GTS display changes correctly in response to the front passenger seat belt and front passenger seat condition.

Result

Proceed to

OK

A

NG (Passenger Seat Buckle Switch Status)

B

NG (Passenger Seat Occupant Sensor Status)

C

B

GO TO STEP 3

C

GO TO STEP 5

A

2.

PERFORM ACTIVE TEST USING GTS (DRIVER SIDE SEAT BELT WARNING)

(a) Perform the Active Test according to the display on the GTS.

Body Electrical > Combination Meter > Active Test

Tester Display

Measurement Item

Control Range

Diagnostic Note

Driver Side Seat Belt Warning

Front seat belt warning light

ON or OFF

-

OK

REPLACE POWER DISTRIBUTION BOX ASSEMBLY

NG

REPLACE COMBINATION METER ASSEMBLY

3.

INSPECT FRONT SEAT INNER BELT ASSEMBLY RH

Click here

NG

REPLACE FRONT SEAT INNER BELT ASSEMBLY RH

OK

4.

CHECK HARNESS AND CONNECTOR (FRONT SEAT INNER BELT ASSEMBLY RH - POWER DISTRIBUTION BOX ASSEMBLY AND BODY GROUND)

(a) Disconnect the 4E power distribution box assembly connector.

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

O17-3 (+) - 4E-11

Always

Below 1 Ω

O17-3 (+) or 4E-11 - Body ground

Always

10 kΩ or higher

O17-2 (E) - Body ground

Always

Below 1 Ω

OK

REPLACE POWER DISTRIBUTION BOX ASSEMBLY

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

5.

INSPECT FRONT SEAT INNER BELT ASSEMBLY RH

Click here

NG

REPLACE FRONT SEAT INNER BELT ASSEMBLY RH

OK

6.

INSPECT OCCUPANT DETECTION SENSOR (SEPARATE TYPE FRONT SEAT CUSHION PAD RH)

Click here

NG

REPLACE OCCUPANT DETECTION SENSOR (SEPARATE TYPE FRONT SEAT CUSHION PAD RH)

OK

7.

CHECK HARNESS AND CONNECTOR (FRONT SEAT INNER BELT ASSEMBLY RH - POWER DISTRIBUTION BOX ASSEMBLY AND BODY GROUND)

(a) Disconnect the 4E power distribution box assembly connector.

(b) Measure the resistance according to the value(s) in the table below.

Standard Resistance:

Tester Connection

Condition

Specified Condition

O17-5 (+) - 4E-29

Always

Below 1 Ω

O17-5 (+) or 4E-29 - Body ground

Always

10 kΩ or higher

O17-4 (E) - Body ground

Always

Below 1 Ω

OK

REPLACE POWER DISTRIBUTION BOX ASSEMBLY

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

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