Last Modified: 08-22-2025 6.11:8.1.0 Doc ID: RM0000003TPDE3O
Model Year Start: 2026 Model: GR Corolla Prod Date Range: [08/2025 -           ]
Title: SEAT BELT: SEAT BELT WARNING SYSTEM (w/o Occupant Classification System): Front Passenger Side Seat Belt Warning Light does not Operate; 2026 MY Corolla Corolla Hatchback Corolla HV GR Corolla [08/2025 -        ]

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).

WIRING DIAGRAM

CAUTION / NOTICE / HINT

NOTICE:

  • The seat belt warning system uses the CAN communication system and CXPI communication system. First, confirm that there is no malfunction in the CAN communication system and CXPI communication system. Refer to the How to Proceed with Troubleshooting procedure.

    Click here 2026 MY Corolla Corolla Hatchback Corolla HV GR Corolla [08/2025 -        ]; SEAT BELT: SEAT BELT WARNING SYSTEM (w/o Occupant Classification System): HOW TO PROCEED WITH TROUBLESHOOTING

  • 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.
  • When replacing the combination meter assembly, update the ECU security key.

    Click here 2023 - 2026 MY Corolla Corolla Hatchback Corolla HV GR Corolla [09/2022 -        ]; SETUP: WHEN REPLACING OR REMOVING/INSTALLING PARTS: UPDATE ECU SECURITY KEY

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 2026 MY Corolla Corolla Hatchback Corolla HV GR Corolla [08/2025 -        ]; SEAT BELT: SEAT BELT WARNING SYSTEM (w/o Occupant Classification System): ON-VEHICLE INSPECTION

  • 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 2025 - 2026 MY Corolla Corolla Hatchback Corolla HV GR Corolla [09/2024 -        ]; METER / GAUGE / DISPLAY: COMBINATION METER: REMOVAL

PROCEDURE

1.

READ VALUE USING GTS

(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

Front passenger seat belt buckle switch

Set, Unset or Unknown

Set: Front passenger seat belt buckle switch fastened

Unset: Front passenger seat belt buckle switch unfastened

Unknown: Data is not determined

-

Passenger Seat Occupant Sensor Status

Front passenger occupant detection sensor

OFF, ON or Unknown

OFF: Front passenger seat not occupied

ON: Front 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
A

REPLACE POWER DISTRIBUTION BOX ASSEMBLY

C

GO TO STEP 4

B

2.

INSPECT FRONT SEAT INNER BELT ASSEMBLY RH

Click here 2026 MY Corolla Corolla Hatchback Corolla HV GR Corolla [08/2025 -        ]; SEAT BELT: FRONT SEAT INNER BELT ASSEMBLY: INSPECTION

NG

REPLACE FRONT SEAT INNER BELT ASSEMBLY RH

OK

3.

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

(a) Disconnect the 8H 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

O223-3 (+) - 8H-8

Always

Below 1 Ω

O223-3 (+) or 8H-8 - Body ground

Always

10 kΩ or higher

O223-2 (E) - Body ground

Always

Below 1 Ω
OK

REPLACE POWER DISTRIBUTION BOX ASSEMBLY

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR

4.

INSPECT FRONT SEAT INNER BELT ASSEMBLY RH

Click here 2026 MY Corolla Corolla Hatchback Corolla HV GR Corolla [08/2025 -        ]; SEAT BELT: FRONT SEAT INNER BELT ASSEMBLY: INSPECTION

NG

REPLACE FRONT SEAT INNER BELT ASSEMBLY RH

OK

5.

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

Click here 2026 MY Corolla Corolla Hatchback Corolla HV GR Corolla [08/2025 -        ]; SEAT BELT: OCCUPANT DETECTION SENSOR: INSPECTION

NG

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

OK

6.

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

(a) Disconnect the 8H 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

O223-5 (+) - 8H-9

Always

Below 1 Ω

O223-5 (+) or 8H-9 - Body ground

Always

10 kΩ or higher

O223-4 (E) - Body ground

Always

Below 1 Ω
OK

REPLACE POWER DISTRIBUTION BOX ASSEMBLY

NG

REPAIR OR REPLACE HARNESS OR CONNECTOR