Last Modified: 08-22-2025 6.11:8.1.0 Doc ID: RM0000003TPDE3L
Model Year Start: 2026 Model: GR Corolla Prod Date Range: [08/2025 -           ]
Title: SEAT BELT: SEAT BELT WARNING SYSTEM (w/o Occupant Classification System): HOW TO PROCEED WITH TROUBLESHOOTING; 2026 MY Corolla Corolla Hatchback Corolla HV GR Corolla [08/2025 -        ]

HOW TO PROCEED WITH TROUBLESHOOTING

CAUTION / NOTICE / HINT

HINT:

  • Use the following procedure to troubleshoot the seat belt warning system.
  • *: Use the GTS.

PROCEDURE

1.

VEHICLE BROUGHT TO WORKSHOP
NEXT

2.

CUSTOMER PROBLEM ANALYSIS

(a) Interview the customer to confirm the problem.

Click here 2019 - 2026 MY Corolla Corolla Hatchback Corolla HV GR Corolla [06/2018 -        ]; INTRODUCTION: HOW TO TROUBLESHOOT ECU CONTROLLED SYSTEMS: HOW TO PROCEED WITH TROUBLESHOOTING

NEXT

3.

PRE-CHECK

(a) Measure the auxiliary battery voltage with ignition switch off.

Standard Voltage:

11 to 14 V

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

(b) Check the fuses and relays.

(c) Check the connector connections and terminals to make sure that there are no abnormalities such as loose connections, deformation, etc.

NEXT

4.

CHECK COMMUNICATION FUNCTION OF CAN COMMUNICATION SYSTEM*

(a) Using the GTS, check for CAN communication system DTCs.

Click here 2026 MY Corolla Corolla Hatchback GR Corolla [08/2025 -        ]; NETWORKING: CAN COMMUNICATION SYSTEM (for Gasoline Model): DIAGNOSIS SYSTEM

Result

Proceed to

CAN DTCs are not output

A

CAN DTCs are output

B
B

GO TO CAN COMMUNICATION SYSTEM

A

5.

CHECK COMMUNICATION FUNCTION OF CXPI COMMUNICATION SYSTEM*

(a) Using the GTS, check for CXPI communication system DTCs.

Click here 2023 - 2026 MY Corolla Corolla Hatchback Corolla HV GR Corolla [11/2022 -        ]; NETWORKING: CXPI COMMUNICATION SYSTEM: DIAGNOSTIC TROUBLE CODE CHART

Result

Proceed to

CXPI communication system DTCs are not output

A

CXPI communication system DTCs are output

B
B

GO TO CXPI COMMUNICATION SYSTEM

A

6.

CHECK COMBINATION METER ASSEMBLY

(a) Check the operation of the speedometer, shift indicator and brake warning light on the combination meter assembly.

OK:

The speedometer, shift indicator and brake warning light on the combination meter assembly operate normally.

NG

GO TO METER / GAUGE SYSTEM

OK

7.

PROBLEM SYMPTOMS TABLE

(a) Refer to Problem Symptoms Table.

Click here 2026 MY Corolla Corolla Hatchback Corolla HV GR Corolla [08/2025 -        ]; SEAT BELT: SEAT BELT WARNING SYSTEM (w/o Occupant Classification System): PROBLEM SYMPTOMS TABLE

Result

Proceed to

Fault is not listed in Problem Symptoms Table

A

Fault is listed in Problem Symptoms Table

B
B

GO TO STEP 9

A

8.

OVERALL ANALYSIS AND TROUBLESHOOTING*

(a) Data List / Active Test

Click here 2026 MY Corolla Corolla Hatchback Corolla HV GR Corolla [08/2025 -        ]; SEAT BELT: SEAT BELT WARNING SYSTEM (w/o Occupant Classification System): DATA LIST / ACTIVE TEST

(b) Terminals of ECU

Click here 2026 MY Corolla Corolla Hatchback Corolla HV GR Corolla [08/2025 -        ]; SEAT BELT: SEAT BELT WARNING SYSTEM (w/o Occupant Classification System): TERMINALS OF ECU

(c) On-vehicle Inspection

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

NEXT

9.

REPAIR OR REPLACE
NEXT

10.

CONFIRMATION TEST
NEXT

END