Last Modified: 05-13-2024 6.11:8.1.0 Doc ID: RM100000001HAPT
Model Year Start: 2020 Model: GR Corolla Prod Date Range: [01/2019 - 09/2022]
Title: THEFT DETERRENT / KEYLESS ENTRY: THEFT DETERRENT SYSTEM (for Gasoline Model): PROBLEM SYMPTOMS TABLE; 2020 - 2022 MY Corolla Corolla Hatchback GR Corolla [01/2019 - 09/2022]

PROBLEM SYMPTOMS TABLE

NOTICE:

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

Click here 2020 MY Corolla Corolla Hatchback GR Corolla [01/2019 - 09/2019]; THEFT DETERRENT / KEYLESS ENTRY: SMART KEY SYSTEM (for Start Function, Gasoline Model): REGISTRATION 2020 MY Corolla Corolla Hatchback GR Corolla [09/2019 - 04/2020]; THEFT DETERRENT / KEYLESS ENTRY: SMART KEY SYSTEM (for Start Function, Gasoline Model): REGISTRATION 2021 - 2022 MY Corolla Corolla Hatchback GR Corolla [04/2020 - 09/2022]; THEFT DETERRENT / KEYLESS ENTRY: SMART KEY SYSTEM (for Start Function, Gasoline Model): REGISTRATION

  • *: w/ Smart Key System

HINT:

  • Troubleshooting of the theft deterrent system is based on the premise that the power door lock control system and the wireless door lock control system are operating normally. Accordingly, before troubleshooting the theft deterrent system, first make certain that the power door lock control system and the wireless door lock control system are operating normally.
  • Use the table below to help determine the cause of problem symptoms. If multiple suspected areas are listed, 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.
  • Inspect the fuses and relays related to this system before inspecting the suspected areas below.

Theft Deterrent System

Symptom

Suspected Area

Link

Theft deterrent system cannot be set

Refer to "Security Indicator Light Does not Blink"

2020 - 2022 MY Corolla Corolla Hatchback GR Corolla [01/2019 - 09/2022]; THEFT DETERRENT / KEYLESS ENTRY: SMART KEY SYSTEM (for Start Function, Gasoline Model): Security Indicator Light Does not Blink

Refer to "Front Door Courtesy Switch Circuit"

2020 - 2022 MY Corolla Corolla Hatchback GR Corolla [01/2019 - 09/2022]; LIGHTING (INT): LIGHTING SYSTEM (for Gasoline Model): Front Door Courtesy Switch Circuit

Refer to "Rear Door Courtesy Switch Circuit"

2020 - 2022 MY Corolla Corolla Hatchback GR Corolla [01/2019 - 09/2022]; LIGHTING (INT): LIGHTING SYSTEM (for Gasoline Model): Rear Door Courtesy Switch Circuit

Refer to "Luggage Compartment Door Courtesy Switch Circuit"*1

2020 - 2022 MY Corolla Corolla Hatchback GR Corolla [01/2019 - 09/2022]; LIGHTING (INT): LIGHTING SYSTEM (for Gasoline Model): Luggage Compartment Door Courtesy Switch Circuit

Refer to "Back Door Courtesy Switch Circuit"*2

2020 - 2022 MY Corolla Corolla Hatchback GR Corolla [01/2019 - 09/2022]; LIGHTING (INT): LIGHTING SYSTEM (for Gasoline Model): Back Door Courtesy Switch Circuit

Front door lock with motor assembly

2020 - 2022 MY Corolla Corolla Hatchback Corolla HV GR Corolla [01/2019 - 09/2022]; DOOR LOCK: FRONT DOOR LOCK: INSPECTION

Rear door lock with motor assembly

2020 - 2022 MY Corolla Corolla Hatchback Corolla HV GR Corolla [01/2019 - 09/2022]; DOOR LOCK: REAR DOOR LOCK: INSPECTION

Luggage Compartment door lock assembly*1

2020 - 2022 MY Corolla Corolla Hatchback Corolla HV GR Corolla [01/2019 - 09/2022]; DOOR LOCK: LUGGAGE COMPARTMENT DOOR LOCK: INSPECTION

Back door lock assembly*2

2019 - 2025 MY Corolla Corolla Hatchback Corolla HV GR Corolla [06/2018 -        ]; DOOR LOCK: BACK DOOR LOCK: INSPECTION

Refer to "Engine Hood Courtesy Switch Circuit"

2020 - 2022 MY Corolla Corolla Hatchback GR Corolla [01/2019 - 09/2022]; THEFT DETERRENT / KEYLESS ENTRY: THEFT DETERRENT SYSTEM (for Gasoline Model): Engine Hood Courtesy Switch Circuit

Security indicator light does not blink when theft deterrent system is set

Refer to "Security Indicator Light Does not Blink"

2020 - 2022 MY Corolla Corolla Hatchback GR Corolla [01/2019 - 09/2022]; THEFT DETERRENT / KEYLESS ENTRY: SMART KEY SYSTEM (for Start Function, Gasoline Model): Security Indicator Light Does not Blink

Alarm sounding state cannot be canceled when engine switch is turned on (IG)*3

Refer to "Smart Key System (for Start Function)"

2020 - 2022 MY Corolla Corolla Hatchback GR Corolla [01/2019 - 09/2022]; THEFT DETERRENT / KEYLESS ENTRY: SMART KEY SYSTEM (for Start Function, Gasoline Model): HOW TO PROCEED WITH TROUBLESHOOTING

Certification ECU (Smart key ECU assembly)

-

If the symptom(s) still occur after the above areas are inspected and proved to be normal, replace the main body ECU (multiplex network body ECU)

2020 MY Corolla Corolla Hatchback Corolla HV GR Corolla [01/2019 - 03/2019]; POWER DISTRIBUTION: MAIN BODY ECU: REMOVAL 2020 - 2022 MY Corolla Corolla Hatchback Corolla HV GR Corolla [03/2019 - 09/2022]; POWER DISTRIBUTION: MAIN BODY ECU: REMOVAL

Alarm sounding state cannot be canceled when ignition switch is turned to ON*4

Refer to "Ignition Switch Circuit"

2020 - 2022 MY Corolla Corolla Hatchback GR Corolla [01/2019 - 09/2022]; THEFT DETERRENT / KEYLESS ENTRY: THEFT DETERRENT SYSTEM (for Gasoline Model): Ignition Switch Circuit

Refer to "Unlock Warning Switch Circuit"

2020 - 2022 MY Corolla Corolla Hatchback GR Corolla [01/2019 - 09/2022]; THEFT DETERRENT / KEYLESS ENTRY: THEFT DETERRENT SYSTEM (for Gasoline Model): Unlock Warning Switch Circuit

If the symptom(s) still occur after the above areas are inspected and proved to be normal, replace the main body ECU (multiplex network body ECU)

2020 MY Corolla Corolla Hatchback Corolla HV GR Corolla [01/2019 - 03/2019]; POWER DISTRIBUTION: MAIN BODY ECU: REMOVAL 2020 - 2022 MY Corolla Corolla Hatchback Corolla HV GR Corolla [03/2019 - 09/2022]; POWER DISTRIBUTION: MAIN BODY ECU: REMOVAL

Theft deterrent system can be set even when door is open

Refer to "Front Door Courtesy Switch Circuit"

2020 - 2022 MY Corolla Corolla Hatchback GR Corolla [01/2019 - 09/2022]; LIGHTING (INT): LIGHTING SYSTEM (for Gasoline Model): Front Door Courtesy Switch Circuit

Refer to "Rear Door Courtesy Switch Circuit"

2020 - 2022 MY Corolla Corolla Hatchback GR Corolla [01/2019 - 09/2022]; LIGHTING (INT): LIGHTING SYSTEM (for Gasoline Model): Rear Door Courtesy Switch Circuit

Refer to "Luggage Compartment Door Courtesy Switch Circuit"*1

2020 - 2022 MY Corolla Corolla Hatchback GR Corolla [01/2019 - 09/2022]; LIGHTING (INT): LIGHTING SYSTEM (for Gasoline Model): Luggage Compartment Door Courtesy Switch Circuit

Refer to "Back Door Courtesy Switch Circuit"*2

2019 - 2025 MY Corolla Corolla Hatchback Corolla HV GR Corolla [06/2018 -        ]; DOOR LOCK: BACK DOOR LOCK: INSPECTION

If the symptom(s) still occur after the above areas are inspected and proved to be normal, replace the main body ECU (multiplex network body ECU)

2020 MY Corolla Corolla Hatchback Corolla HV GR Corolla [01/2019 - 03/2019]; POWER DISTRIBUTION: MAIN BODY ECU: REMOVAL 2020 - 2022 MY Corolla Corolla Hatchback Corolla HV GR Corolla [03/2019 - 09/2022]; POWER DISTRIBUTION: MAIN BODY ECU: REMOVAL

Theft deterrent system can be set even when engine hood is open

Refer to "Engine Hood Courtesy Switch Circuit"

2020 - 2022 MY Corolla Corolla Hatchback GR Corolla [01/2019 - 09/2022]; THEFT DETERRENT / KEYLESS ENTRY: THEFT DETERRENT SYSTEM (for Gasoline Model): Engine Hood Courtesy Switch Circuit

Vehicle horn does not sound while theft deterrent system is in alarm sounding state

Refer to "Horn Circuit"

2020 - 2022 MY Corolla Corolla Hatchback GR Corolla [01/2019 - 09/2022]; THEFT DETERRENT / KEYLESS ENTRY: THEFT DETERRENT SYSTEM (for Gasoline Model): Horn Circuit

Security horn does not sound while theft deterrent system is in alarm sounding state

Refer to "Security Horn Circuit"

2020 - 2022 MY Corolla Corolla Hatchback GR Corolla [01/2019 - 09/2022]; THEFT DETERRENT / KEYLESS ENTRY: THEFT DETERRENT SYSTEM (for Gasoline Model): Security Horn Circuit

Low beams do not blink while theft deterrent system is in alarm sounding state

Refer to "Lighting System"*5

2019 - 2022 MY Corolla Corolla Hatchback GR Corolla [06/2018 - 09/2022]; LIGHTING (EXT): LIGHTING SYSTEM (for Gasoline Model with AFS): HOW TO PROCEED WITH TROUBLESHOOTING

Refer to "Lighting System"*6

2020 - 2022 MY Corolla Corolla Hatchback GR Corolla [01/2019 - 09/2022]; LIGHTING (EXT): LIGHTING SYSTEM (for Gasoline Model without AFS): HOW TO PROCEED WITH TROUBLESHOOTING

If the symptom(s) still occur after the above area is inspected and proved to be normal, replace the main body ECU (multiplex network body ECU)

2020 MY Corolla Corolla Hatchback Corolla HV GR Corolla [01/2019 - 03/2019]; POWER DISTRIBUTION: MAIN BODY ECU: REMOVAL 2020 - 2022 MY Corolla Corolla Hatchback Corolla HV GR Corolla [03/2019 - 09/2022]; POWER DISTRIBUTION: MAIN BODY ECU: REMOVAL

Taillights do not blink while theft deterrent system is in alarm sounding state

Refer to "Taillight Relay Circuit"*5

2020 - 2022 MY Corolla Corolla Hatchback GR Corolla [01/2019 - 09/2022]; LIGHTING (EXT): LIGHTING SYSTEM (for Gasoline Model with AFS): Taillight Relay Circuit

Refer to "Taillight Relay Circuit"*6

2020 - 2022 MY Corolla Corolla Hatchback GR Corolla [01/2019 - 09/2022]; LIGHTING (EXT): LIGHTING SYSTEM (for Gasoline Model without AFS): Taillight Relay Circuit

If the symptom(s) still occur after the above area is inspected and proved to be normal, replace the main body ECU (multiplex network body ECU)

2020 MY Corolla Corolla Hatchback Corolla HV GR Corolla [01/2019 - 03/2019]; POWER DISTRIBUTION: MAIN BODY ECU: REMOVAL 2020 - 2022 MY Corolla Corolla Hatchback Corolla HV GR Corolla [03/2019 - 09/2022]; POWER DISTRIBUTION: MAIN BODY ECU: REMOVAL

Hazard warning lights do not flash while theft deterrent system is in alarm sounding state

Combination meter assembly

-

If the symptom(s) still occur after the above area is inspected and proved to be normal, replace the main body ECU (multiplex network body ECU)

2020 MY Corolla Corolla Hatchback Corolla HV GR Corolla [01/2019 - 03/2019]; POWER DISTRIBUTION: MAIN BODY ECU: REMOVAL 2020 - 2022 MY Corolla Corolla Hatchback Corolla HV GR Corolla [03/2019 - 09/2022]; POWER DISTRIBUTION: MAIN BODY ECU: REMOVAL

Interior lights does not light up while theft deterrent system is in alarm sounding state

Refer to "Interior Light Circuit"

2020 - 2022 MY Corolla Corolla Hatchback GR Corolla [01/2019 - 09/2022]; LIGHTING (INT): LIGHTING SYSTEM (for Gasoline Model): Interior Light Circuit

If the symptom(s) still occur after the above area is inspected and proved to be normal, replace the main body ECU (multiplex network body ECU)

2020 MY Corolla Corolla Hatchback Corolla HV GR Corolla [01/2019 - 03/2019]; POWER DISTRIBUTION: MAIN BODY ECU: REMOVAL 2020 - 2022 MY Corolla Corolla Hatchback Corolla HV GR Corolla [03/2019 - 09/2022]; POWER DISTRIBUTION: MAIN BODY ECU: REMOVAL

Low beams blink even when theft deterrent system is not set

Refer to "Lighting System"*5

2019 - 2022 MY Corolla Corolla Hatchback GR Corolla [06/2018 - 09/2022]; LIGHTING (EXT): LIGHTING SYSTEM (for Gasoline Model with AFS): HOW TO PROCEED WITH TROUBLESHOOTING

Refer to "Lighting System"*6

2020 - 2022 MY Corolla Corolla Hatchback GR Corolla [01/2019 - 09/2022]; LIGHTING (EXT): LIGHTING SYSTEM (for Gasoline Model without AFS): HOW TO PROCEED WITH TROUBLESHOOTING

If the symptom(s) still occur after the above area is inspected and proved to be normal, replace the main body ECU (multiplex network body ECU)

2020 MY Corolla Corolla Hatchback Corolla HV GR Corolla [01/2019 - 03/2019]; POWER DISTRIBUTION: MAIN BODY ECU: REMOVAL 2020 - 2022 MY Corolla Corolla Hatchback Corolla HV GR Corolla [03/2019 - 09/2022]; POWER DISTRIBUTION: MAIN BODY ECU: REMOVAL

Taillights blink even when theft deterrent system is not set

Refer to "Taillight Relay Circuit"*5

2020 - 2022 MY Corolla Corolla Hatchback GR Corolla [01/2019 - 09/2022]; LIGHTING (EXT): LIGHTING SYSTEM (for Gasoline Model with AFS): Taillight Relay Circuit

Refer to "Taillight Relay Circuit"*6

2020 - 2022 MY Corolla Corolla Hatchback GR Corolla [01/2019 - 09/2022]; LIGHTING (EXT): LIGHTING SYSTEM (for Gasoline Model without AFS): Taillight Relay Circuit

If the symptom(s) still occur after the above area is inspected and proved to be normal, replace the main body ECU (multiplex network body ECU)

2020 MY Corolla Corolla Hatchback Corolla HV GR Corolla [01/2019 - 03/2019]; POWER DISTRIBUTION: MAIN BODY ECU: REMOVAL 2020 - 2022 MY Corolla Corolla Hatchback Corolla HV GR Corolla [03/2019 - 09/2022]; POWER DISTRIBUTION: MAIN BODY ECU: REMOVAL

Hazard warning lights flash even when theft deterrent system is not set

Combination meter assembly

-

If the symptom(s) still occur after the above area is inspected and proved to be normal, replace the main body ECU (multiplex network body ECU)

2020 MY Corolla Corolla Hatchback Corolla HV GR Corolla [01/2019 - 03/2019]; POWER DISTRIBUTION: MAIN BODY ECU: REMOVAL 2020 - 2022 MY Corolla Corolla Hatchback Corolla HV GR Corolla [03/2019 - 09/2022]; POWER DISTRIBUTION: MAIN BODY ECU: REMOVAL

Interiors light comes on even when theft deterrent system is not set

Refer to "Interior Light Circuit"

2020 - 2022 MY Corolla Corolla Hatchback GR Corolla [01/2019 - 09/2022]; LIGHTING (INT): LIGHTING SYSTEM (for Gasoline Model): Interior Light Circuit

If the symptom(s) still occur after the above area is inspected and proved to be normal, replace the main body ECU (multiplex network body ECU)

2020 MY Corolla Corolla Hatchback Corolla HV GR Corolla [01/2019 - 03/2019]; POWER DISTRIBUTION: MAIN BODY ECU: REMOVAL 2020 - 2022 MY Corolla Corolla Hatchback Corolla HV GR Corolla [03/2019 - 09/2022]; POWER DISTRIBUTION: MAIN BODY ECU: REMOVAL

The vehicle does not enter the alarm sounding state as the battery is reconnected

Check the battery*7

2019 - 2022 MY Corolla Corolla Hatchback [06/2018 - 09/2022]; M20A-FKS (BATTERY / CHARGING): CHARGING SYSTEM: ON-VEHICLE INSPECTION

Check the battery*8

2020 - 2022 MY Corolla [01/2019 - 09/2022]; 2ZR-FAE (BATTERY / CHARGING): CHARGING SYSTEM: ON-VEHICLE INSPECTION

Refer to "Power Source Circuit"

2020 - 2022 MY Corolla Corolla Hatchback GR Corolla [01/2019 - 09/2022]; THEFT DETERRENT / KEYLESS ENTRY: THEFT DETERRENT SYSTEM (for Gasoline Model): Power Source Circuit

  • *1: for Sedan
  • *2: for Hatchback
  • *3: w/ Smart Key System
  • *4: w/o Smart Key System
  • *5: w/ AFS
  • *6: w/o AFS
  • *7: for M20A-FKS
  • *8: for 2ZR-FAE