Last Modified: 05-13-2024 6.11:8.1.0 Doc ID: RM100000001H8D3
Model Year Start: 2020 Model: Corolla Prod Date Range: [01/2019 - 04/2020]
Title: THEFT DETERRENT / KEYLESS ENTRY: SMART KEY SYSTEM (for Start Function, HV Model): PROBLEM SYMPTOMS TABLE; 2020 MY Corolla Corolla HV [01/2019 - 04/2020]

PROBLEM SYMPTOMS TABLE

HINT:

  • 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 the system before inspecting the suspected areas below.
  • If the problem occurs in certain locations or times of day, the possibility of wave interference is high.
  • If a malfunction occurred after optional components were installed by the dealer, check if there is wave interference from the components.

Smart Key System (for Start Function)

Symptom

Suspected Area

Link

Power source mode does not change to on (IG) or on (ACC)

Smart key system (for Entry Function)

2020 MY Corolla Corolla HV [01/2019 - 04/2020]; THEFT DETERRENT / KEYLESS ENTRY: SMART KEY SYSTEM (for Start Function, HV Model): Power Source Mode does not Change to ON (IG and ACC)

Wireless charging system*

Affected by wave interference

Transmitter battery

Electrical key transmitter sub-assembly

No. 1 indoor electrical key antenna assembly (front floor)

No. 2 indoor electrical key antenna assembly (rear floor)

Power switch

Wire harness or connector

Instrument panel junction block assembly

Certification ECU (Smart key ECU assembly)

Power source mode does not change to on (IG)

Wire harness or connector

2020 - 2022 MY Corolla Corolla HV [01/2019 - 09/2022]; THEFT DETERRENT / KEYLESS ENTRY: SMART KEY SYSTEM (for Start Function, HV Model): Power Source Mode does not Change to ON (IG)

No. 1 Integration Relay

Instrument panel junction block assembly

Certification ECU (Smart key ECU assembly)

Power source mode does not change to on (ACC)

Wire harness or connector

2020 - 2022 MY Corolla Corolla HV [01/2019 - 09/2022]; THEFT DETERRENT / KEYLESS ENTRY: SMART KEY SYSTEM (for Start Function, HV Model): Power Source Mode does not Change to ON (ACC)

Relay

Instrument panel junction block assembly

Certification ECU (Smart key ECU assembly)

Power source mode does not change to ON (READY)

Hybrid control system

2020 MY Corolla Corolla HV [01/2019 - 04/2020]; THEFT DETERRENT / KEYLESS ENTRY: SMART KEY SYSTEM (for Start Function, HV Model): Power Source Mode does not Change to ON (READY)

Immobiliser function

Steering lock function

Wire harness or connector

Shift lock control unit assembly

Stop light switch assembly

Certification ECU (Smart key ECU assembly)

New key cannot be registered

LIN communication system

2020 - 2022 MY Corolla Corolla HV [01/2019 - 09/2022]; THEFT DETERRENT / KEYLESS ENTRY: SMART KEY SYSTEM (for Start Function, HV Model): New Key cannot be Registered

Meter / gauge system

Reregistration

Electrical key transmitter sub-assembly

Steering lock ECU (Steering lock actuator or upper bracket assembly)

ID code box (Immobiliser code ECU)

Certification ECU (Smart key ECU assembly)

Additional key cannot be registered

Smart key system (for Start Function)

2020 - 2022 MY Corolla Corolla HV [01/2019 - 09/2022]; THEFT DETERRENT / KEYLESS ENTRY: SMART KEY SYSTEM (for Start Function, HV Model): Additional Key cannot be Registered

Steering lock function

Electrical key transmitter sub-assembly

ID code box (Immobiliser code ECU)

Certification ECU (Smart key ECU assembly)

New key registration warning message is not displayed

Lighting system (int)

2020 - 2022 MY Corolla Corolla HV [01/2019 - 09/2022]; THEFT DETERRENT / KEYLESS ENTRY: SMART KEY SYSTEM (for Start Function, HV Model): New Key Registration Warning Message is not Displayed

Meter / gauge system

Certification ECU (Smart key ECU assembly)

Unable to unlock steering wheel (hybrid control system cannot start)

Wire harness or connector

2020 - 2022 MY Corolla Corolla HV [01/2019 - 09/2022]; THEFT DETERRENT / KEYLESS ENTRY: SMART KEY SYSTEM (for Start Function, HV Model): Unable to Unlock Steering Wheel (Hybrid Control System cannot Start)

Steering lock ECU (Steering lock actuator or upper bracket assembly)

ID code box (Immobiliser code ECU)

Certification ECU (Smart key ECU assembly)

Steering lock does not lock

Lighting system (int)

2020 - 2022 MY Corolla Corolla HV [01/2019 - 09/2022]; THEFT DETERRENT / KEYLESS ENTRY: SMART KEY SYSTEM (for Start Function, HV Model): Steering Lock does not Lock

Wire harness or connector

Steering lock ECU (Steering lock actuator or upper bracket assembly)

ID code box (Immobiliser code ECU)

Certification ECU (Smart key ECU assembly)

Security indicator light does not blink

Wire harness or connector

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

Security indicator light (Combination meter assembly)

Main body ECU (Multiplex network body ECU)

Certification ECU (Smart key ECU assembly)

Immobiliser system does not operate properly

Communication ID registration was defective

2020 MY Corolla Corolla HV [01/2019 - 04/2020]; THEFT DETERRENT / KEYLESS ENTRY: SMART KEY SYSTEM (for Start Function, HV Model): Immobiliser System does not Operate Properly

Wire harness or connector

ID code box (Immobiliser code ECU)

Hybrid vehicle control ECU

System malfunction message is displayed on the multi-information display

Smart key system (for Entry Function)

2020 - 2022 MY Corolla Corolla HV [01/2019 - 09/2022]; THEFT DETERRENT / KEYLESS ENTRY: SMART KEY SYSTEM (for Start Function, HV Model): System Malfunction Message is Displayed on the Multi-information Display

Smart key system (for Start Function)

Steering lock ECU (Steering lock actuator or upper bracket assembly)

Certification ECU (Smart key ECU assembly)

Electronically controlled brake system
  • *: w/ Wireless Charging System