Toyota Yaris: Smart Key System (for Start Function) / Problem Symptoms Table

Toyota Yaris XP210 (2020-2024) Reapir and Service Manual / Vehicle Interior / Theft Deterrent / Keyless Entry / Smart Key System (for Start Function) / Problem Symptoms Table

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)

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)

Engine switch

Wire harness or connector

Power distribution box assembly

Certification ECU (Smart key ECU assembly)

Power source mode does not change to on (IG)

Wire harness or connector

Relay

- IGR NO. 1 relay

- IGR NO. 2 relay

- IGP relay

Power distribution box assembly

Certification ECU (Smart key ECU assembly)

Power source mode does not change to on (ACC)

Wire harness or connector

Relay

- ACC relay

Power distribution box assembly

Certification ECU (Smart key ECU assembly)

Engine does not start

Transmitter battery

Affected by wave interference

SFI system

Steering lock function

Immobiliser function

Wire harness or connector

ST NO. 1 fuse

ST relay

Clutch switch assembly

Electrical key transmitter sub-assembly

Stop light switch assembly

Certification ECU (Smart key ECU assembly)

New key cannot be registered

LIN communication system

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

Steering lock function

Reregistration

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)

Meter / gauge system

Certification ECU (Smart key ECU assembly)

Unable to unlock steering wheel (Engine cannot start)

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)

Steering lock does not lock

Lighting system (int)

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

Security indicator light (Combination meter assembly)

Certification ECU (Smart key ECU assembly)

Immobiliser system does not operate properly

Communication ID registration was defective

Wire harness or connector

ID code box (Immobiliser code ECU)

ECM

System malfunction message is displayed on the multi-information display

Smart key system (for Entry Function)

Smart key system (for Start Function)

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

Certification ECU (Smart key ECU assembly)

Clutch start switch assembly

Electronically controlled brake system

    Customize Parameters

    CUSTOMIZE PARAMETERS CUSTOMIZE SMART KEY SYSTEM (for Start Function) NOTICE: When the customer requests a change in a function, first make sure that the function can be customized...

    Terminals Of Ecu

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    Categories

    Turning the Engine Off

    Stop the vehicle completely. Manual transaxle: Shift into neutral and set the parking brake.

    Automatic transaxle: Shift the selector lever to the P position and set the parking brake.

    Press the push button start to turn off the engine. The ignition position is off.

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