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IMMOBILISER SYSTEM DIAGNOSIS SYSTEM

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  1. DESCRIPTION


    1. The certification ECU (smart key ECU assembly) and hybrid vehicle control ECU assembly control the vehicle immobiliser system functions. Immobiliser system data and Diagnostic Trouble Codes (DTCs) can be read through the vehicle Data Link Connector 3 (DLC3).

      In some cases, a malfunction may be occurring in the immobiliser system even though the security indicator light is not illuminated.

      When the system seems to be malfunctioning, use the GTS to check for malfunctions and perform repairs.

  2. CHECK DLC3


    1. Check the DLC3 (Click here).

  3. INSPECT AUXILIARY BATTERY VOLTAGE


    1. Measure the auxiliary battery voltage with the power switch off.

      Standard Voltage
      11 to 14 V

      If the voltage is below 11 V, recharge or replace the auxiliary battery.

  4. START FUNCTION PROBLEM SYMPTOMS

    Symptom Suspected Area Component Malfunction Possible Output DTCs Related Data List Item
    Hybrid control system cannot be started*1 Certification ECU (smart key ECU assembly) Open or short circuit inside ECU

    • B278A

    • B2790

    • Ignition Switch

    • #Codes

    • Immobilizer when IG=ON

    • Immobiliser

    • Master Key

    • Sub Key

    • BCC Malfunction

    • Abnormal Status

    • Different Encrypt Code

    • Different Serial Number

    • Frame Error

    • Response

    • Wireless Starter Com ID

    • Wireless C Code

    • Engine Start Condition

    • ID-BOX Sleep Condition

    • ID-BOX Start Condition

    • Engine Start Request

    • 3bit Code Request

    • S Code Check

    • L Code Check

    • Unlock Request Receive

    • Lock Request Receive

    • S Code Check (Past)

    • L Code Check (Past)

    • EFI Code Receive

    • EFI communication
    Hybrid control system cannot be started*1 ID code box (immobiliser code ECU) Open or short circuit inside ECU

    • B278A

    • B2799-790

    • B279A

    • Ignition Switch

    • #Codes

    • Immobilizer when IG=ON

    • Immobiliser

    • Master Key

    • Sub Key

    • BCC Malfunction

    • Abnormal Status

    • Different Encrypt Code

    • Different Serial Number

    • Frame Error

    • Response

    • Engine Start Condition

    • ID-BOX Sleep Condition

    • ID-BOX Start Condition

    • Engine Start Request

    • 3bit Code Request

    • S Code Check

    • L Code Check

    • Unlock Request Receive

    • Lock Request Receive

    • S Code Check (Past)

    • L Code Check (Past)

    • EFI Code Receive

    • EFI communication
    Hybrid vehicle control ECU assembly Open or short circuit inside ECU

    • B2799-790

    • B279A

    • B279C

    		 EFI Code Receive
    Hybrid control system Hybrid vehicle control ECU assembly incompatible with installed immobiliser system B279C

    • Engine Start Condition

    • EFI Code Receive
    Power source mode cannot be changed*1 Power switch Open or short circuit inside switch B278A

    • Ignition Switch

    • Unlock Request Receive

    • Lock Request Receive
    Certification ECU (Smart key ECU assembly) Open or short circuit inside ECU

    • B2271

    • B2274

    • Ignition Switch

    • Immobilizer when IG=ON

    • Immobiliser
    Steering lock lock/unlock not possible*2 Steering lock ECU (steering lock actuator assembly)

    • Open or short circuit inside ECU

    • Actuator stuck

    • B2781

    • B2782

    • B2788

    • Unlock Request Receive

    • Lock Request Receive

    • *1: Refer to Problem Symptoms Table for Smart Entry and Start System (for Start Function).

    • *2: Refer to Problem Symptoms Table for Steering Lock System.