IMMOBILISER SYSTEM DIAGNOSIS SYSTEM


  1. DESCRIPTION


    1. The certification ECU (smart key ECU assembly) and hybrid vehicle control ECU 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.

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

    2. START FUNCTION PROBLEM SYMPTOMS

    3. 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

      • B279986

      • B279A12


      • # 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
      • B2790

      • B279986

      • B279A12


      • Immobilizer when IG=ON

      • Immobiliser

      • Master Key

      • Sub Key

      • BCC Malfunction

      • Abnormal Status

      • Different Encrypt Code

      • Different Serial Number

      • Frame Error

      • Response

      • ID-BOX Sleep Condition

      • ID-BOX Start Condition

      • Engine Start Request

      • 3bit Code Request

      • S Code Check

      • L Code Check

      • S Code Check (Past)

      • L Code Check (Past)

      • EFI Code Receive

      • EFI Communication

      Hybrid vehicle control ECU Open or short circuit inside ECU
      • B279986

      • B279A12

      • B279C95

      EFI Code Receive
      Hybrid control Hybrid vehicle control ECU incompatible with installed immobiliser system B279C95
      • Engine Start Condition

      • EFI Code Receive

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

      • Lock Request Receive

      Certification ECU (smart key ECU assembly) Open or short circuit inside ECU
      • B2271

      • B2274


      • Immobilizer when IG=ON

      • Immobiliser

      Gearshift control lock/unlock not possible*2 Hybrid vehicle control ECU
      • Open or short circuit inside ECU

      • Actuator stuck


      • B2781

      • B2782

      • B2788


      • Unlock Request Receive

      • Lock Request Receive