DSD Information System
Home >> Toyota >> 2021 >> Highlander LE, 4WD >> Repair and Diagnosis >> Body & Frame >> Door Locks >> Smart Key System (For Start, Except HV) - Diagnostic Codes (2 Of 2) & Symptom Tests (1 Of 2) >> SMART KEY SYSTEM (for Start Function, Gasoline Model) >> DTC B279A-12: Engine Immobilizer System Circuit Short to Battery [12/2019 - 10/2021] >> Caution / Notice / Hint

Caution / Notice / Hint

NOTE:
  • When using the GTS with the ignition switch off, connect the GTS to the DLC3 and turn a courtesy light switch on and off at intervals of 1.5 seconds or less until communication between the GTS and the vehicle begins. Then select the vehicle type under manual mode and enter the following menus: Body Electrical / Smart Key. While using the GTS, periodically turn a courtesy light switch on and off at intervals of 1.5 seconds or less to maintain communication between the GTS and the vehicle.
  • The smart key system (for Start Function) uses the LIN communication system and CAN communication system. Inspect the communication function by following How to Proceed with Troubleshooting. Troubleshoot the smart key system (for Start Function) after confirming that the communication systems are functioning properly.

    Refer to HOW TO PROCEED WITH TROUBLESHOOTING [12/2019 - 10/2021]

  • Before replacing the ECM or certification ECU (smart key ECU assembly), refer to Registration.

    Refer to REGISTRATION [12/2019 - 10/2021]

  • After performing repairs, confirm that no DTCs are output by performing "DTC Output Confirmation Operation".

HINT: 

When DTC B279A-12 and a certification ECU (smart key ECU assembly) DTC are output simultaneously, first perform troubleshooting for the certification ECU (smart key ECU assembly) DTC.

Diesel-Data.com