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Home >> Toyota >> 2021 >> Highlander LE, 4WD >> Repair and Diagnosis >> Accessories & Equipment >> Interior/Exterior Trim >> Grille Shutter System - Diagnostics - Introduction >> Grille Shutter System >> System Description [12/2019 - 10/2021] >> System Description [12/2019 - 10/2021]

System Description [12/2019 - 10/2021]

  1. GRILLE SHUTTER SYSTEM 
    1. General description

      The swing grille actuator assembly receives signals from the ECM, hybrid vehicle control ECU and air conditioning amplifier assembly via CAN communication. Based on these signals, the swing grille actuator assembly operates the radiator shutter sub-assembly.

      If a malfunction occurs in the grille shutter system, a warning will be displayed on the multi-information display and grille shutter system operation will be disabled.

    2. Control List
      Control Description
      Closing Operation Control The grille shutter closes when certain conditions related to the vehicle speed, engine coolant temperature, inverter coolant temperature, ambient temperature and refrigerant pressure are met.
      Opening Operation Control The grille shutter opens when certain conditions related to the vehicle speed, engine coolant temperature, inverter coolant temperature, ambient temperature and refrigerant pressure are met.
      Ignition Switch Off-linked Opening Operation Control Opens the grille shutter when the ignition switch is turned off in order to prevent the grille shutter from becoming stuck closed while the vehicle is stopped.
      Winter Control Mode Stops the grille shutter at a position other than the fully closed position and suspends grille shutter operation in order to prevent it from becoming stuck closed when the ambient temperature is 5°C (41°F) or lower. Winter control mode is canceled when the ambient temperature becomes 10°C (50°F) or higher.
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