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Home >> Toyota >> 2021 >> Highlander LE, 4WD >> Repair and Diagnosis >> Heating, Ventilation & A/C (HVAC) >> HVAC Control Systems >> Heating / Air Conditioning System (Except HV, W/ Manual A/C) - Diagnostic Codes, Circuit Tests & Symptom Tests >> AIR CONDITIONING SYSTEM (for Gasoline Model with Manual Air Conditioning System) >> Ambient Temperature Display System [12/2019 - 10/2022] >> Caution / Notice / Hint

Caution / Notice / Hint

NOTE:
  • After turning the ignition switch off, waiting time may be required before disconnecting the cable from the negative (-) battery terminal. Therefore, make sure to read the disconnecting the cable from the negative (-) battery terminal notices before proceeding with work.

    Refer to INITIALIZATION [12/2019 - 09/2020] , or refer to INITIALIZATION [09/2020 - 10/2021] , or refer to INITIALIZATION [10/2021 - 10/2022]

  • Before starting the inspection, it is necessary to release the residual heat from the engine room (engine unit and coolant hoses, etc.) after stopping the engine and electric motor (when the vehicle is parked after being driven). Therefore, move and park the vehicle in the following type of temperature measurement location.
    • A location within the vehicle service area which has a relatively low amount of environmental temperature changes in the area surrounding the vehicle.
    • A location with a level surface made of a material such as concrete which transmits a relatively low amount of heat from the ground, such as concrete.
    • A location with no heat influences around the vehicle to be inspected such as other vehicles with a running engine and electric motors, exhaust gas ducts installed on the exhaust pipes, stoves, etc.
  • When the damper servo motor or air conditioning amplifier assembly is replaced, be sure to perform servo motor initialization.

    Refer to INITIALIZATION [12/2019 - 10/2022]

  • The air conditioning system uses the CAN communication system. Inspect the communication functions by following How to Proceed with Troubleshooting. Troubleshoot the air conditioning system after confirming that the communication systems are functioning properly.

    Refer to HOW TO PROCEED WITH TROUBLESHOOTING [12/2019 - 10/2022]

  • Ignition switch operation during parked vehicle inspection:

    Turn the ignition switch to ON. (Do not start the engine and electric motor.)

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