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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/ Auto A/C) - Circuit Tests & Symptom Tests >> AIR CONDITIONING SYSTEM (for Gasoline Model with Automatic Air Conditioning System) >> Operation not Accepted Even If Air Conditioning Switch is Operated [11/2023 - ] >> Description

Operation not Accepted Even If Air Conditioning Switch is Operated [11/2023 - ]: Description

If the air conditioning system cannot be operated using the air conditioning control assembly, the following factors may be the cause.

Symptom Factor
Air conditioning system cannot be operated using air conditioning control assembly
  1. (With the exception of the switch indicators, no inputs are reflected when other switches operated)
  • LIN communication malfunction between air conditioning amplifier assembly and air conditioning control assembly
  • Short to +B or ground in air conditioning amplifier assembly circuit
  • Air conditioning amplifier assembly malfunction
  • Air conditioning control assembly malfunction
  • Harness or connector
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