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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) - Diagnostic Codes (1 Of 2) >> AIR CONDITIONING SYSTEM (for Gasoline Model with Automatic Air Conditioning System) >> DTC B1422: Compressor Lock [12/2019 - 10/2022] >> Description

DTC B1422: Compressor Lock [12/2019 - 10/2022]: Description

The ECM sends the engine speed signal to the air conditioning amplifier assembly via CAN communication.

The air conditioning amplifier assembly reads the difference between compressor speed and engine speed. If the difference becomes excessively large, the air conditioning amplifier assembly determines that the compressor is locked, and turns the magnet clutch assembly off.

DTC No. Detection Item DTC Detection Condition Trouble Area Memory
B1422 Compressor Lock Open or short in A/C lock sensor circuit
  • Cooler compressor assembly
  • Harness or connector
  • Air conditioning amplifier assembly
 Memorized
(3 seconds or more)*

*: The air conditioning amplifier assembly stores the DTC if the malfunction has occurred for the period of time indicated in the brackets.

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