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Home >> Toyota >> 2012 >> Highlander Limited, FWD >> Repair and Diagnosis >> Heating, Ventilation & A/C (HVAC) >> HVAC Control Systems >> Air Conditioning (Automatic) (Diagnostic Codes & Circuit Tests) (Except Hybrid) >> AIR CONDITIONING SYSTEM (for Automatic Air Conditioning System) >> DTC B1422/22: Compressor Lock Sensor Circuit >> System Description

System Description

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

The air conditioning amplifier reads the difference between compressor speed and engine speed. When the difference becomes too large, the air conditioning amplifier determines that the compressor is locked, and turns the magnetic clutch off.

DTC No. DTC Detection Condition Trouble Area
B1422/22 Open or short in compressor lock sensor circuit
  • Air conditioning compressor (Air conditioning lock sensor)
  • Compressor drive belt
  • Harness or connector between compressor and air conditioning amplifier
  • Air conditioning amplifier
  • CAN communication system
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