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Home › Lexus › 2007 › ES 350 › Repair and Diagnosis › Heating, Ventilation & A/C (HVAC) › HVAC Control Systems › Air Conditioning › Air Conditioning System › DTC B1422/22 Compressor Lock Sensor Circuit › System Description

System Description

The ECM sends an engine speed signal to the A/C amplifier via CAN communication.

The A/C amplifier reads the difference between compressor speed and engine speed. When the difference becomes too large, the A/C amplifier determines that the compressor locks, and turns the magnetic clutch off.

DIAGNOSTIC TROUBLE CODE CHART

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