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Home >> Lexus >> 2008 >> ES 350 >> Repair and Diagnosis >> External Pages >> Different car >> Section 83 (Air Conditioning) >> Air Conditioning System >> DTC B1422/22 Compressor Lock Sensor Circuit >> System Description

System Description

WARNING: This page is about a different car, the 2007 Lexus ES 350. However, it is still accessible from the selected car via links, so may be relevant.

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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