DTC B1422/22 Compressor Lock Sensor Circuit: Description

WARNING: This page is about a different car, the 2008 Lexus RX 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 through the multiplex communication (CAN and BEAN). 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.

DTC DESCRIPTION REFERENCE

DTC No.	DTC Detection Condition	Trouble Area
B1422/22	Open or short in compressor lock sensor circuit. Both conditions below are detected for 3 sec. or more: Engine speed: 450 RPM or more Ratio between engine and compressor speed deviates 20% or more in comparison with normal operation	Compressor and magnetic clutch (A/C lock sensor) Compressor drive belt Harness or connector between compressor and magnetic clutch (A/C lock sensor) and A/C amplifier Multiplex communication circuit CAN communication circuit A/C amplifier