AIR CONDITIONING SYSTEM(for Automatic Air Conditioning System), Diagnostic DTC:B1422/22

DTC Code DTC Name
B1422/22 Compressor Lock Sensor Circuit

SYSTEM 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. When the difference becomes too large, the air conditioning amplifier assembly determines that the compressor is locked, and turns the magnetic clutch off.

DTC Code DTC Detection Condition Trouble Area
B1422/22 An open or short in the compressor lock sensor circuit.

  • Cooler compressor assembly (A/C lock sensor)

  • Compressor drive belt

  • Harness or connector between cooler compressor assembly and air conditioning amplifier assembly

  • Air conditioning amplifier assembly

  • CAN communication line

WIRING DIAGRAM

B001YIXE01
w/ Rear Heater
*a LOCK
*b Cooler Compressor Assembly (A/C Lock Sensor)
*c Air Conditioning Amplifier Assembly
*d CAN Communication Line
B001YIXE02
w/o Rear Heater
*a LOCK
*b Cooler Compressor Assembly (A/C Lock Sensor)
*c CAN Communication Line
*d Air Conditioning Amplifier Assembly

PROCEDURE


  1. CHECK CAN COMMUNICATION SYSTEM


    1. Use the intelligent tester to check if the CAN communication system is functioning normally.

      Result
      Result Proceed to
      CAN DTC is not output A
      CAN DTC is output (for LHD) B
      CAN DTC is output (for RHD) C

    B

    GO TO CAN COMMUNICATION SYSTEM Click here

    C

    GO TO CAN COMMUNICATION SYSTEM Click here

    A

  2. INSPECT AIR CONDITIONING AMPLIFIER ASSEMBLY


    1. B001YO8E02
      *a Component with harness connected: (Air Conditioning Amplifier Assembly)
      *b LOCK

      w/ Rear Heater


      1. Remove the air conditioning amplifier assembly with its connectors still connected Click here.

      2. Measure the waveform of the connector.

        B001WNQE05
        Measurement Condition
        Item Contents
        Terminal No. (Symbol) E35-28 (LOCK) - E35-29 (SG-5)
        Tool Setting 200 mV/DIV., 10 ms/DIV.
        Condition

        Engine running

        A/C switch on

        Blower switch LO
    2. B001ZG4E02
      *a Component with harness connected: (Air Conditioning Amplifier Assembly)
      *b LOCK

      w/o Rear Heater


      1. Remove the air conditioning amplifier assembly with its connectors still connected Click here.

      2. Measure the waveform of the connector.

        B001WNQE05
        Measurement Condition
        Item Contents
        Terminal No. (Symbol) E81-8 (LOCK) - E81-35 (SG-5)
        Tool Setting 200 mV/DIV., 10 ms/DIV.
        Condition

        Engine running

        A/C switch on

        Blower switch LO

    OK

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here

    NG

  3. INSPECT COOLER COMPRESSOR ASSEMBLY (A/C LOCK SENSOR)


    1. B00203IE01
      *1 Component without harness connected: (A/C Lock Sensor)

      Disconnect the C30 connector.

    2. Measure the resistance according to the value(s) in the table below.

      Standard Resistance
      Tester Connection Condition Specified Condition
      C30-1 (SSR+) - C30-2 (SSR-) 20°C (68°F) 65 to 125 Ω

    NG

    REPLACE COOLER COMPRESSOR ASSEMBLY (A/C LOCK SENSOR)

    OK

  4. CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER - A/C LOCK SENSOR)


    1. w/ Rear Heater

      B001WV9E01
      *a Front view of wire harness connector: (to Cooler Compressor Assembly)
      *b Rear view of wire harness connector: (to Air Conditioning Amplifier Assembly)
      *c LOCK

      1. Disconnect the E35 amplifier connector.

      2. Disconnect the C30 compressor connector.

      3. Measure the resistance according to the value(s) in the table below.

        Standard Resistance
        Tester Connection Condition Specified Condition
        E35-28 (LOCK) - C30-1 (SSR+) Always Below 1 Ω
        E35-29 (SG-5) - C30-2 (SSR-) Always Below 1 Ω
        E35-28 (LOCK) - Body ground Always 10 kΩ or higher
        E35-29 (SG-5) - Body ground Always 10 kΩ or higher

    2. w/o Rear Heater

      B001YRQE01
      *a Front view of wire harness connector: (to Cooler Compressor Assembly)
      *b Rear view of wire harness connector: (to Air Conditioning Amplifier Assembly)

      1. Disconnect the E81 amplifier connector.

      2. Disconnect the C30 compressor connector.

      3. Measure the resistance according to the value(s) in the table below.

        Standard Resistance
        Tester Connection Condition Specified Condition
        E81-8 (LOCK) - C30-1 (SSR+) Always Below 1 Ω
        E81-35 (SG-5) - C30-2 (SSR-) Always Below 1 Ω
        E81-8 (LOCK) - Body ground Always 10 kΩ or higher
        E81-35 (SG-5) - Body ground Always 10 kΩ or higher

    OK

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR