AIR CONDITIONING SYSTEM(for Automatic Air Conditioning System) Air Conditioning Compressor Magnetic Clutch Circuit

DESCRIPTION

When the air conditioning amplifier assembly is turned on, a magnetic clutch on signal is sent from the MGC terminal of the air conditioning amplifier assembly. Then, the magnetic clutch relay turns on to operate the magnetic clutch.

WIRING DIAGRAM

A01X8Y3E02
A01X8Y3E03

PROCEDURE


  1. CHECK CAN COMMUNICATION SYSTEM


    1. Check for CAN communication system DTCs related to the air conditioning system.

      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. READ VALUE USING INTELLIGENT TESTER (A/C SIGNAL)


    1. Use the Data List to check if the A/C switch is functioning properly.

      Engine
      Tester Display Measurement Item/Range Normal Condition Diagnostic Note
      A/C Signal A/C signal / ON or OFF

      ON: A/C switch on

      OFF: A/C switch off

      		 -
      OK
      The display is as specified in the normal condition.

    OK

    REPLACE ECM Click here

    NG

  3. INSPECT FUSE (A/C IG)


    1. Remove the A/C IG fuse from the cowl side junction block LH.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A/C IG fuse Always Below 1 Ω

    NG

    REPLACE FUSE (A/C IG)

    OK

  4. INSPECT MAGNETIC CLUTCH RELAY


    1. A01X6SAE02

      Remove the magnetic clutch relay from the engine room relay block.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      3 - 5 Voltage not applied to terminals 1 and 2 10 kΩ or higher
      3 - 5 Voltage applied to terminals 1 and 2 Below 1 Ω

    3. Install the magnetic clutch relay to the engine room relay block.


    NG

    REPLACE MAGNETIC CLUTCH RELAY

    OK

  5. CHECK HARNESS AND CONNECTOR (AIR CONDITIONING AMPLIFIER - BATTERY)


    1. A01X9K7E02
      *1 Rear view of wire harness connector: (to Air Conditioning Amplifier Assembly)

      w/ Rear Heater


      1. Disconnect the E36 amplifier connector.

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

        Standard Voltage
        Tester Connection Switch Condition Specified Condition
        E36-18 (MGC) - Body ground Engine switch off Below 1 V
        E36-18 (MGC) - Body ground Engine switch on (IG) 11 to 14 V
    2. A01X4E0E01
      *1 Rear view of wire harness connector: (to Air Conditioning Amplifier Assembly)

      w/o Rear Heater


      1. Disconnect the E81 amplifier connector.

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

        Standard Voltage
        Tester Connection Switch Condition Specified Condition
        E81-20 (MGC) - Body ground Engine switch off Below 1 V
        E81-20 (MGC) - Body ground Engine switch on (IG) 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  6. INSPECT AIR CONDITIONING AMPLIFIER ASSEMBLY


    1. A01X0I4E01
      *1 Component with harness connected: (Air Conditioning Amplifier Assembly)

      w/ Rear Heater


      1. Reconnect the E36 amplifier connector.

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

        Standard Voltage
        Tester Connection Switch Condition Specified Condition
        E36-18 (MGC) - Body ground

        Engine switch on (IG)

        A/C switch off

        		 11 to 14 V
        E36-18 (MGC) - Body ground

        Engine switch on (IG)

        A/C switch on

        		 Below 1 V
    2. A01XBMWE01
      *1 Component with harness connected: (Air Conditioning Amplifier Assembly)

      w/o Rear Heater


      1. Reconnect the E81 amplifier connector.

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

        Standard Voltage
        Tester Connection Switch Condition Specified Condition
        E81-20 (MGC) - Body ground

        Engine switch on (IG)

        A/C switch off

        		 11 to 14 V
        E81-20 (MGC) - Body ground

        Engine switch on (IG)

        A/C switch on

        		 Below 1 V

    NG

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here

    OK

  7. INSPECT COOLER COMPRESSOR ASSEMBLY


    1. A01X9OAE02
      *1 Component with harness connected: (Cooler Compressor Assembly)
      *2 Front view of wire harness connector: (to Magnetic Clutch)

      Disconnect the C30 compressor connector.

    2. Disconnect the A magnetic clutch connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      C30-3 (MG+) - A-1 Always Below 1 Ω
      C30-3 (MG+) - Body ground Always 10 kΩ or higher

    NG

    REPLACE COOLER COMPRESSOR ASSEMBLY Click here

    OK

  8. INSPECT MAGNETIC CLUTCH


    1. A01X99NE02
      *1 Component without harness connected: (Magnetic Clutch)

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      A-1 - Body ground 20°C (68°F) 3.4 to 3.8 Ω

    2. When connector terminal A-1 is connected to the positive (+) battery terminal, check that the following occurs: 1) the operating sound of the magnetic clutch can be heard, and 2) the hub and rotor of the magnetic clutch lock.


    NG

    REPLACE MAGNETIC CLUTCH

    OK

  9. CHECK HARNESS AND CONNECTOR (ENGINE ROOM RELAY BLOCK - BATTERY)


    1. A01X5GUE05
      Engine Room Relay Block
      *1 Magnetic Clutch Relay

      Remove the magnetic clutch relay from the engine room relay block.

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

      Standard Voltage
      Tester Connection Switch Condition Specified Condition
      Relay block magnetic clutch relay terminal 5 - Body ground Engine switch on (IG) 11 to 14 V
      Relay block magnetic clutch relay terminal 1 - Body ground Engine switch on (IG) 11 to 14 V

    OK

    REPAIR OR REPLACE HARNESS OR CONNECTOR (ENGINE ROOM RELAY BLOCK - COOLER COMPRESSOR)

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR (ENGINE ROOM RELAY BLOCK - BATTERY)