AIR CONDITIONING SYSTEM(for Automatic Air Conditioning System) Rear Magnetic Valve Circuit

DESCRIPTION

The rear cooling unit expansion valve (rear magnetic valve) is controlled by the air conditioning amplifier assembly.

WIRING DIAGRAM

A01X155E15

PROCEDURE


  1. PERFORM ACTIVE TEST USING INTELLIGENT TESTER (REAR A/C MAG VALVE)


    1. Select the Active Test, use the intelligent tester to generate a control command, and then check that the rear cooling unit expansion valve operates.

      OK
      Rear cooling unit expansion valve operates normally.
      Air Conditioner
      Tester Display Test Part Control Range Diagnostic Note
      Rear A/C Mag Valv Rear cooling unit expansion valve OFF or ON -

    OK

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here

    NG

  2. 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

    OK

  3. CHECK HARNESS AND CONNECTOR (WIRING AIR CONDITIONING HARNESS - BATTERY)


    1. A01X6PFE03
      *1 Front view of wire harness connector: (to Air Conditioning Wiring Harness Sub-assembly)

      Disconnect the wiring air conditioning harness sub-assembly connector.

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

      Standard Voltage
      Tester Connection Condition Specified Condition
      2 (+S) - Body ground Engine switch off Below 1 V
      Engine switch on (IG) 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. CHECK HARNESS AND CONNECTOR (WIRING AIR CONDITIONING HARNESS - AIR CONDITIONING AMPLIFIER)

    A01X5F2E01
    *1 Front view of wire harness connector: (to Air Conditioning Wiring Harness Sub-assembly)
    *2 Rear view of wire harness connector: (to Air Conditioning Amplifier Assembly)

    1. Disconnect the wiring air conditioning harness sub-assembly connector.

    2. Disconnect the E36 amplifier connector.

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

      Standard Resistance
      Tester Connection Condition Specified Condition
      3 (RMGV) - E36-19 (RMGV) Always Below 1 Ω
      3 (RMGV) - Body ground Always 10 kΩ or higher
      E36-19 (RMGV) - Body ground

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  5. CHECK REAR COOLING UNIT EXPANSION VALVE (OPERATION)


    1. Replace the rear cooling unit expansion valve Click here.

      Tech Tips

      Since the rear cooling unit expansion valve cannot be inspected while it is removed from the vehicle, replace the rear cooling unit expansion valve with a normal one and check that the condition returns to normal.

      OK
      Same problem does not occur.

    OK

    REPLACE REAR COOLING UNIT EXPANSION VALVE Click here

    NG

  6. CHECK WIRING AIR CONDITIONING HARNESS SUB-ASSEMBLY (OPERATION)


    1. Replace the wiring air conditioning harness sub-assembly with a normal one and check that the condition returns to normal.

      OK
      Same problem does not occur.

    OK

    REPLACE WIRING AIR CONDITIONING HARNESS SUB-ASSEMBLY

    NG

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here