AIR CONDITIONING SYSTEM Rear Magnetic Valve Circuit

DESCRIPTION

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

WIRING DIAGRAM

B0018ASE03

CAUTION / NOTICE / HINT

Note

Inspect the fuses for circuits related to this system before performing the following inspection procedure.

PROCEDURE


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


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

      Air Conditioner
      Tester Display Test Part Control Range Diagnostic Note
      Rear A/C Mag Valve Rear A/C magnetic valve ON or OFF -
      OK
      Rear magnetic valve operates normally using GTS.

    OK

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here

    NG

  2. CHECK HARNESS AND CONNECTOR (WIRING AIR CONDITIONING HARNESS SUB-ASSEMBLY - BATTERY)


    1. B001B46
      Text in Illustration
      *a

      Front view of wire harness connector

      (to Wiring Air Conditioning 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 Switch Condition Specified Condition
      2 - Body ground Engine switch off Below 1 V
      2 - Body ground Engine switch on (IG) 11 to 14 V

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  3. CHECK HARNESS AND CONNECTOR (WIRING AIR CONDITIONING HARNESS SUB-ASSEMBLY - AIR CONDITIONING AMPLIFIER ASSEMBLY)


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

    2. Disconnect the E36 air conditioning amplifier assembly connector.

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

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

    NG

    REPAIR OR REPLACE HARNESS OR CONNECTOR

    OK

  4. CHECK REAR COOLING UNIT EXPANSION VALVE


    1. Replace the rear cooling unit expansion valve with a new or known good one and check that the condition returns to normal. 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 new or known good one and check that the condition returns to normal.

      OK
      Same problem does not occur.

    OK

    END (REAR COOLING UNIT EXPANSION VALVE WAS DEFECTIVE)

    NG

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


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

      OK
      Same problem does not occur.

    OK

    END (WIRING AIR CONDITIONING HARNESS SUB-ASSEMBLY WAS DEFECTIVE)

    NG

    REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLY Click here