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.

INSPECTION PROCEDURE

PROCEDURE

1. Click here

   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.

      Table 1. Air Conditioner

      Tester Display	Test Part	Control Range	Diagnostic Note
      Rear A/C Mag Valv	Rear cooling unit expansion valve	OFF or ON	-

   
   
   • OKClick here
   • NGClick here
2. Click here

   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

   
   
   • OKClick here
   • NGClick here
3. Click here

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

   
   
   1. 

      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 Ω Engine switch on (IG) 11 to 14 V

   
   
   • OKClick here
   • NGClick here
4. Click here

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

   
   

   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

   
   
   • OKClick here
   • NGClick here
5. Click here

   CHECK REAR COOLING UNIT EXPANSION VALVE (OPERATION)

   
   

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

      Tip:

      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.

   
   
   • OKClick here
   • NGClick here
6. Click here

   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.

   
   
   • OKClick here
   • NGClick here
7. Click here

   REPLACE WIRING AIR CONDITIONING HARNESS SUB-ASSEMBLY

8. Click here

   REPLACE AIR CONDITIONING AMPLIFIER ASSEMBLYClick here

9. Click here

   REPLACE FUSE

10. Click here

    REPAIR OR REPLACE HARNESS OR CONNECTOR

11. Click here

    REPLACE REAR COOLING UNIT EXPANSION VALVEClick here