Diagnostic Procedure For Magnet Clutch

SYMPTOM: Magnet clutch does not engage when A/C switch is ON.

Fig 1: Idnetifying Front Air Control Circuit Diagram

1. PERFORM AUTO ACTIVE TEST 

   Refer to "AUTO ACTIVE TEST ".

   Does magnet clutch operate?

   Yes or No 

   YES:

   • WITH CONSULT-II

     GO TO 2.

   • WITHOUT CONSULT-II

     GO TO  8.

   NO: Check 10A fuse (No. 42, located in IPDM E/R), and GO TO  12.

2. CHECK BCM INPUT (A/C COMPRESSOR ON) SIGNAL 

   Check A/C compressor ON/OFF signal. Refer to "CONSULT-II FUNCTION (BCM) ".

   A/C SW ON : COMP ON SIG ON 

   A/C SW OFF : COMP ON SIG OFF 

   Fig 2: Identifying CONSULT-II Display - DATA MONITOR

   

   OK or NG 

   OK: GO TO 3.

   NG: GO TO  8.

3. CHECK REFRIGERANT PRESSURE SENSOR 

   Check refrigerant pressure sensor. Refer to "REFRIGERANT PRESSURE SENSOR ".

   OK or NG 

   OK: GO TO 4.

   NG: Replace refrigerant pressure sensor. Refer to "REMOVAL AND INSTALLATION ".

4. CHECK BCM INPUT (FAN ON) SIGNAL 

   Check FAN ON/OFF signal. Refer to "CONSULT-II FUNCTION (BCM) ".

   BLOWER CONTROL DIAL ON : FAN ON SIG ON 

   BLOWER CONTROL DIAL OFF : FAN ON SIG OFF 

   OK or NG 

   Fig 3: Identifying CONSULT-II Display - DATA MONITOR

   

   OK: GO TO  7.

   NG: GO TO 5.

5. CHECK CIRCUIT CONTINUITY BETWEEN BCM AND FRONT AIR CONTROL 
   1. Turn ignition switch OFF.
   2. Disconnect BCM connector and front air control connector.
   3. Check continuity between BCM harness connector M18 (A) terminal 28 and front air control harness connector M49 (B) terminal 18.
      TERMINALS CONTINUITY REFERENCE
      
      

      A		B
      Connector	Terminal	Connector	Terminal	Continuity
      BCM: M18	28	Front air control: M49	18	Yes

      Fig 4: Checking Continuity Between BCM Terminal 28 And Front Air Control Connector Terminal 18

      

   OK or NG 

   OK: GO TO 6.

   NG: Repair harness or connector.

6. CHECK VOLTAGE FOR FRONT AIR CONTROL (FAN ON SIGNAL) 
   1. Reconnect BCM connector and front air control connector.
   2. Turn ignition switch ON.
   3. Turn A/C switch ON.
   4. Check voltage between front air control harness connector M49 terminal 18 and ground.
      TERMINALS VOLTAGE SPECIFICATION
      
      

      Terminals			Condition	Voltage (Approx.)
      (+)		(-)
      Front air control connector	Terminal No.
      M49	18	Ground	A/C switch: ON Blower motor operates	0V
      			A/C switch: OFF	5V

      Fig 5: Checking Voltage Between Front Air Control Connector M49 Terminal 18 And Ground

      

   OK or NG 

   OK: Replace BCM. Refer to "REMOVAL AND INSTALLATION ".

   NG-1: If the voltage is approx. 5V when blower motor is ON, replace front air control. Refer to "CONTROL UNIT ".

   NG-2: If the voltage is approx. 0V when blower motor is OFF, replace BCM. Refer to "REMOVAL AND INSTALLATION ".

7. CHECK CAN COMMUNICATION 

   Check CAN communication. Refer to "TROUBLE DIAGNOSIS ".

   OK or NG 

   OK: Inspection End.

   NG: Repair or replace malfunctioning part(s).

8. CHECK VOLTAGE FOR FRONT AIR CONTROL (A/C COMPRESSOR ON SIGNAL) 
   1. Reconnect BCM connector and front air control connector.
   2. Turn ignition switch ON.
   3. Check voltage between front air control harness connector M49 terminal 10 and ground.
      TERMINALS VOLTAGE SPECIFICATION
      
      

      Terminals			Condition	Voltage (Approx.)
      (+)		(-)
      Front air control connector	Terminal No.
      M49	10	Ground	A/C switch: ON	0V
      			A/C switch: OFF	Battery voltage

      Fig 6: Checking Voltage Between Front Air Control Connector M49 Terminal 10 And Ground

      

   OK or NG 

   OK: GO TO 9.

   NG-1: If the voltage is approx. 5V when A/C switch is ON, replace front air control. Refer to "CONTROL UNIT ".

   NG-2: If the voltage is approx. 0V when A/C switch is OFF, replace BCM. Refer to "REMOVAL AND INSTALLATION ".

9. CHECK CIRCUIT CONTINUITY BETWEEN BCM AND FRONT AIR CONTROL 
   1. Disconnect BCM connector and front air control connector.
   2. Check continuity between BCM harness connector M18 terminal 27 and front air control harness connector M49 terminal 10.

      27 - 10 : Continuity should exist. 

      Fig 7: Checking Continuity Between BCM Terminal 27 And Front Air Control Connector Terminal 10

      

   OK or NG 

   OK: GO TO 10.

   NG: Repair harness or connector.

10. CHECK INTAKE SENSOR CIRCUITS 

    Check intake sensor. Refer to "INTAKE SENSOR CIRCUIT ".

    OK or NG 

    OK: GO TO 11.

    NG: Replace intake sensor. Refer to "INTAKE SENSOR ".

11. CHECK CAN COMMUNICATION 

    Check CAN communication. Refer to "TROUBLE DIAGNOSIS ".

    OK or NG 

    OK: Replace BCM. Refer to "REMOVAL AND INSTALLATION ".

    NG: Repair or replace malfunctioning part(s).

12. CHECK MAGNET CLUTCH CIRCUIT 

    Check for operation sound when applying battery voltage to terminal.

    OK or NG 

    OK: GO TO 13.

    Fig 8: Applying Battery Voltage To A/C Compressor Terminal

    

    NG: Replace magnet clutch. Refer to "REMOVAL AND INSTALLATION FOR COMPRESSOR CLUTCH ".

13. CHECK CIRCUIT CONTINUITY BETWEEN IPDM E/R AND A/C COMPRESSOR 
    1. Turn ignition switch OFF.
    2. Disconnect IPDM E/R connector and A/C compressor (magnet clutch) connector.
    3. Check continuity between IPDM E/R harness connector E119 terminal 11 and A/C compressor harness connector F3 terminal 1.

       11 - 1 : Continuity should exist. 

       Fig 9: Checking Continuity Between IPDM E/R Terminal 11 And A/C Compressor Connector Terminal 1

       

    OK or NG 

    OK: Replace IPDM E/R. Refer to "REMOVAL AND INSTALLATION OF IPDM E/R ".

    NG: Repair harness or connector.