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Diagnostic Procedure For Magnet Clutch

WARNING: This page is about a different car, the 2005 Nissan Quest. However, it is still accessible from the selected car via links, so may be relevant.

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

Fig 1: Identifying Magnet Clutch Diagnostic Procedure Diagram
G02476954Courtesy of NISSAN MOTOR CO., U.S.A.
  1. CHECK INTAKE SENSOR CIRCUIT 

    Check intake sensor. Refer to "A/C SYSTEM SELF-DIAGNOSIS FUNCTION ".

    OK or NG

  2. PERFORM AUTO ACTIVE TEST 

    Refer to "AUTO ACTIVE TEST ".

    Does magnet clutch operate?

    Yes or No

    • Yes :
      • WITH CONSULT-II

        GO TO  5.

      • WITHOUT CONSULT-II

        GO TO  6.

    • No: Check 10A fuse (No. 33, located in IPDM E/R), and GO TO 3.
  3. CHECK CIRCUIT CONTINUITY BETWEEN IPDM E/R AND COMPRESSOR 
    1. Turn ignition switch OFF.
    2. Disconnect IPDM E/R connector and compressor (magnet clutch) connector.
    3. Check continuity between IPDM E/R harness connector E124 terminal 33 (Y/B) and compressor harness connector F3 terminal 1 (Y/B).
      Fig 2: Checking Continuity Between IPDM E/R Harness Connector E124 Terminal 33 & Compressor Harness Connector F3 Terminal 1
      G02476955Courtesy of NISSAN MOTOR CO., U.S.A.
      • 33 - 1: Continuity should exist. 

    OK or NG

    • OK: GO TO 4.
    • NG: Repair harness or connector.
  4. CHECK MAGNET CLUTCH CIRCUIT 

    Check for operation sound when applying battery voltage direct current to terminal.

    Fig 3: Checking Magnet Clutch Circuit
    G02476956Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG

  5. CHECK BCM INPUT (COMPRESSOR ON) SIGNAL 

    Check compressor. Refer to "CONSULT-II FUNCTION (BCM) ".

    Fig 4: DATA MONITOR - CONSULT-II Display Screen ON/OFF Signal
    G02476957Courtesy of NISSAN MOTOR CO., U.S.A.
    • A/C SW ON: COMP ON SIG ON 
    • A/C SW OFF: COMP ON SIG OFF 

    OK or NG

    • OK: GO TO  8.
    • NG: GO TO 6.
  6. 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 terminal 27 (L/R) and front air control harness connector M49 terminal 12 (L/R).
      Fig 5: Checking Continuity Between BCM Harness Connector M18 Terminal 27 & Front Air Control Harness Connector M49 Terminal 12
      G02476958Courtesy of NISSAN MOTOR CO., U.S.A.
      • Continuity should exist. 

    OK or NG

    • OK: GO TO 7.
    • NG: Repair harness or connector.
  7. CHECK VOLTAGE FOR FRONT AIR CONTROL (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 12 (L/R) and ground.
      Fig 6: Terminals Voltage Specification Chart
      G02476959Courtesy of NISSAN MOTOR CO., U.S.A.
      Fig 7: Checking Voltage Between Front Air Control Harness Connector M49 Terminal 12 & Ground
      G02476960Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG

    • OK: GO TO 8.
    • NG-1: If the voltage is approx. 5V when A/C switch is ON, replace front air control.
    • NG-2: If the voltage is approx. 0V when A/C switch is OFF, replace BCM.
  8. CHECK REFRIGERANT PRESSURE SENSOR 

    With CONSULT-II 

    1. Start engine.
    2. Check voltage of refrigerant pressure sensor. Refer to "CONSULT-II FUNCTION (BCM) ".

    Without CONSULT-II 

    1. Start engine.
    2. Check voltage between ECM harness connector F54 terminal 70 (W) and ground.
      Fig 8: Voltage Reference Chart
      G02476961Courtesy of NISSAN MOTOR CO., U.S.A.
      Fig 9: Checking Voltage Between ECM Harness Connector F54 Terminal 70 & Ground
      G02476962Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG

  9. CHECK BCM INPUT (FAN ON) SIGNAL 

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

    Fig 10: DATA MONITOR - CONSULT-II Display FAN ON/OFF Signal Screen
    G02476963Courtesy of NISSAN MOTOR CO., U.S.A.
    • FAN CONTROL SWITCH ON: FAN ON SIG ON 
    • FAN CONTROL SWITCH OFF: FAN ON SIG OFF 

    OK or NG

    • OK: GO TO  12.
    • NG: GO TO 10.
  10. 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 terminal 28 (G/B) and front air control harness connector M49 terminal 26 (G/B).
      Fig 11: Checking Continuity Between BCM Harness Connector M18 Terminal 28 & Front Air Control Harness Connector M49 Terminal 26
      G02476964Courtesy of NISSAN MOTOR CO., U.S.A.
      • Continuity should exist. 

    OK or NG

    • OK: GO TO 11.
    • NG: Repair harness or connector.
  11. CHECK VOLTAGE FOR FRONT AIR CONTROL (FAN 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 26 (G/B) and ground.
      Fig 12: Voltage Reference Chart
      G02476965Courtesy of NISSAN MOTOR CO., U.S.A.
      Fig 13: Checking Voltage Between Front Air Control Harness Connector M49 Terminal 26 & Ground
      G02476966Courtesy of NISSAN MOTOR CO., U.S.A.

    OK or NG

    • OK: GO TO 12.
    • NG-1: If the voltage is approx. 5V when blower motor is ON, replace front air control.
    • NG-2: If the voltage is approx. 0V when blower motor is OFF, replace BCM. Refer to "REMOVAL AND INSTALLATION OF BCM ".
  12. CHECK CAN COMMUNICATION 

    Check CAN communication. Refer to "CAN COMMUNICATION SYSTEM DESCRIPTION ".

    • BCM - ECM
    • ECM - IPDM E/R
    • ECM - Front air control

    OK or NG

    • OK: Inspection End.
    • NG: Repair or replace malfunctioning part(s).
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