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Home >> Nissan-Datsun >> 2004 >> Altima S, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 1076 (Heater & Air Conditioning Control System (Manual Air Conditioner)) >> DTC/Circuit Diagnosis >> Magnet Clutch >> Magnet Clutch Diagnosis Procedure >> Diagnostic Procedure For Magnet Clutch

Diagnostic Procedure For Magnet Clutch

WARNING: This page is about a different car, the 2012 Nissan Pathfinder. 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: Magnetic Clutch - Circuit Diagram (A/C Switch ON)
G08167680Courtesy of NISSAN NORTH AMERICA, INC.
  1. PERFORM AUTO ACTIVE TEST

    Refer to "CONSULT FUNCTION (IPDM E/R) ".

    Does magnet clutch operate?

    YES or NO 

    YES >>

    • WITH CONSULT

    GO TO 2.

    • WITHOUT CONSULT

    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 "AIR CONDITIONER: CONSULT FUNCTION (BCM - AIR CONDITIONER) ".

    A/C SW ON: AIR COND SW ON 

    A/C SW OFF: AIR COND SW OFF 

    Is the inspection result normal? 

    YES: GO TO 3.

    NO: GO TO  8.

  3. CHECK REFRIGERANT PRESSURE SENSOR

    Check refrigerant pressure sensor. Refer to "DIAGNOSIS PROCEDURE " (VQ40DE) or "DIAGNOSIS PROCEDURE " (VK56DE).

    Is the inspection result normal? 

    YES: GO TO 4.

    NO: Replace refrigerant pressure sensor. Refer to "REMOVAL AND INSTALLATION FOR REFRIGERANT PRESSURE SENSOR ".

  4. CHECK BCM INPUT (FAN ON) SIGNAL

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

    BLOWER CONTROL DIAL ON: FAN ON SIG ON

    BLOWER CONTROL DIAL OFF: FAN ON SIG OFF

    Is the inspection result normal? 

    YES: GO TO  7.

    NO: 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 M52 (B) terminal 18.
      A B  
      Connector Terminal Connector Terminal Continuity
      BCM: M18 28 Front air control: M52 18 Yes
      Fig 2: Checking Continuity Between BCM Connector M18 Terminal 28 And Front Air Control Connector M52 Terminal 18
      G08167681Courtesy of NISSAN NORTH AMERICA, INC.

      Is the inspection result normal? 

      YES: GO TO 6.

      NO: 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 M52 terminal 18 and ground.
      Terminals Condition Voltage (Approx.)
      (+) (-)
      Front air control connector Terminal No.
      M52 18 Ground A/C switch: ON Blower motor operates 0V
      A/C switch: OFF Battery voltage
      Fig 3: Checking Voltage Between Front Air Control Connector M52 Terminal 18 And Ground
      G08167682Courtesy of NISSAN NORTH AMERICA, INC.

      Is the inspection result normal? 

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

      NO-1 >> If the voltage is approx. 5V when blower motor is ON, replace front air control. Refer to "REMOVAL AND INSTALLATION ".

      NO-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 FLOW CHART ".

    Is the inspection result normal? 

    YES: Inspection End.

    NO: 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 M52 terminal 10 and ground.
      Terminals Condition Voltage (Approx.)
      (+) (-)
      Front air control connector Terminal No.
      M52 10 Ground A/C switch: ON Approx. 0V
      A/C switch: OFF Approx. 5V
      Fig 4: Checking Voltage Between Front Air Control Connector M52 Terminal 10 And Ground
      G08167683Courtesy of NISSAN NORTH AMERICA, INC.

      Is the inspection result normal? 

      YES: GO TO 9.

      NO-1 >> If the voltage is approx. 5V when A/C switch is ON, replace front air control. Refer to "REMOVAL AND INSTALLATION ".

      NO-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 M52 terminal 10.

      27 - 10: Continuity should exist  .

    3. Check continuity between BCM harness connector M18 terminal 27 and ground.

      27 - ground: Continuity should not exist  .

      Is the inspection result normal? 

      YES: GO TO 10.

      NO: Repair harness or connector.

  10. CHECK INTAKE SENSOR CIRCUITS

    Check intake sensor. Refer to "REMOVAL AND INSTALLATION ".

    Is the inspection result normal? 

    YES: GO TO 11.

    NO: Replace intake sensor. Refer to "REMOVAL AND INSTALLATION ".

  11. CHECK CAN COMMUNICATION

    Check CAN communication. Refer to "TROUBLE DIAGNOSIS FLOW CHART ".

    Is the inspection result normal? 

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

    NO: Repair or replace malfunctioning part(s).

  12. CHECK MAGNET CLUTCH CIRCUIT

    Check for operation sound when applying battery voltage to terminal.

    Is the inspection result normal? 

    YES: GO TO 13.

    NO: Replace magnet clutch. Refer to "REMOVAL AND INSTALLATION FOR COMPRESSOR CLUTCH ".

    Fig 5: Applying Battery Voltage To A/C Compressor Connector
    G08167684Courtesy of NISSAN NORTH AMERICA, INC.
  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  .

    4. Check continuity between IPDM E/R harness connector E119 terminal 11 and ground.

      11 - ground: Continuity should not exist  .

      Is the inspection result normal? 

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

      NO: Repair harness or connector.

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