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Front Blower Motor Diagnosis Procedure

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.

Regarding Wiring Diagram information, refer to "WIRING DIAGRAM - MANUAL ".

SYMPTOM: Blower motor operation is malfunctioning under starting blower speed control.

Fig 1: Front Blower Motor - Circuit Diagram
G08167668Courtesy of NISSAN NORTH AMERICA, INC.
  1. DIAGNOSTIC PROCEDURE
    1. Turn ignition switch ON.
    2. Turn the front blower switch to each of its four speeds.

      Does blower motor rotate normally at each speed?

      YES or NO 

      YES: Inspection End.

      NO >>

      1. Does not rotate at any speed, GO TO 2.
      2. Does not rotate at 1 - 3 speed, GO TO  13.
      3. Does not rotate at 4 speed, GO TO  16.
  2. CHECK FUSES
    1. Check 15A fuses (Nos. 24 and 27, located in the fuse and fusible link box). Refer to "TERMINAL ARRANGEMENT ".
    2. Check 10A fuse [No. 8, located in the fuse block (JB)]. Refer to "TERMINAL ARRANGEMENT ".

      Is inspection result normal? 

      YES: GO TO 3.

      NO: GO TO  8.

  3. CHECK FRONT BLOWER MOTOR POWER SUPPLY
    1. Turn ignition switch OFF.
    2. Disconnect front blower motor harness connector.
    3. Turn ignition switch ON.
    4. Select any front blower speed except OFF.
    5. Check voltage between front blower motor harness connector M62 terminal 2 and ground.

      2 - Ground: Battery voltage 

      Fig 2: Checking Voltage Between Front Blower Motor Connector M62 Terminal 2 And Ground
      G08167669Courtesy of NISSAN NORTH AMERICA, INC.

      Is inspection result normal? 

      YES: GO TO  12.

      NO: GO TO 4.

  4. CHECK FRONT BLOWER MOTOR RELAY
    1. Turn Ignition switch OFF.
    2. Check front blower motor relay. Refer to "FRONT BLOWER MOTOR COMPONENT INSPECTION ".

      Is inspection result normal? 

      YES: GO TO 5.

      NO: Replace front blower motor relay.

  5. CHECK FRONT BLOWER MOTOR RELAY POWER SUPPLY (SWITCH SIDE)

    Check voltage between front blower motor relay harness connector E54 terminals 7 and 5 and ground.

    A Condition Voltage (Approx.)
    (+)  
    Front air control connector Terminal (-)    
    M54 5 Ground Blower motor relay power supply Battery voltage
    M54 7 Ground Blower motor relay power supply Battery voltage
    Fig 3: Checking Voltage Between Front Blower Motor Relay Connector E54 Terminals 5, 7 And Ground
    G08167670Courtesy of NISSAN NORTH AMERICA, INC.

    Is inspection result normal? 

    YES: GO TO 6.

    NO: Repair harness or connector.

  6. CHECK FRONT BLOWER MOTOR RELAY POWER SUPPLY (COIL SIDE)
    1. Turn ignition switch ON.
    2. Check voltage between front blower motor relay harness connector E54 terminal 1 and ground.
      A Condition Voltage (Approx.)
      (+)  
      Front air control connector Terminal (-)    
      M54 1 Ground Blower motor relay power supply (coil side) Battery voltage
      Fig 4: Checking Voltage Between Front Blower Motor Relay Connector E54 Terminal 1 And Ground
      G08167671Courtesy of NISSAN NORTH AMERICA, INC.

      Is inspection result normal? 

      YES: GO TO 7.

      NO: Repair or replace harness as necessary.

  7. CHECK FRONT BLOWER MOTOR POWER FROM RELAY TO FRONT BLOWER MOTOR
    1. Turn ignition switch OFF.
    2. Check continuity between front blower motor relay harness connector E54 terminals 6 and 3 and front blower motor harness connector M62 terminal 2.

      3, 6 - 2: Continuity should exist  .

      Fig 5: Checking Continuity Between Front Blower Motor Power From Relay And Front Blower Motor
      G08167672Courtesy of NISSAN NORTH AMERICA, INC.

      Is inspection result normal? 

      YES: Repair open front blower motor relay ground circuit.

      NO: Repair harness or connector between the front blower motor relay and the front blower motor.

  8. REPLACE FUSE

    Refer to "TERMINAL ARRANGEMENT ".

    Does fuse No. 24 or 27 open when the front blower motor is turned on?

    YES or NO 

    YES: GO TO  10.

    NO: GO TO 9.

  9. REPLACE FUSE

    Refer to "TERMINAL ARRANGEMENT ".

    Does fuse No. 8 open when the ignition switch is turned ON?

    YES or NO 

    YES: Repair or replace harness as necessary.

    NO: Inspection End.

  10. CHECK FRONT BLOWER MOTOR POWER SUPPLY CIRCUIT FOR SHORT
    1. Turn ignition switch OFF.
    2. Disconnect front blower motor connector.
    3. Check continuity between front blower motor harness connector M62 terminal 2 and ground.

      2 - Ground: Continuity should not exist  .

      Fig 6: Checking Continuity Between Front Blower Motor Connector M62 Terminal 2 And Ground
      G08167673Courtesy of NISSAN NORTH AMERICA, INC.

      Is inspection result normal? 

      YES: GO TO 11.

      NO: Repair or replace harness as necessary.

  11. CHECK FRONT BLOWER MOTOR RELAY (SWITCH SIDE) POWER SUPPLY CIRCUIT FOR SHORT
    1. Disconnect front blower motor relay connector.
    2. Check continuity between the front blower motor relay harness connector E54 terminal 7 and terminal 5 and ground.

      7, 5 - Ground: Continuity should not exist  .

      Fig 7: Checking Continuity Between Front Blower Motor Relay Connector E54 Terminal 5, 7 And Ground
      G08167674Courtesy of NISSAN NORTH AMERICA, INC.

      Is inspection result normal? 

      YES: Check front blower motor. Refer to "FRONT BLOWER MOTOR DIAGNOSIS PROCEDURE ".

      NO: Repair harness or connector.

  12. CHECK FRONT BLOWER MOTOR
    1. Turn ignition switch OFF.
    2. Check front blower motor. Refer to "FRONT BLOWER MOTOR COMPONENT INSPECTION ".

      Is inspection result normal? 

      YES: GO TO 13.

      NO: Replace front blower motor. Refer to "TERMINAL ARRANGEMENT ".

  13. CHECK FRONT BLOWER MOTOR RESISTOR

    Check front blower motor resistor. Refer to "FRONT BLOWER MOTOR COMPONENT INSPECTION ".

    Is inspection result normal? 

    YES: GO TO 14.

    NO: Replace front blower motor resistor. Refer to "REMOVAL AND INSTALLATION ".

  14. CHECK FRONT BLOWER SWITCH

    Check front blower switch. Refer to "FRONT BLOWER MOTOR COMPONENT INSPECTION ".

    Is inspection result normal? 

    YES: GO TO 15.

    NO: Replace front blower switch. Refer to "REMOVAL AND INSTALLATION ".

  15. CHECK FRONT BLOWER MOTOR GROUND CIRCUIT TO FRONT BLOWER MOTOR RESISTOR
    1. Disconnect front blower motor resistor harness connector.
    2. Check continuity between front blower motor connector M62 (A) terminal 1 and front blower motor resistor harness connector M121 (B) terminal 3.
      A B  
      Connector Terminal Connector Terminal Continuity
      Front blower motor: M62 1 Front blower motor resistor: M121 3 Yes
      Fig 8: Checking Continuity Between Front Blower Motor Ground Circuit And Front Blower Motor Resistor
      G08167675Courtesy of NISSAN NORTH AMERICA, INC.

      Is inspection result normal? 

      YES: Repair harness or connector between front blower switch connector M51 terminal 8 and ground.

      NO: Repair harness or connector between front blower motor resistor and front blower motor.

  16. CHECK FRONT BLOWER SWITCH

    Check front blower switch. Refer to "FRONT BLOWER MOTOR COMPONENT INSPECTION ".

    Is inspection result normal? 

    YES: Repair harness or connector between front blower motor switch connector M51 terminal 8 and front blower motor resistor connector M121 terminal 3.

    NO: Replace front blower switch. Refer to "REMOVAL AND INSTALLATION ".

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