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Home >> Nissan-Datsun >> 2003 >> Sentra Limited >> Repair and Diagnosis >> External Pages >> Different car >> Section 2251 (Heater & Air Conditioning Control System (Automatic Air Conditioner)) >> DTC/Circuit Diagnosis >> Blower Motor Control System >> Rear Air Control (Rear) Diagnosis Procedure #3 >> Trouble Diagnosis Procedure

Trouble 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.
  1. CHECK REAR AIR CONTROL (FRONT)
    1. Disconnect rear air control (front) connector.
    2. Turn ignition switch ON.
    3. Press AUTO switch.

      Does rear blower motor operate in high speed? 

      YES: GO TO  17.

      NO: GO TO 2.

  2. CHECK REAR BLOWER MOTOR POWER SUPPLY
    1. Turn ignition switch OFF.
    2. Disconnect rear blower motor harness connector.
    3. Turn ignition switch ON.
    4. Press AUTO switch.
    5. Rotate rear air control (front) blower speed control dial to maximum speed (REAR CTRL indicator off).
    6. Check voltage between rear blower motor harness connector B501 terminal 2 and ground.

      Battery voltage should exist  .

      Fig 1: Checking Voltage Between Rear Blower Motor Harness Connector B501 Terminal 2 And Ground
      G05712633Courtesy of NISSAN NORTH AMERICA, INC.

      Is the inspection result normal? 

      YES: GO TO 3.

      NO: GO TO  9.

  3. CHECK VARIABLE BLOWER CONTROL (REAR) POWER SUPPLY
    1. Turn ignition switch OFF.
    2. Disconnect variable blower control (rear) connector.
    3. Turn ignition switch ON.
    4. Check voltage between variable blower control connector B133 terminal 4 and ground.

      Battery voltage should exist  .

      Fig 2: Checking Voltage Between Variable Blower Control Connector B133 Terminal 4 And Ground
      G06605919Courtesy of NISSAN NORTH AMERICA, INC.

      Is the inspection result normal? 

      YES: GO TO 4.

      NO: Repair harness or connector.

  4. CHECK VARIABLE BLOWER CONTROL (REAR) AUX BLOWER SPEED SIGNAL CIRCUIT FOR SHORT

    Check voltage between variable blower control (rear) harness connector B133 terminal 3 and ground.

    Connector Terminals Voltage (Approx.)
    (+) (-)
    Variable blower control: B133 3 Ground 4.5 V
    Fig 3: Checking Voltage Between Variable Blower Control (Rear) Harness Connector B133 Terminal 3 And Ground
    G06605920Courtesy of NISSAN NORTH AMERICA, INC.

    Is the inspection result normal? 

    YES: GO TO 5.

    NO: GO TO  8.

  5. CHECK VARIABLE BLOWER CONTROL (REAR) GROUND CIRCUIT
    1. Turn ignition switch OFF.
    2. Check continuity between variable blower control (rear) harness connector B133 terminal 1 and ground.

      Continuity should exist  .

      Fig 4: Checking Continuity Between Variable Blower Control (Rear) Harness Connector B133 Terminal 1 And Ground
      G06605921Courtesy of NISSAN NORTH AMERICA, INC.

      Is the inspection result normal? 

      YES: GO TO 6.

      NO: Repair harness or connector.

  6. CHECK REAR BLOWER MOTOR

    Check rear blower motor. Refer to "REAR BLOWER MOTOR AND RELAY COMPONENT INSPECTION ".

    Is the inspection result normal? 

    YES: GO TO 7.

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

  7. CHECK VARIABLE BLOWER CONTROL (REAR) BLOWER MOTOR GROUND CIRCUIT

    Check continuity between rear blower motor connector B501 (B) terminal 1 and variable blower control (rear) connector B133 (A) terminal 2.

    Continuity should exist  .

    Fig 5: Checking Continuity Between Rear Blower Motor Connector B501 Terminal 1 And Variable Blower Control (Rear) Connector B133 Terminal 2
    G06605922Courtesy of NISSAN NORTH AMERICA, INC.

    Is the inspection result normal? 

    YES: Replace A/C auto amp. Refer to "REMOVAL AND INSTALLATION ".

    NO: Repair harness or connector.

  8. CHECK VARIABLE BLOWER CONTROL (REAR) AUX BLOWER SPEED CIRCUIT FOR OPEN
    1. Turn ignition switch OFF.
    2. Disconnect A/C auto amp. connector.
    3. Check continuity between A/C auto amp. harness connector M49 (A) terminal 12 and variable blower control (rear) harness connector B133 (B) terminal 3.

      Continuity should exist  .

      Fig 6: Checking Continuity Between A/C Auto Amp. Harness Connector M49 Terminal 12 And Variable Blower Control (Rear) Harness Connector B133 Terminal 3
      G06605923Courtesy of NISSAN NORTH AMERICA, INC.

      Is the inspection result normal? 

      YES: Replace A/C auto amp. Refer to "REMOVAL AND INSTALLATION ".

      NO: Repair harness or connector.

  9. CHECK FUSES

    Check 15A fuses [Nos. 10 and 11, located in the fuse block (J/B)].

    Is the inspection result normal? 

    YES: GO TO 10.

    NO: GO TO  14.

  10. CHECK REAR BLOWER MOTOR RELAY

    Check rear blower motor relay. Refer to "REAR BLOWER MOTOR AND RELAY COMPONENT INSPECTION ".

    Is the inspection result normal? 

    YES: GO TO 11.

    NO: Replace rear blower motor relay.

  11. CHECK REAR BLOWER MOTOR CIRCUIT BETWEEN REAR BLOWER MOTOR AND FUSE BLOCK (J/B)
    1. Turn ignition switch OFF.
    2. Disconnect fuse block (J/B) M3 harness connector.
    3. Check continuity between fuse block (J/B) harness connector M3 (A) terminal 3N and 8N and rear blower motor harness connector B501 (B) terminal 2.

      Continuity should exist  .

      Fig 7: Checking Continuity Between Fuse Block (J/B) Harness Connector M3 Terminal 3N And 8N And Rear Blower Motor Harness Connector B501 Terminal 2
      G05712639Courtesy of NISSAN NORTH AMERICA, INC.

      Is the inspection result normal? 

      YES: GO TO 12.

      NO: Repair harness or connector.

  12. CHECK REAR BLOWER MOTOR RELAY (COIL SIDE) GROUND CIRCUIT

    Check continuity between fuse block (J/B) harness connector M3 terminal 7N and ground.

    Continuity should exist  .

    Fig 8: Checking Continuity Between Fuse Block (J/B) Connector M3 Terminal 7N And Ground
    G04908336Courtesy of NISSAN NORTH AMERICA, INC.

    Is the inspection result normal? 

    YES: GO TO 13.

    NO: Repair harness or connector.

  13. CHECK REAR BLOWER MOTOR RELAY (COIL SIDE) POWER SUPPLY CIRCUIT FOR OPEN
    1. Turn ignition switch ON.
    2. Check voltage between rear blower motor relay harness connector J-1 terminal 1 and ground.

      Battery voltage should exist  .

      Fig 9: Checking Voltage Between Rear Blower Motor Relay Harness Connector J-1 Terminal 1 And Ground
      G05942162Courtesy of NISSAN NORTH AMERICA, INC.

      Is the inspection result normal? 

      YES: Replace fuse block (J/B).

      NO: Repair harness or connector.

  14. REPLACE FUSE
    1. Turn ignition switch OFF.
    2. Replace fuses.
    3. Reconnect all disconnected parts.
    4. Turn ignition switch ON.
    5. Activate the rear blower motor from the rear air control (front).

      Does the fuse blow? 

      YES: GO TO 15.

      NO: Inspection End.

  15. CHECK REAR BLOWER MOTOR

    Check rear blower motor. Refer to "REAR BLOWER MOTOR AND RELAY COMPONENT INSPECTION ".

    Is the inspection result normal? 

    YES: GO TO 16.

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

  16. CHECK REAR BLOWER MOTOR POWER SUPPLY CIRCUIT FOR SHORT
    1. Turn ignition switch OFF.
    2. Disconnect fuse block (J/B) M3 harness connector and variable blower control (rear).
    3. Check continuity between rear blower motor harness connector B501 terminal 2 and ground.

      Continuity should not exist  .

      Fig 10: Checking Continuity Between Rear Blower Motor Harness Connector B501 Terminal 2 And Ground
      G05712642Courtesy of NISSAN NORTH AMERICA, INC.

      Is the inspection result normal? 

      YES: Replace variable blower control (rear). Refer to "REMOVAL AND INSTALLATION ".

      NO: Repair harness or connector.

  17. CHECK REAR AIR CONTROL (FRONT) POWER SUPPLY

    Check voltage between rear air control (front) harness connector R2 terminal 10 and ground.

    Battery voltage should exist  .

    Fig 11: Checking Voltage Between Rear Air Control (Front) Harness Connector R2 Terminal 10 And Ground
    G05712626Courtesy of NISSAN NORTH AMERICA, INC.

    Is the inspection result normal? 

    YES: GO TO 18.

    NO: Repair harness or connector.

  18. CHECK A/C AUTO AMP. FRONT AUX BLOWER POT CIRCUIT FOR SHORT
    1. Turn ignition switch OFF.
    2. Disconnect A/C auto amp. harness connector M50.
    3. Check continuity between rear air control (front) harness connector R2 terminal 6 and ground.

      Continuity should not exist  .

      Fig 12: Checking Continuity Between Rear Air Control (Front) Harness Connector R2 Terminal 6 And Ground
      G05942165Courtesy of NISSAN NORTH AMERICA, INC.

      Is the inspection result normal? 

      YES: Replace rear air control (front) Refer to "REMOVAL AND INSTALLATION ".

      NO: Repair harness or connector.

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