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Air Mix Door Motor (Driver) Diagnosis Procedure

WARNING: This page is about a different car, the 2013 Nissan Armada. However, it is still accessible from the selected car via links, so may be relevant.

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

SYMPTOM:

  1. CHECK AIR MIX DOOR MOTOR (DRIVER) POSITION BALANCED RESISTOR (PBR) FEEDBACK VOLTAGE 
    1. Turn ignition switch ON.
    2. Using CONSULT, check "DVR MIX FDBCK" in "DATA MONITOR" mode in "HVAC". Refer to "CONSULT FUNCTION (HVAC) ".
    3. Observe "DVR MIX FDBACK" voltage while rotating temperature control dial (driver) between 32°C (90°F) and 18°C (60°F).
      Monitor Item Condition Results
      DVR MIX FDBCK Rotate temperature control dial (driver) between 32°C (90°F) and 18°C (60°F) Voltage varies with dial rotation between 0.2 and 4.8 volts.

      Is the inspection result normal? 

      YES:

      • Air mix door motor (driver) is OK.
      • Inspect air mix door (driver) for mechanical failure and repair if necessary. If air mix door (driver) is OK, refer to "COMPONENT FUNCTION CHECK " for insufficient cooling or "COMPONENT FUNCTION CHECK " for insufficient heating.

      NO: GO TO 2.

  2. CHECK AIR MIX DOOR MOTOR (DRIVER) CIRCUITS FOR OPEN AND SHORT TO GROUND 
    1. Turn ignition switch OFF.
    2. Disconnect the A/C auto amp. harness connector M49 (A) and the air mix door motor (driver) harness connector M147 (B).
    3. Check continuity between A/C auto amp. harness connector M49 (A) terminals 17, 18 and the air mix door motor (driver) harness connector M147 (B) terminals 1, 6.
      A B Continuity
      Connector Terminal Connector Terminal
      M49 17 M147 1 Yes
      18 6
      Fig 1: Checking Driver Air Mix Door Motor Circuits For Open And Short To Ground
      G05706793Courtesy of NISSAN NORTH AMERICA, INC.
    4. Check continuity between A/C auto amp. harness connector M49 terminals 17, 18 and ground.
      Connector Terminal - Continuity
      M49 17 Ground No
      18
      Fig 2: Checking Continuity Between A/C Auto Amp. Harness Connector M49 Terminals 17, 18 And Ground
      G05706790Courtesy of NISSAN NORTH AMERICA, INC.

      Is the inspection result normal? 

      YES: GO TO 3.

      NO: Repair or replace harness as necessary.

  3. CHECK A/C AUTO AMP. FOR AIR MIX DOOR MOTOR (DRIVER) POWER AND GROUND 
    1. Reconnect A/C auto amp. harness connector.
    2. Turn ignition switch ON.
    3. Rotate temperature control dial (driver) to 32°C (90°F).
    4. Check voltage between A/C auto amp. harness connector M49 terminal 17 and terminal 18 while rotating temperature control dial (driver) to 18°C (60°F) and back to 32°C (90°F).
      Fig 3: Checking Voltage Between A/C Auto Amp. Harness Connector M49 Terminal 17 And 18
      G05706789Courtesy of NISSAN NORTH AMERICA, INC.
      Connector Terminals Condition Voltage (Approx.)
      (+) (-)
      M49 17 18 While rotating temperature control dial (driver) from 32°C (90°F) to 18°C (60°F) Battery voltage
      18 17 While rotating temperature control dial (driver) from 18°C (60°F) to 32°C (90°F) Battery voltage

      Is the inspection result normal? 

      YES: GO TO 4.

      NO: Replace A/C auto amp. Refer to "REMOVAL AND INSTALLATION ".

  4. CHECK AIR MIX DOOR MOTOR (DRIVER) PBR CIRCUITS FOR OPEN AND SHORT TO GROUND 
    1. Turn ignition switch OFF.
    2. Disconnect the A/C auto amp. harness connectors.
    3. Check continuity between A/C auto amp. harness connector M49 (C) terminal 3, connector M50 (A) terminal 28 and air mix door motor (driver) harness connector M147 (B) terminals 3, 2.
      A and C B Continuity
      Connector Terminal Connector Terminal
      M49 (C) 3 M147 2 Yes
      M50 (A) 28 3
      Fig 4: Checking Driver Air Mix Door Motor PBR Circuits For Open And Short To Ground
      G05706809Courtesy of NISSAN NORTH AMERICA, INC.
    4. Check continuity between A/C auto amp. harness connector M49 (C) terminal 3, M50 (A) terminal 28 and ground.
      Connector Terminal - Continuity
      M49 (C) 3 Ground No
      M50 (A) 28

      Is the inspection result normal? 

      YES: GO TO 5.

      NO: Repair or replace harness as necessary.

  5. CHECK PBR FEEDBACK SIGNAL CIRCUIT FOR OPEN AND SHORT TO GROUND 
    1. Check continuity between A/C auto amp. harness connector M49 (A) terminal 6 and air mix door motor (driver) harness connector M147 (B) terminal 4.
      A B Continuity
      Connector Terminal Connector Terminal
      M49 6 M147 4 Yes
      Fig 5: Checking Continuity Between A/C Auto Amp. Connector M49 Terminal 6 And Driver Air Mix Door Motor Connector M147 Terminal 4
      G05706800Courtesy of NISSAN NORTH AMERICA, INC.
    2. Check continuity between A/C auto amp. harness connector M49 terminal 6 and ground.
      Connector Terminal - Continuity
      M49 6 Ground No
      Fig 6: Checking Continuity Between A/C Auto Amp. Harness Connector M49 Terminal 6 And Ground
      G05706799Courtesy of NISSAN NORTH AMERICA, INC.

      Is the inspection result normal? 

      YES: GO TO 6.

      NO: Repair or replace harness as necessary.

  6. CHECK A/C AUTO AMP. FOR 5 VOLT REFERENCE (VREF), VREF RETURN, AND FEEDBACK SIGNAL 
    1. Reconnect A/C auto amp. harness connectors.
    2. Turn ignition switch ON.
    3. Check voltage between A/C auto amp. harness connector M49 (B) terminal 3, and M50 (A) terminal 28.
      A B  
      Connector Terminals Connector Terminals Voltage (Approx.)
      (+) (-)
      M50 28 M49 3 5 Volts
      Fig 7: Checking Voltage Between A/C Auto Amp. Harness Connector M49 Terminal 3 And M50 Terminal 28
      G05947564Courtesy of NISSAN NORTH AMERICA, INC.
    4. Check voltage between A/C auto amp. harness connector M49 terminal 6 and ground.
      Connector Terminal - Voltage (Approx.)
      M49 6 Ground 0 Volts
      Fig 8: Checking Voltage Between A/C Auto Amp. Harness Connector M49 Terminal 6 And Ground
      G05706798Courtesy of NISSAN NORTH AMERICA, INC.

      Is the inspection result normal? 

      YES: GO TO 7.

      NO: Replace A/C auto amp. Refer to "REMOVAL AND INSTALLATION ".

  7. CHECK A/C AUTO AMP. FOR FEEDBACK SIGNAL 
    1. Reconnect the air mix door motor (driver) harness connector M147.
    2. Check voltage between A/C auto amp. harness connector M49 terminal 6 and ground.
      Connector Terminal - Voltage (Approx.)
      M49 6 Ground 0.2 to 4.8 Volts
      Fig 9: Checking Voltage Between A/C Auto Amp. Harness Connector M49 Terminal 6 And Ground
      G05706798Courtesy of NISSAN NORTH AMERICA, INC.

      Is the inspection result normal? 

      YES: Inspect air mix door (driver) for binding or mechanical failure. If air mix door (driver) moves freely, replace A/C auto amp. Refer to "REMOVAL AND INSTALLATION ".

      NO: Replace air mix door motor (driver). Refer to "REMOVAL AND INSTALLATION ".

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