LEMON Manuals: Even more car manuals for everyone
Home >> Nissan-Datsun >> 2004 >> Altima S, Standard >> Repair and Diagnosis >> External Pages >> Different car >> Section 1075 (Heater & Air Conditioning Control System (Automatic Air Conditioner)) >> DTC/Circuit Diagnosis >> Air Mix Door Motor >> Air Mix Door Motor (Driver) Diagnosis Procedure

Air Mix Door Motor (Driver) 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 - AUTOMATIC ".

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 4.8V.

      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 and the air mix door motor (driver) harness connector M147.
    3. Check continuity between A/C auto amp. harness connector M49 terminals 17, 18 and the air mix door motor (driver) harness connector M147 terminals 5, 6.
      Connector Terminal Connector Terminal Continuity
      M49 17 M147 6 Yes
      18 5
    4. Check continuity between A/C auto amp. harness connector M49 terminals 17, 18 and ground.
      Connector Terminal - Continuity
      M49 17 Ground No
      18

      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).
      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 terminal 3, connector M50 terminal 28 and air mix door motor (driver) harness connector M147 terminals 1, 3.
      Connector Terminal Connector Terminal Continuity
      M49 3 M147 3 Yes
      M50 28 1
    4. Check continuity between A/C auto amp. harness connector M49 terminal 3, M50 terminal 28 and ground.
      Connector Terminal - Continuity
      M49 3 Ground No
      M50 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 terminal 6 and air mix door motor (driver) harness connector M147 terminal 2.
      Connector Terminal Connector Terminal Continuity
      M49 6 M147 2 Yes
    2. Check continuity between A/C auto amp. harness connector M49 terminal 6 and ground.
      Connector Terminal - Continuity
      M49 6 Ground No

      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 terminal 3, and M50 terminal 28.
      Connector Terminals Connector Terminals Voltage (Approx.)
      (+) (-)
      M50 28 M49 3 5V
    4. Check voltage between A/C auto amp. harness connector M49 terminal 6 and ground.
      Connector Terminal - Voltage (Approx.)
      M49 6 Ground 0V

      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 4.8V

      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 ".

scientia non olet · About LEMON Manuals