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Home >> Nissan-Datsun >> 2003 >> Sentra Limited >> Repair and Diagnosis >> External Pages >> Different car >> Section 2252 (Heater & Air Conditioning Control System (Manual Air Conditioner)) >> DTC/Circuit Diagnosis >> Air Mix Door Motor >> Air Mix Door Motor Diagnosis Procedure

Air Mix Door 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:

  1. CHECK AIR MIX DOOR MOTOR CIRCUITS FOR OPEN AND SHORT TO GROUND
    1. Turn ignition switch OFF.
    2. Disconnect the front air control harness connector M52 and the air mix door motor harness connector M149.
    3. Check continuity between front air control harness connector M52 terminals 2, 3 and the air mix door motor harness connector M149 terminals 5, 6.
      Connector Terminal Connector Terminal Continuity
      M52 2 M149 6 Yes
      3 5
    4. Check continuity between front air control harness connector M52 terminals 2, 3 and ground.
      Connector Terminal - Continuity
      M52 2 Ground No
      3

      Is the inspection result normal? 

      YES: GO TO 2.

      NO: Repair or replace harness as necessary.

  2. CHECK FRONT AIR CONTROL FOR AIR MIX DOOR MOTOR POWER AND GROUND
    1. Reconnect front air control harness connector.
    2. Turn ignition switch ON.
    3. Rotate temperature control dial to 32°C (90°F).
    4. Check voltage between front air control harness connector M52 terminal 2 and terminal 3 while rotating temperature control dial to 18°C (60°F) and back to 32°C (90°F).
      Connector Terminals Condition Voltage (Approx.)
      (+) (-)
      M52 2 3 While rotating temperature control dial from 32°C (90°F) to 18°C (60°F) Battery voltage
      3 2 While rotating temperature control dial from 18°C (60°F) to 32°C (90°F) Battery voltage

      Is the inspection result normal? 

      YES: GO TO 3.

      NO: Replace front air control. Refer to "REMOVAL AND INSTALLATION ".

  3. CHECK AIR MIX DOOR MOTOR PBR CIRCUITS FOR OPEN AND SHORT TO GROUND
    1. Turn ignition switch OFF.
    2. Disconnect the front air control harness connector M52.
    3. Check continuity between front air control harness connector M52 terminals 23, 26 and air mix door motor harness connector M149 terminals 1, 3.
      Connector Terminal Connector Terminal Continuity
      M52 23 M149 1 Yes
      26 3
    4. Check continuity between front air control harness connector M52 terminals 23, 26 and ground.
      Connector Terminal - Continuity
      M52 23 Ground No
      26

      Is the inspection result normal? 

      YES: GO TO 4.

      NO: Repair or replace harness as necessary.

  4. CHECK PBR FEEDBACK SIGNAL CIRCUIT FOR OPEN AND SHORT TO GROUND
    1. Check continuity between front air control harness connector M52 terminal 22 and air mix door motor harness connector M149 terminal 2.
      Connector Terminal Connector Terminal Continuity
      M52 22 M149 2 Yes
    2. Check continuity between front air control harness connector M52 terminal 22 and ground.
      Connector Terminal - Continuity
      M52 22 Ground No

      Is the inspection result normal? 

      YES: GO TO 5.

      NO: Repair or replace harness as necessary.

  5. CHECK FRONT AIR CONTROL FOR 5 VOLT REFERENCE (VREF), VREF RETURN, AND FEEDBACK SIGNAL
    1. Reconnect front air control harness connectors.
    2. Turn ignition switch ON.
    3. Check voltage between front air control harness connector M52 terminal 23 and terminal 26.
      Connector Terminal Connector Terminal Voltage (Approx.)
      (+) (-)
      M52 23 M52 26 5V
    4. Check voltage between front air control harness connector M52 terminal 22 and ground.
      Connector Terminal - Voltage (Approx.)
      M52 22 Ground 0V

      Is the inspection result normal? 

      YES: GO TO 6.

      NO: Replace front air control. Refer to "REMOVAL AND INSTALLATION ".

  6. CHECK FRONT AIR CONTROL FOR FEEDBACK SIGNAL
    1. Reconnect the air mix door motor harness connector M149.
    2. Check voltage between front air control harness connector M52 terminal 22 and ground.
      Connector Terminal - Voltage (Approx.)
      M52 22 Ground 0.2 to 4.8V

      Is the inspection result normal? 

      YES: Inspect air mix door for binding or mechanical failure. If air mix door moves freely, replace front air control. Refer to "REMOVAL AND INSTALLATION ".

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

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