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Home >> Nissan-Datsun >> 2021 >> NV2500 HD S >> Repair and Diagnosis >> External Pages >> Different car >> Section 543 (Heater & Air Conditioning Control System (DTC/Circuit Diagnosis)) >> DTC/Circuit Diagnosis >> Rear Air Mix Door Motor >> DTC Diagnosis Procedure

DTC Diagnosis Procedure

WARNING: This page is about a different car, the 2019 Nissan NV3500 HD, 2019 Nissan NV2500 HD, and 2019 Nissan NV1500. However, it is still accessible from the selected car via links, so may be relevant.
  1. CHECK REAR AIR MIX DOOR MOTOR POWER SUPPLY 
    1. Turn ignition switch ON.
    2. Check voltage between rear air mix door motor harness connector and ground.

    +

    -

    Voltage

    (Approx.)

    Rear air mix door motor

    Connector

    Terminal

    B202

    1

    Ground

    Battery voltage

    Is the inspection result normal?

    YES

    GO TO 2.

    NO

    GO TO 5.

  2. CHECK REAR AIR MIX DOOR MOTOR GROUND CIRCUIT FOR OPEN 
    1. Turn ignition switch OFF.
    2. Disconnect rear air mix door motor connector.
    3. Check continuity between rear air mix door motor harness connector and ground.

      Rear air mix door motor

      --

      Continuity

      Connector

      Terminal

      B202

      2

      Ground

      Yes

    Is the inspection result normal?

    YES

    GO TO 3.

    NO

    Repair harness or connector.

  3. CHECK REAR AIR MIX DOOR MOTOR LAN SIGNAL 
    1. Connect rear air mix door motor connector.
    2. Turn ignition switch ON.
    3. Confirm output waveform between rear air mix door motor harness connector and ground using oscilloscope.

      +

      -

      Output waveform

      Rear air mix door motor

      Connector

      Terminal

      B202

      3

      Ground
      G04077879Courtesy of NISSAN NORTH AMERICA, INC.

    Is the inspection result normal?

    YES

    GO TO 4.

    NO

    GO TO 6.

  4. CHECK INSTALLATION OF REAR AIR MIX DOOR MOTOR 

    Check rear air mix door motor is properly installed.

    Is the inspection result normal?

    YES

    Replace rear air mix door motor. Refer to Removal and Installation - Rear Air Mix Door Motor .

    NO

    Repair or replace malfunctioning part.

  5. CHECK REAR AIR MIX DOOR MOTOR POWER SUPPLY CIRCUIT FOR OPEN 
    1. Turn ignition switch OFF.
    2. Disconnect rear air mix door motor and front air control connector.
    3. Check continuity between rear air mix door motor harness connector and front air control connector.

      Rear air mix door motor

      Front air control

      Continuity

      Connector

      Terminal

      Connector

      Terminal

      B202

      1

      M53

      5

      Yes

    Is the inspection result normal?

    YES

    Replace front air control. Refer to Removal and Installation - Front Air Control .

    NO

    Repair harness or connector.

  6. CHECK REAR AIR MIX DOOR MOTOR LAN SIGNAL CIRCUIT FOR OPEN 
    1. Turn ignition switch OFF.
    2. Disconnect rear air mix door motor and front air control connector.
    3. Check continuity between rear air mix door motor harness connector and front air control connector.

      Rear air mix door motor

      Front air control

      Continuity

      Connector

      Terminal

      Connector

      Terminal

      B202

      3

      M53

      6

      Yes

    Is the inspection result normal?

    YES

    Replace front air control. Refer to Removal and Installation - Front Air Control .

    NO

    Repair harness or connector.

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