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Nissan Sentra B18 (2020-2025) Service Manual: Mode Door Motor

Diagnosis Procedure

Diagnosis Procedure

  1. CHECK MODE DOOR MOTOR POWER SUPPLY

      1. Ignition switch ON.

      2. Check voltage between mode door motor harness connector and ground.

        +

        –

        Voltage

        (Approx.)

        Mode door motor

        Connector

        Terminal

        M166

        1

        Ground

        Battery voltage

    Is the inspection result normal?

    YES >>

    GO TO 2.

    NO >>

    GO TO 5.

  2. CHECK MODE DOOR MOTOR GROUND CIRCUIT

      1. Ignition switch OFF.

      2. Disconnect mode door motor connector and A/C amp. connector.

      3. Check continuity between mode door motor harness connector and ground.

        Mode door motor

        —

        Continuity

        Connector

        Terminal

        M166

        2

        Ground

        Yes

    Is the inspection result normal?

    YES >>

    GO TO 3.

    NO >>

    Repair harness or connector.

  3. CHECK MODE DOOR MOTOR LIN SIGNAL

      1. Connect mode door motor connector and A/C amp. connector.

      2. Ignition switch ON.

      3. Confirm output waveform between mode door motor harness connector and ground using oscilloscope.

        +

        —

        Output waveform

        Mode door motor

        Connector

        Terminal

        M166

        3

        Ground

    Is the inspection result normal?

    YES >>

    GO TO 4.

    NO >>

    GO TO 6.

  4. CHECK INSTALLATION OF MODE DOOR MOTOR

    1. Check mode door motor is properly installed. Refer to Exploded View.

    Is the inspection result normal?

    YES >>

    Replace mode door motor. Refer to Removal and Installation.

    NO >>

    Repair or replace malfunctioning part.

  5. CHECK MODE DOOR MOTOR POWER SUPPLY CIRCUIT FOR OPEN

      1. Ignition switch OFF.

      2. Disconnect mode door motor connector and A/C amp. connector.

      3. Check continuity between mode door motor harness connector and A/C amp. connector.

        Mode door motor

        A/C amp.

        Continuity

        Connector

        Terminal

        Connector

        Terminal

        M166

        1

        M81

        1

        Yes

    Is the inspection result normal?

    YES >>

    Replace A/C amp. Refer to Removal and Installation.

    NO >>

    Repair harness or connector.

  6. CHECK MODE DOOR MOTOR LIN SIGNAL CIRCUIT FOR OPEN

      1. Ignition switch OFF.

      2. Disconnect mode door motor connector and A/C amp. connector.

      3. Check continuity between mode door motor harness connector and A/C amp. harness connector.

        Mode door motor

        A/C amp.

        Continuity

        Connector

        Terminal

        Connector

        Terminal

        M166

        3

        M81

        22

        Yes

    Is the inspection result normal?

    YES >>

    Replace A/C amp. Refer to Removal and Installation.

    NO >>

    Repair harness or connector.

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