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

Diagnosis Procedure

Diagnosis Procedure

Note:

If all of door motor DTCs are detected, check this circuit.

  1. CHECK DOOR MOTOR POWER SUPPLY

      1. Ignition switch ON.

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

        +

        –

        Voltage

        (Approx.)

        Intake door motor

        Connector

        Terminal

        M165

        1

        Ground

        Battery voltage

    Is the inspection result normal?

    YES >>

    GO TO 2.

    NO >>

    GO TO 7.

  2. CHECK DOOR MOTOR GROUND CIRCUIT FOR OPEN

      1. Ignition switch OFF.

      2. Disconnect intake door motor connector.

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

        Intake door motor

        —

        Continuity

        Connector

        Terminal

        M165

        2

        Ground

        Yes

    Is the inspection result normal?

    YES >>

    GO TO 3.

    NO >>

    Repair harness or connector.

  3. CHECK DOOR MOTOR LIN SIGNAL

      1. Connect intake door motor connector.

      2. Ignition switch ON.

      3. Confirm output waveform between intake door motor harness connector and ground with oscilloscope.

        +

        –

        Output waveform

        Intake door motor

        Connector

        Terminal

        M165

        3

        Ground

    Is the inspection result normal?

    YES >>

    GO TO 4.

    NO >>

    GO TO 6.

  4. CHECK DOOR MOTOR LIN SIGNAL CIRCUIT FOR OPEN

      1. Ignition switch OFF.

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

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

        A/C amp.

        Intake door motor

        Continuity

        Connector

        Terminal

        Connector

        Terminal

        M81

        22

        M165

        3

        Yes

    Is the inspection result normal?

    YES >>

    GO TO 5.

    NO >>

    Repair harness or connector.

  5. CHECK INTERMITTENT INCIDENT

    1. Check intermittent incident. Refer to Intermittent Incident.

    >>

    Inspection End.

  6. CHECK DOOR MOTOR LIN SIGNAL CIRCUIT FOR SHORT

      1. Ignition switch OFF.

      2. Disconnect following connectors:

        • A/C amp.

        • Air mix door motor

        • Mode door motor

        • Intake door motor

      3. Check continuity between A/C amp. harness connector and ground.

        A/C amp.

        —

        Continuity

        Connector

        Terminal

        M81

        22

        Ground

        No

    Is the inspection result normal?

    YES >>

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

    NO >>

    Repair harness or connector.

  7. CHECK DOOR MOTOR POWER SUPPLY CIRCUIT FOR OPEN

      1. Ignition switch OFF.

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

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

        Intake door motor

        A/C amp.

        Continuity

        Connector

        Terminal

        Connector

        Terminal

        M165

        1

        M81

        1

        Yes

    Is the inspection result normal?

    YES >>

    GO TO 8.

    NO >>

    Repair harness or connector.

  8. CHECK DOOR MOTOR POWER SUPPLY CIRCUIT FOR SHORT

      1. Disconnect following connectors:

        • Air mix door motor

        • Mode door motor

      2. Check continuity between A/C amp. harness connector and ground.

        A/C amp.

        —

        Continuity

        Connector

        Terminal

        M81

        1

        Ground

        No

    Is the inspection result normal?

    YES >>

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

    NO >>

    Repair harness or connector.

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