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Nissan Sentra B18 (2020-2025) Service Manual: Cushion Heater Lh

Component Function Check

Component Function Check

  1. CHECK FUNCTION

    1. Check that cushion heater LH warms to the preset temperature when operating the heated seat switch LH to HIGH and LOW.

    Is the inspection result normal?

    YES>>

    Cushion heater LH function is OK.

    NO>>

    Refer to Diagnosis Procedure.

Diagnosis Procedure

Diagnosis Procedure

  1. CHECK CUSHION HEATER LH POWER SUPPLY

      1. Ignition switch ON.

      2. Check voltage between front seat cushion heater LH (with power seat) or front seat heater LH (with manual seat) and ground.

        With power seat

        (+)

        (–)

        Condition

        Voltage

        (Approx.)

        Front seat cushion heater LH

        Connector

        Terminal

        B216

        3

        Ground

        Heated seat switch LH (HIGH)

        ON

        Battery voltage

        Other than above

        0 V

        2

        Heated seat switch LH (LOW)

        ON

        Battery voltage

        Other than above

        0 V
        With manual seat

        (+)

        (–)

        Condition

        Voltage

        (Approx.)

        Front seat heater LH

        Connector

        Terminal

        B16

        3

        Ground

        Heated seat switch LH (HIGH)

        ON

        Battery voltage

        Other than above

        0 V

        4

        Heated seat switch LH (LOW)

        ON

        Battery voltage

        Other than above

        0 V

    Is the inspection result normal?

    YES >>

    GO TO 3.

    NO >>

    GO TO 2.

  2. CHECK CUSHION HEATER LH CIRCUIT

      1. Turn heated seat switch OFF.

      2. Ignition switch OFF.

      3. Disconnect front seat cushion heater LH connector (with power seat), front seat heater LH connector (with manual seat), heated seat LH low relay connector and heated seat LH high relay connector.

      4. Check continuity between front seat cushion heater LH harness connector (with power seat), front seat heater LH harness connector (with manual seat), heated seat LH low relay harness connector and heated seat LH high relay harness connector.

        With power seat

        Front seat cushion heater LH

        Heated seat LH relay

        Continuity

        Connector

        Terminal

        Connector

        Terminal

        B216

        3

        High

        M150

        3

        Yes

        2

        Low

        M6
        With manual seat

        Front seat heater LH

        Heated seat LH relay

        Continuity

        Connector

        Terminal

        Connector

        Terminal

        B16

        3

        High

        M150

        3

        Yes

        4

        Low

        M6

      5. Check continuity between front seat cushion heater LH harness connector (with power seat) or front seat heater LH harness connector (with manual seat) and ground.

        With power seat

        Front seat cushion heater LH

        (–)

        Continuity

        Connector

        Terminal

        B216

        3

        Ground

        No

        2
        With manual seat

        Front seat heater LH

        (–)

        Continuity

        Connector

        Terminal

        B16

        3

        Ground

        No

        4

    Is the inspection result normal?

    YES >>

    Replace corresponding heated seat LH relay.

    NO >>

    Repair or replace harness.

  3. CHECK CUSHION HEATER LH GROUND CIRCUIT

      1. Ignition switch OFF.

      2. Disconnect front seat cushion heater LH connector (with power seat) or front seat heater LH connector (with manual seat).

      3. Check continuity between front seat cushion heater LH harness connector (with power seat) or front seat heater LH harness connector (with manual seat) and ground.

        With power seat

        Front seat cushion heater LH

        (–)

        Continuity

        Connector

        Terminal

        B216

        1

        Ground

        Yes
        With manual seat

        Front seat heater LH

        (–)

        Continuity

        Connector

        Terminal

        B16

        6

        Ground

        Yes

    Is the inspection result normal?

    YES>>

    Replace front seat cushion heater LH (with power seat) or front seat heater LH (with manual seat). Refer to Exploded View.

    NO>>

    Repair or replace harness.

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