Nissan Sentra manuals

Nissan Sentra B18 (2020-2025) Service Manual: Diagnosis Procedure

Nissan Sentra B18 (2020-2025) Service Manual / Body Interior / Seat :: Dtc/circuit Diagnosis / Seat Heater Lh (back) / Diagnosis Procedure

Diagnosis Procedure

  1. CHECK CUSHION HEATER LH

    1. Check cushion heater LH.

      Refer to Component Function Check.

    Is the inspection result normal?

    YES>>

    GO TO 2.

    NO>>

    Refer to Diagnosis Procedure.

  2. CHECK SEAT HEATER LH (BACK) POWER SUPPLY

      1. Disconnect seat heater LH (back) connector.

      2. Ignition switch ON.

      3. Check voltage between seat heater LH (back) harness connector and ground.

        With power seat

        (+)

        (–)

        Condition

        Voltage

        (Approx.)

        Seat heater LH (back)

        Connector

        Terminal

        B238

        2

        Ground

        Heated seat switch LH (HIGH)

        ON

        Battery voltage

        Other than above

        0 V

        Heated seat switch LH (LOW)

        ON

        Battery voltage

        Other than above

        0 V
        With manual seat

        (+)

        (–)

        Condition

        Voltage

        (Approx.)

        Seat heater LH (back)

        Connector

        Terminal

        B230

        1

        Ground

        Heated seat switch LH (HIGH)

        ON

        Battery voltage

        Other than above

        0 V

        Heated seat switch LH (LOW)

        ON

        Battery voltage

        Other than above

        0 V

    Is the inspection result normal?

    YES>>

    GO TO 4.

    NO (with power seat)>>

    GO TO 3.

    NO (with manual seat)>>

    Replace front seat heater LH. Refer to Exploded View.

  3. CHECK SEAT HEATER LH (BACK) CIRCUIT

      1. Turn heated seat switch OFF.

      2. Ignition switch OFF.

      3. Disconnect front seat cushion heater LH connector.

      4. Check continuity between seat heater LH (back) harness connector and front seat cushion heater LH harness connector.

        Seat heater LH (back)

        Front seat cushion heater LH

        Continuity

        Connector

        Terminal

        Connector

        Terminal

        B238

        2

        B216

        4

        Yes

      5. Check continuity between seat heater LH (back) harness connector and ground.

        Seat heater LH (back)

        —

        Continuity

        Connector

        Terminal

        B238

        2

        Ground

        No

    Is the inspection result normal?

    YES>>

    Replace front seat cushion heater LH. Refer to Exploded View.

    NO>>

    Repair or replace harness.

  4. CHECK SEAT HEATER LH (BACK) GROUND CIRCUIT

      1. Turn heated seat switch OFF.

      2. Ignition switch OFF.

      3. Check continuity between seat heater LH (back) harness connector and ground.

        With power seat

        Seat heater LH (back)

        (–)

        Continuity

        Connector

        Terminal

        B238

        1

        Ground

        Yes
        With manual seat

        Seat heater LH (back)

        (–)

        Continuity

        Connector

        Terminal

        B230

        2

        Ground

        Yes

    Is the inspection result normal?

    YES >>

    Replace seat heater LH (back). Refer to Exploded View.

    NO >>

    Repair or replace harness.

Component Function Check
Component Function Check CHECK FUNCTION Check that the seat heater LH (back) warms to the preset temperature when operating the heated seat swit ...

Seat Heater Rh (back)
...

Other materials:

Disassembly and Assembly - Seat Cushion
Disassembly and Assembly - Seat Cushion 1. Seat cushion trim 2. Seat cushion pad ...

Precaution
Precaution for supplemental restraint system (srs) "air bag" and "seat belt pre-tensioner" The supplemental restraint system such as “air bag” and “seat belt pre-tensioner”, used along with a front seat belt, helps to reduce the risk or severity of injur ...

P0132 A/F SENSOR 1
DTC Logic DTC DETECTION LOGIC To judge the malfunction, the diagnosis checks that the A/F signal computed by ECM from the A/F sensor 1 signal is not inordinately high. DTC No. CONSULT screen terms (Trouble diagnosis content) DTC detecting condition Possible cause P0 ...

© 2014-2026 Copyright www.nisentra.com