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Nissan Sentra B18 (2020-2025) Service Manual: B24b0-14 Front Heated Seat Relay Lh (hi)

Dtc Description

DTC Description

DTC DETECTION LOGIC

DTC No.

CONSULT screen terms

(Trouble diagnosis name)

DTC detection condition

B24B0-14

Front heated seat relay LH (HI)

[Front heated seat relay left hand (high)]

Diagnosis

Heated seat switch LH (HIGH) is OFF

Signal (terminal)

Heated seat LH high relay control signal

Threshold

Less than 2.5 V

Diagnosis delay time

1 second or more

POSSIBLE CAUSE

  • Harness, fuse, or connectors

  • Heated seat LH high relay

  • A/C auto amp. (with auto A/C)

  • A/C amp. (with manual A/C)

FAIL-SAFE

—

Dtc Confirmation Procedure

DTC Confirmation Procedure

  1. PERFORM DTC CONFIRMATION PROCEDURE

    1. CONSULT

      1. Ignition switch ON.

      2. Turn heated seat switch LH (HIGH) ON.

      3. Select “Self Diagnostic Result” mode of “HVAC”.

    Is B24B0-14 detected?

    YES >>

    Refer to DTC Diagnosis Procedure.

    NO >>

    To check malfunction symptom before repair: Refer to Intermittent Incident.

    NO >>

    Confirmation after repair: Inspection End.

Dtc Diagnosis Procedure

DTC Diagnosis Procedure

  1. CHECK FUSE

      1. Ignition switch OFF.

      2. Check that the following fuse is not blown (open):

        Signal name

        Fuse No.

        Capacity

        Ignition switch ON power supply

        6

        10 A

    Is the inspection result normal?

    YES >>

    GO TO 2

    NO >>

    Replace the blown fuse after repairing the affected circuit.

  2. CHECK HEATED SEAT LH HIGH RELAY POWER SUPPLY

      1. Disconnect heated seat LH high relay connector.

      2. Ignition switch ON.

      3. Check voltage between heated seat LH high relay harness connector and ground.

        (+)

        (-)

        Voltage

        (Approx.)

        Heated seat LH high relay

        Connector

        Terminal

        M150

        1

        Ground

        Battery voltage

    Is the inspection result normal?

    YES >>

    GO TO 3.

    NO >>

    Repair or replace harness.

  3. CHECK HEATED SEAT LH HIGH RELAY

    1. Check heated seat LH high relay.

      Refer to Component Inspection.

    Is the inspection result normal?

    YES >>

    GO TO 4.

    NO >>

    Replace heated seat LH high relay.

  4. CHECK HEATED SEAT LH HIGH RELAY CONTROL SIGNAL

      1. Connect heated seat LH high relay connector.

      2. Check voltage between A/C auto amp. (with auto A/C) or A/C amp. (with manual A/C) harness connector and ground.

        With auto A/C

        (+)

        (–)

        Condition

        Voltage

        (Approx.)

        A/C auto amp.

        Connector

        Terminal

        M34

        55

        Ground

        Heated seat switch LH (HIGH)

        OFF

        Battery voltage

        ON

        0 V
        With manual A/C

        (+)

        (–)

        Condition

        Voltage

        (Approx.)

        A/C amp.

        Connector

        Terminal

        M82

        55

        Ground

        Heated seat switch LH (HIGH)

        OFF

        Battery voltage

        ON

        0 V

    Is the inspection result normal?

    YES >>

    Replace A/C auto amp. (with auto A/C) or A/C amp. (with manual A/C). Refer to Removal and Installation (with auto A/C) or Removal and Installation (with manual A/C).

    NO >>

    GO TO 5.

  5. CHECK HEATED SEAT LH HIGH RELAY CONTROL SIGNAL CIRCUIT

      1. Ignition switch OFF.

      2. Disconnect A/C auto amp. connector (with auto A/C) or A/C. amp. connector (with manual A/C) and heated seat LH high relay connector.

      3. Check continuity between A/C auto amp. harness connector (with auto A/C) or A/C. amp. harness connector (with manual A/C) and heated seat LH high relay harness connector.

        With auto A/C

        A/C auto amp.

        Heated seat LH high relay

        Continuity

        Connector

        Terminal

        Connector

        Terminal

        M34

        55

        M150

        2

        Yes
        With manual A/C

        A/C amp.

        Heated seat LH high relay

        Continuity

        Connector

        Terminal

        Connector

        Terminal

        M82

        55

        M150

        2

        Yes

      4. Check continuity between A/C auto amp. harness connector (with auto A/C) or A/C amp. harness connector (with manual A/C) and ground.

        With auto A/C

        A/C auto amp.

        (–)

        Continuity

        Connector

        Terminal

        M34

        55

        Ground

        No
        With manual A/C

        A/C amp.

        (–)

        Continuity

        Connector

        Terminal

        M82

        55

        Ground

        No

    Is the inspection result normal?

    YES >>

    GO TO 6.

    NO >>

    Repair or replace harness.

  6. CHECK INTERMITTENT INCIDENT

    1. Check intermittent incident.

      Refer to Intermittent Incident.

    >>

    Inspection End.

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