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Nissan Sentra B18 (2020-2025) Service Manual: B24f4-14 Steering Heater Relay

Dtc Description

DTC Description

DTC DETECTION LOGIC

DTC No.

CONSULT screen terms (Trouble diagnosis name)

DTC detection condition

B24F4-14

STEERING HEATER RELAY

(Steering heater relay)

Diagnosis

Heated steering wheel switch is ON

Signal (terminal)

Heated steering wheel relay control signal

Threshold

—

Diagnosis delay time

—

POSSIBLE CAUSE

  • Harness, fuse, or connectors

  • Heated steering wheel relay

  • A/C auto amp.

FAIL-SAFE

—

Dtc Confirmation Procedure

DTC Confirmation Procedure

  1. PERFORM DTC CONFIRMATION PROCEDURE

    1. CONSULT

      1. Ignition switch ON.

      2. Turn heated steering wheel ON.

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

    Is B24F4–14 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 any of the following fuse is not blown (open):

        Signal name

        Fuse No.

        Capacity

        Ignition 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 STEERING WHEEL RELAY POWER SUPPLY

      1. Disconnect heated steering wheel relay connector.

      2. Ignition switch ON.

      3. Check voltage between heated steering wheel relay harness connector and ground.

        (+)

        (-)

        Voltage

        (Approx.)

        Heated steering wheel relay

        Connector

        Terminal

        M75

        1

        Ground

        Battery voltage

    Is the inspection result normal?

    YES>>

    GO TO 3.

    NO>>

    Repair or replace harness.

  3. CHECK HEATED STEERING WHEEL RELAY

    1. Check heated steering wheel relay.

      Refer to Component Inspection.

    Is the inspection result normal?

    YES >>

    GO TO 4.

    NO >>

    Replace heated steering wheel relay.

  4. CHECK HEATED STEERING WHEEL RELAY CONTROL SIGNAL

      1. Ignition switch OFF.

      2. Connect heated steering wheel relay connector.

      3. Ignition switch ON.

      4. Check voltage between A/C auto amp. harness connector and ground.

        (+)

        (–)

        Condition

        Voltage

        (Approx.)

        A/C auto amp.

        Connector

        Terminal

        M34

        56

        Ground

        Heated steering wheel relay

        OFF

        Battery voltage

        ON

        0 - 0.5 V

    Is the inspection result normal?

    YES >>

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

    NO >>

    GO TO 5.

  5. CHECK HEATED STEERING WHEEL RELAY CONTROL SIGNAL CIRCUIT

      1. Ignition switch OFF.

      2. Disconnect A/C auto amp. connector and heated steering wheel relay connector.

      3. Check continuity between A/C auto amp. harness connector and heated steering wheel relay harness connector.

        A/C auto amp.

        Heated steering wheel relay

        Continuity

        Connector

        Terminal

        Connector

        Terminal

        M34

        56

        M75

        2

        Yes

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

        A/C auto amp.

        –

        Continuity

        Connector

        Terminal

        M34

        56

        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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