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Nissan Sentra B18 (2020-2025) Service Manual: B24d4-08 A/c Control Comm

Dtc Description

DTC Description

DTC DETECTION LOGIC

DTC No.

CONSULT screen terms

(Trouble diagnosis content)

DTC detection condition

B24D4-08

A/C CONTROL COMM

(A/C control communication)

Diagnosis condition

Ignition switch ON

Signal (Terminal)

LIN (A/C control) signal

Threshold

Receive internal circuit error message from A/C switch assembly via LIN communication

Diagnosis delay time

2 seconds or more

POSSIBLE CAUSE

  • Fuse

  • Harness and connector (A/C switch assembly circuit is open or shorted)

  • A/C switch assembly

  • A/C auto amp.

FAIL-SAFE

Confirmation Procedure

Confirmation Procedure

  1. PERFORM SELF DIAGNOSTIC RESULT

    1. CONSULT

      1. Ignition switch ON.

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

      3. Check DTC.

    Is DTC 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):

        Component

        Location

        Fuse No.

        Capacity

        A/C switch assembly

        Fuse block (J/B)

        6

        10 A

    Is the fuse blown (open)?

    YES >>

    Replace the blown (open) fuse after repairing the affected circuit if a fuse is blown (open).

    NO >>

    GO TO 2.

  2. CHECK A/C SWITCH ASSEMBLY POWER SUPPLY

      1. Disconnect A/C switch assembly connector.

      2. Ignition switch ON.

      3. Check voltage between A/C switch assembly harness connector and ground.

        +

        -

        Voltage

        (Approx.)

        A/C switch assembly

        Connector

        Terminal

        M59

        5

        Ground

        Battery voltage

    Is the inspection result normal?

    YES >>

    GO TO 3.

    NO >>

    Repair harness or connector between A/C switch assembly and fuse.

  3. CHECK A/C SWITCH ASSEMBLY GROUND CIRCUIT FOR OPEN

      1. Ignition switch OFF.

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

        A/C switch assembly

        Continuity

        Connector

        Terminal

        M59

        7

        Ground

        Yes

    Is the inspection result normal?

    YES >>

    GO TO 4.

    NO >>

    Repair harness or connector.

  4. CHECK A/C SWITCH ASSEMBLY LIN SIGNAL

      1. Connect A/C switch assembly connector.

      2. Ignition switch ON.

      3. Confirm output waveform between A/C switch assembly harness connector and ground with oscilloscope.

        +

        -

        Output waveform

        A/C switch assembly

        Connector

        Terminal

        M59

        8

        Ground

    Is the inspection result normal?

    YES >>

    Replace A/C switch assembly. Refer to Removal and Installation.

    NO >>

    GO TO 5.

  5. CHECK LIN COMMUNICATION SIGNAL CIRCUIT FOR OPEN

      1. Ignition switch OFF.

      2. Disconnect A/C switch assembly connector and A/C auto amp. connector.

      3. Check continuity between A/C switch assembly harness connector and A/C auto amp. harness connector.

        A/C switch assembly

        A/C auto amp.

        Continuity

        Connector

        Terminal

        Connector

        Terminal

        M59

        8

        M34

        68

        Yes

    Is the inspection result normal?

    YES >>

    GO TO 6.

    NO >>

    Repair harness or connector.

  6. CHECK LIN COMMUNICATION SIGNAL CIRCUIT FOR SHORT

      1. Check continuity between A/C switch assembly harness connector and ground.

        A/C switch assembly

        Continuity

        Connector

        Terminal

        M59

        8

        Ground

        No

      2. Check voltage between A/C switch assembly harness connector and ground.

        +

        -

        Voltage

        (Approx.)

        A/C switch assembly

        Connector

        Terminal

        M59

        8

        Ground

        0 V

    Is the inspection result normal?

    YES >>

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

    NO >>

    Repair harness or connector.

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