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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 via A/C switch assembly to 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 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 amp. connector.

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

        A/C switch assembly

        A/C amp.

        Continuity

        Connector

        Terminal

        Connector

        Terminal

        M59

        8

        M82

        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 amp. Refer to Removal and Installation.

    NO >>

    Repair harness or connector.

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