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Nissan Sentra B18 (2020-2025) Service Manual: B1328 External Microphone 1

Dtc Description

DTC Description

DTC DETECTION LOGIC

DTC No.

CONSULT screen terms

(Trouble diagnosis content)

DTC detection condition

B1328–13

External Microphone 1

(Microphone)

[OPEN]

Diagnosis condition

When ignition switch is ON.

Signal (terminal)

—

Threshold

–

Diagnosis delay time

30 seconds or more

B1328–11

[GND–SHORT]

Diagnosis condition

When ignition switch is ON.

Signal (terminal)

—

Threshold

–

Diagnosis delay time

30 seconds or more

B1328–12

[VB–SHOR]

Diagnosis condition

When ignition switch is ON.

Signal (terminal)

—

Threshold

–

Diagnosis delay time

30 seconds or more

POSSIBLE CAUSE

  • Microphone is not connected

  • Harness or connector

  • Microphone

FAIL-SAFE

Microphone is inoperative

Dtc Confirmation Procedure

DTC Confirmation Procedure

  1. PERFORM DTC CONFIRMATION PROCEDURE

    1. CONSULT

      1. Ignition switch ON.

      2. Ignition switch OFF and wait at least 30 seconds.

      3. Ignition switch ON and wait at least 30 seconds or more.

      4. Select “Self Diagnostic Result” mode of “MULTI AV”.

      5. Check DTC.

    Is DTC B1328 detected?

    YES>>

    Proceed to DTC Diagnosis Procedure.

    NO>>

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

    NO>>

    Confirmation after repair: Inspection End.

Diagnosis Procedure

Diagnosis Procedure

  1. DETERMINE MALFUNCTION TYPE

    1. CONSULT

      1. Ignition switch ON.

      2. Ignition switch OFF and wait at least 30 seconds.

      3. Ignition switch ON and wait at least 30 seconds or more.

      4. Select “Self Diagnostic Result” mode of “MULTI AV”.

      5. Check DTC.

    Is DTC B1328–11, 12 or 13 detected?

    YES>>

    13 [OPEN], or 11 [GND-SHORT] – GO TO 2.

    YES>>

    12 [VB–SHOR] – GO TO 3.

    NO>>

    Refer to Intermittent Incident.

  2. CHECK MICROPHONE CIRCUITS FOR OPEN OR SHORT TO GROUND

      1. Ignition switch OFF.

      2. Disconnect AV control unit connector and microphone connector.

      3. Check the continuity between AV control unit connector and microphone connector.

        AV control unit

        Microphone

        Continuity

        Connector

        Terminal

        Connector

        Terminal

        M104

        21

        R17

        1

        Yes

        22

        4

        42

        2

        50

        5

      4. Check the continuity between AV control unit connector and ground.

        AV control unit

        —

        Continuity

        Connector

        Terminal

        M104

        21

        Ground

        Yes

        22

        50

    Is the inspection result normal?

    YES >>

    Replace microphone. Refer to Removal and Installation.

    NO >>

    Repair or replace harness or connectors.

  3. CHECK MICROPHONE CIRCUITS FOR SHORT TO POWER SUPPLY

      1. Ignition switch OFF.

      2. Disconnect AV control unit connector and microphone connector.

      3. Ignition switch ON.

      4. Check the voltage between AV control unit connector and ground.

        AV control unit

        (−)

        Voltage

        (Approx.)

        (+)

        Connector

        Terminal

        M104

        21

        Ground

        0 V

        22

        42

        50

    Is the inspection result normal?

    YES >>

    Replace microphone. Refer to Removal and Installation.

    NO >>

    Repair or replace harness or connectors.

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