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Nissan Sentra B18 (2020-2025) Service Manual: Power Supply and Ground Circuit

Av Control Unit

Diagnosis Procedure

Diagnosis Procedure

  1. CHECK FUSE

    1. Check that the following fuse is not blown:

      Terminal No.

      Signal name

      Fuse No.

      Capacity

      19

      Battery power supply

      40

      20 A

    Is the fuse blown?

    YES >>

    Replace the blown fuse after repairing the affected circuit.

    NO >>

    GO TO 2.

  2. CHECK POWER SUPPLY CIRCUIT

      1. Ignition switch OFF.

      2. Disconnect AV control unit connector.

      3. Check voltage between AV control unit connector and ground.

        AV control unit

        (—)

        Voltage

        (Approx.)

        (+)

        Connector

        Terminal

        M103

        19

        Ground

        Battery voltage

    Is the inspection result normal?

    YES>>

    GO TO 3.

    NO>>

    Repair or replace harness or connectors.

  3. CHECK GROUND CIRCUIT

    1. Check continuity between AV control unit connector and ground.

      AV control unit

      —

      Continuity

      Connector

      Terminal

      M103

      20

      Ground

      Yes

    Is the inspection result normal?

    YES >>

    Inspection End.

    NO >>

    Repair or replace harness or connectors.

Bose Speaker Amp

Diagnosis Procedure

Diagnosis Procedure

  1. CHECK FUSE

    1. Check that the following fuses are not blown:

      Terminal No.

      Signal name

      Fuse No.

      Capacity

      1

      Battery power supply

      38

      20 A

      19

      Ignition power supply

      48

      10 A

    Is the fuse blown?

    YES >>

    Replace the blown fuse after repairing the affected circuit.

    NO >>

    GO TO 2.

  2. CHECK POWER SUPPLY CIRCUIT

      1. Ignition switch OFF.

      2. Disconnect Bose speaker amp. connectors.

      3. Check voltage between Bose speaker amp. connectors and ground.

        Bose speaker amp.

        (—)

        Condition

        Voltage

        (Approx.)

        (+)

        Connector

        Terminal

        B96

        1

        Ground

        Ignition switch: OFF

        Battery voltage

        B95

        19

        Ignition switch: ON

    Is the inspection result normal?

    YES>>

    GO TO 3.

    NO>>

    Repair or replace harness or connectors.

  3. CHECK GROUND CIRCUIT

      1. Ignition switch OFF.

      2. Check continuity between Bose speaker amp. connector and ground.

        Bose speaker amp.

        —

        Continuity

        Connector

        Terminal

        B96

        5

        Ground

        Yes

    Is the inspection result normal?

    YES >>

    Inspection End.

    NO >>

    Repair or replace harness or connectors.

Front Auxiliary Input Jacks Control Unit

Diagnosis Procedure

Diagnosis Procedure

  1. CHECK FUSE

    1. Check that the following fuse is not blown:

      Terminal No.

      Signal name

      Fuse No.

      Capacity

      19

      Battery power supply

      40

      20 A

    Is the fuse blown?

    YES >>

    Replace the blown fuse after repairing the affected circuit.

    NO >>

    GO TO 2.

  2. CHECK POWER SUPPLY CIRCUIT

      1. Ignition switch OFF.

      2. Disconnect front auxiliary input jacks control unit connector.

      3. Check voltage between front auxiliary input jacks control unit connector and ground.

        Front auxiliary input jacks control unit

        (—)

        Voltage

        (Approx.)

        (+)

        Connector

        Terminal

        M116

        1

        Ground

        Battery voltage

    Is the inspection result normal?

    YES>>

    GO TO 3.

    NO>>

    Repair or replace harness or connectors.

  3. CHECK GROUND CIRCUIT

    1. Check continuity between front auxiliary input jacks control unit connector and ground.

      Front auxiliary input jacks control unit

      —

      Continuity

      Connector

      Terminal

      M116

      4

      Ground

      Yes

    Is the inspection result normal?

    YES >>

    Inspection End.

    NO >>

    Repair or replace harness or connectors.

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