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Nissan Sentra B18 (2020-2025) Service Manual: Av Branch Line Circuit

Diagnosis Procedure

Diagnosis Procedure

  1. CHECK CONNECTOR

    1. Turn the ignition switch OFF.

    2. Disconnect the battery cable from the negative terminal.

    3. Check the following terminals and connectors for damage, bend and loose connection (unit side and connector side).

      • 8CH CAN gateway

      • AV control unit

    Is the inspection result normal?

    YES >>

    GO TO 2.

    NO >>

    Repair the terminal and connector.

  2. CHECK HARNESS FOR OPEN CIRCUIT

    1. Disconnect the connector of 8CH CAN gateway.

    2. Check the resistance between the 8CH CAN gateway harness connector terminals.

      8CH CAN gateway harness connector

      Continuity

      Connector No.

      Terminal No.

      M37

      11

      27

      Existed

      12

      28

      Existed

    Is the measurement value within the specification?

    YES >>

    GO TO 3.

    NO >>

    Repair the harness and repair the root cause (IT CAN communication circuit side).

  3. CHECK HARNESS FOR OPEN CIRCUIT

    1. Connect the connector of 8CH CAN gateway.

    2. Disconnect the connector of AV control unit.

    3. Check the resistance between the AV control unit harness connector terminals.

      • With display audio with 7" color display

        AV control unit harness connector

        Resistance (Ω)

        Connector No.

        Terminal No.

        M92

        8

        17

        Approx. 54 – 66

      • With display audio with 8" color display

        AV control unit harness connector

        Resistance (Ω)

        Connector No.

        Terminal No.

        M104

        40

        60

        Approx. 54 – 66

    Is the measurement value within the specification?

    YES >>

    GO TO 4.

    NO >>

    Repair the AV control unit branch line.

  4. CHECK POWER SUPPLY AND GROUND CIRCUIT

    Check the power supply and the ground circuit of the AV control unit. Refer to the following.

    • Display audio with 7" color display: Diagnosis Procedure

    • Display audio without BOSE with 8" color display: Diagnosis Procedure

    • Display audio with BOSE with 8" color display: Diagnosis Procedure

    Is the inspection result normal?

    YES (Present error) >>

    Replace the AV control unit. Refer to the following.

    • Display audio with 7" color display: Removal and Installation

    • Display audio without BOSE with 8" color display: Removal and Installation

    • Display audio with BOSE with 8" color display: Removal and Installation

    YES (Past error) >>

    Error was detected in the AV control unit branch line.

    NO >>

    Repair the power supply and the ground circuit.

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