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Nissan Sentra B18 (2020-2025) Service Manual: Sonar 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).

      • Sonar control unit

      • 8CH CAN gateway

    Is the inspection result normal?

    YES >>

    GO TO 2.

    NO >>

    Repair the terminal and connector.

  2. CHECK HARNESS CONTINUITY (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

      5

      25

      Existed

      6

      26

      Existed

    Is the measurement value within the specification?

    YES >>

    GO TO 3.

    NO >>

    Repair the harness and repair the root cause (Nissan Sentra Vehicle CAN communication 2 circuit side).

  3. CHECK HARNESS FOR OPEN CIRCUIT

    1. Connect the connector of 8CH CAN gateway.

    2. Disconnect the connector of sonar control unit.

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

      Sonar control unit harness connector

      Resistance (Ω)

      Connector No.

      Terminal No.

      B87

      5

      6

      Approx. 54 – 66

    Is the measurement value within the specification?

    YES >>

    GO TO 4.

    NO >>

    Repair the sonar control unit branch line.

  4. CHECK POWER SUPPLY AND GROUND CIRCUIT

    Check the power supply and the ground circuit of the sonar control unit. Refer to Diagnosis Procedure.

    Is the inspection result normal?

    YES (Present error) >>

    Replace the sonar control unit. Refer to Removal and Installation.

    YES (Past error) >>

    Error was detected in the sonar control unit branch line.

    NO >>

    Repair the power supply and the ground circuit.

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