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Home >> Infiniti >> 2024 >> QX55 Essential >> Repair and Diagnosis >> Accessories & Equipment >> Communication Devices >> Can System (DTC/Circuit Diagnosis) >> Circuit Diagnosis >> ANC 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 terminals and connectors of the active noise control unit for damage, bend and loose connection (unit side and connector side).

    Is the inspection result normal?

    >>

    GO TO 2.

    >>

    Repair the terminal and connector.

  2. CHECK HARNESS FOR OPEN CIRCUIT 
    1. Disconnect the connector of active noise control unit.
    2. Check the resistance between the active noise control unit harness connector terminals.
      Active noise control unit harness connector Resistance (Ω)
      Connector No. Terminal No.
      M87 18 2 Approx. 54 - 66

    Is the measurement value within the specification?

    >>

    GO TO 3.

    >>

    Repair the active noise control unit branch line.

  3. CHECK POWER SUPPLY AND GROUND CIRCUIT 

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

    Is the inspection result normal?

    >>

    Replace the active noise control unit. Refer to Removal and Installation .

    >>

    Error was detected in the active noise control unit branch line.

    >>

    Repair the power supply and the ground circuit.

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