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Home >> Infiniti >> 2024 >> QX55 Essential >> Repair and Diagnosis >> Accessories & Equipment >> Communication Devices >> Can System (DTC/Circuit Diagnosis) >> Circuit Diagnosis >> BCM Branch Line Circuit (Vehicle Can Communication 1 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 BCM 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 BCM.
    2. Check the resistance between the BCM harness connector terminals.
      BCM harness connector Resistance (Ω)
      Connector No. Terminal No.
      M19 60 80 Approx. 108 - 132

    Is the measurement value within the specification?

    >>

    GO TO 3.

    >>

    Repair the BCM branch line.

  3. CHECK POWER SUPPLY AND GROUND CIRCUIT 

    Check the power supply and the ground circuit of the BCM. Refer to Diagnosis Procedure .

    Is the inspection result normal?

    >>

    Replace the BCM. Refer to Removal and Installation .

    >>

    Error was detected in the BCM branch line.

    >>

    Repair the power supply and the ground circuit.

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