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Home >> Infiniti >> 2024 >> QX55 Essential >> Repair and Diagnosis >> Accessories & Equipment >> Communication Devices >> Can System (DTC/Circuit Diagnosis) >> Circuit Diagnosis >> M 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 combination meter 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 combination meter.
    2. Check the resistance between the combination meter harness connector terminals.
      Combination meter harness connector Resistance (Ω)
      Connector No. Terminal No.
      M76 40 39 Approx. 54 - 66

    Is the measurement value within the specification?

    >>

    GO TO 3.

    >>

    Repair the combination meter branch line.

  3. CHECK POWER SUPPLY AND GROUND CIRCUIT 

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

    Is the inspection result normal?

    >>

    Replace the combination meter. Refer to Removal and Installation .

    >>

    Error was detected in the combination meter branch line.

    >>

    Repair the power supply and the ground circuit.

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