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Home >> Infiniti >> 2022 >> QX55 Essential >> Repair and Diagnosis >> Electrical >> Gauges >> Meter, Warning Lamp & Indicator (DTC/Circuit Diagnosis) >> DTC/Circuit Diagnosis >> Power Supply And Ground Circuit >> Diagnosis Procedure

Diagnosis Procedure

  1. CHECK FUSES 

    Check that the following fuses are not blown:

    Unit

    Power source

    Fuse No.

    Capacity

    Combination meter

    Battery

    39

    10 A

    Ignition switch ON or START

    50

    5 A

    Is the fuse blown?

    YES

    Replace the blown fuse after repairing the affected circuit.

    NO

    GO TO 2.

  2. CHECK POWER SUPPLY CIRCUIT 
    1. Disconnect combination meter harness connector.
    2. Check voltage between combination meter harness connector and ground.

      (+)

      (-)

      Ignition switch position

      Combination meter

      Connector

      Terminal

      OFF

      ON

      START

      M76

      21

      Ground

      Battery voltage

      Battery voltage

      Battery voltage

      2

      0V

      Battery voltage

      Battery voltage

    Is the inspection result normal?

    YES

    GO TO 3.

    NO

    Repair or replace harness or connector.

  3. CHECK GROUND CIRCUIT 
    1. Ignition switch OFF.
    2. Check continuity between combination meter harness connector and ground.

      Combination meter

      --

      Continuity

      Connector

      Terminal

      M76

      1

      Ground

      Yes

      M77

      41

    Is the inspection result normal?

    YES

    Inspection End.

    NO

    Repair or replace harness or connector.