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Home >> Infiniti >> 2024 >> QX55 Essential >> Repair and Diagnosis (Single Page) >> Accessories & Equipment >> Drivers Assistance Systems - ADAS >> Audio, Visual & Navigation System (DTC/Circuit Diagnosis) >> DTC/Circuit Diagnosis >> Multi Av (Av Control Unit) >> Power Supply And Ground Circuit >> Av Control Unit
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Av Control Unit

  1. CHECK FUSE 
    1. Check that the following fuses are not blown:
      Terminal No. Signal name Fuse No. Capacity
      17 Ignition power supply 55 5A
      19 Battery power supply 42 15A

    Are the fuses blown?

    YES>>

    Replace the blown fuse after repairing the affected circuit.

    NO>>

    GO TO 2.

  2. CHECK POWER SUPPLY CIRCUIT 
      1. Ignition switch OFF.
      2. Disconnect AV control unit connector.
      3. Check voltage between AV control unit connector and ground.
        AV control unit Ground Condition Voltage(Approx.)
        Connector Terminal
        M138 19 - Ignition switch: OFF Battery voltage
        17 Ignition switch: ON

    Is the inspection result normal?

    YES>>

    GO TO 3.

    NO>>

    Repair or replace harness or connectors.

  3. CHECK GROUND CIRCUIT 
      1. Ignition switch OFF.
      2. Check continuity between AV control unit connector and ground.
        AV control unit Ground Continuity
        Connector Terminal
        M138 20 Ground Yes

    Is the inspection result normal?

    YES>>

    Inspection End

    NO>>

    Repair or replace harness or connectors.