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HOMESERVICE MANUALSINFINITI2019Q70 3.7 LUXE, AWDREPAIR AND DIAGNOSIS (SINGLE PAGE)ACCESSORIES & EQUIPMENTENTERTAINMENT SYSTEMSAUDIO, VISUAL & NAVIGATION SYSTEM (INFINITI INTOUCH) (DTC/CIRCUIT DIAGNOSIS)DTC/CIRCUIT DIAGNOSISPOWER SUPPLY AND GROUND CIRCUITAV CONTROL UNITDIAGNOSIS PROCEDURE
2019 Infiniti Q70 3.7 Luxe, AWD

Diagnosis Procedure

2019 Infiniti Q70 3.7 Luxe, AWDSECTION Diagnosis Procedure
  1. CHECK FUSE 
    1. Turn ignition switch OFF.
    2. Check that the following fuse is not blown (open).

      Power source

      Fuse No.

      Capacity

      Battery

      #34

      15 A

    Is the fuse blown (open)?

    YES

    Replace fuse after repairing the applicable circuit.

    NO

    GO TO 2.

  2. CHECK AV CONTROL UNIT BATTERY POWER SUPPLY 

    Check the voltage between AV control unit harness connector and ground.

    (+)

    (-)

    Reference value

    AV control unit

    Connector

    Terminal

    M126

    19

    Ground

    Battery voltage

    Is the inspection result normal?

    YES

    GO TO 3.

    NO

    Perform trouble diagnosis for battery power supply circuit.

  3. CHECK AV CONTROL UNIT ACCESSORY POWER SUPPLY 
    1. Turn ignition switch ON.
    2. Check the voltage between AV control unit harness connector and ground.

      (+)

      (-)

      Reference value

      AV control unit

      Connector

      Terminal

      M126

      7

      Ground

      Battery voltage

    Is the inspection result normal?

    YES

    GO TO 4.

    NO

    Perform trouble diagnosis for accessory power supply circuit.

  4. CHECK GROUND CIRCUIT 
    1. Turn ignition switch OFF.
    2. Disconnect AV control unit connector.
    3. Check the continuity between AV control unit harness connector and ground.

      (+)

      (-)

      Continuity

      AV control unit

      Connector

      Terminal

      M126

      20

      Ground

      Existed

    Is the inspection result normal?

    YES

    INSPECTION END

    NO

    Repair or replace harness or connector.

RENDER: 1.0x

NO RELATED

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • • You smell fuel, burning insulation, or see smoke.
  • • Brakes feel soft, pull hard to one side, or make grinding noises.
  • • The engine overheats, stalls repeatedly, or misfires under load.
  • • You are missing required tools, torque specs, or safe lifting equipment.
  • • You are not confident in the next step or safety outcome.