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Home >> Infiniti >> 2015 >> QX80 Base, AWD >> Repair and Diagnosis >> Accessories & Equipment >> Infotainment >> Audio, Visual & Navigation System (BOSE Audio With Navigation) (Diagnostic Trouble Codes (DTCS) U1207-B272C, Symptom Tests And R & I) >> DTC/Circuit Diagnosis >> Power Supply And Ground Circuit >> Front Display Unit >> Diagnosis Procedure

Diagnosis Procedure

  1. CHECK FUSE

    Check for blown fuses.

    Power source Fuse No.
    Battery 35
    Ignition switch ACC or ON 19

    Is the inspection result normal?

    YES 

    GO TO STEP 2  .

    NO 

    Be sure to eliminate cause of malfunction before installing new fuse.

  2. CHECK BATTERY POWER SUPPLY CIRCUIT

    Check voltage between display unit harness connector and ground.

    Signal name (+) (-) Ignition switch position Voltage
    (Approx.)
    Display unit
    Connector Terminal
    Battery power supply M215 11 Ground OFF Battery voltage

    Is the inspection result normal?

    YES 

    GO TO STEP 3  .

    NO 

    Be sure to eliminate cause of malfunction before installing new fuse.

  3. CHECK ACC POWER SUPPLY CIRCUIT

    Check voltage between display unit harness connectors and ground.

    Signal name (+) (-) Ignition switch position Voltage
    (Approx.)
    Display unit
    Connector Terminal
    ACC power supply M215 23 Ground ACC Battery voltage

    Is the inspection result normal?

    YES 

    GO TO STEP 4  .

    NO 

    • Check harness between display unit and BCM/fuse.
      NOTE:

      ACC power supply circuit varies according to specifications.

  4. CHECK GROUND CIRCUIT

    1. Turn ignition switch OFF.
    2. Disconnect display unit connector.
    3. Check continuity between display unit harness connectors and ground.
      Display unit Ground Continuity
      Connector Terminal
      M215 12 Existed

    Is the inspection result normal?

    YES 

    INSPECTION END

    NO 

    Repair harness or connector.

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